diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index db5832c72..61d969cc5 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -51,6 +51,11 @@ jobs:
         env:
           DATABASE_URL: mysql2://user:password@127.0.0.1/test
           RAILS_ENV: test
+      - name: Apply plugin migrations
+        run: bundle exec rake foodsoft_invoices_engine:install:migrations db:migrate
+        env:
+          DATABASE_URL: mysql2://user:password@127.0.0.1/test
+          RAILS_ENV: test
       - name: Run tests
         run: bundle exec rake rspec-rerun:spec
         env:
diff --git a/Gemfile b/Gemfile
index b836540db..1c934fe7b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -79,6 +79,7 @@ gem 'foodsoft_wiki', path: 'plugins/wiki'
 # gem 'foodsoft_printer', path: 'plugins/printer'
 # gem 'foodsoft_uservoice', path: 'plugins/uservoice'
 # gem 'foodsoft_mollie', path: 'plugins/mollie'
+# gem 'foodsoft_invoices', path: 'plugins/invoices'
 
 group :development do
   gem 'listen'
@@ -131,4 +132,5 @@ group :test do
   gem 'rswag-specs'
   # plugins with tests deactivated by default
   gem 'foodsoft_b85', path: 'plugins/b85'
+  gem 'foodsoft_invoices', path: 'plugins/invoices'
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 94664b163..bd3a5f5ae 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,6 +35,15 @@ PATH
       rails
       ruby-filemagic
 
+PATH
+  remote: plugins/invoices
+  specs:
+    foodsoft_invoices (0.0.1)
+      deface (~> 1.0)
+      prawn
+      prawn-table
+      rails
+
 PATH
   remote: plugins/links
   specs:
@@ -659,6 +668,7 @@ DEPENDENCIES
   foodsoft_b85!
   foodsoft_discourse!
   foodsoft_documents!
+  foodsoft_invoices!
   foodsoft_links!
   foodsoft_messages!
   foodsoft_polls!
diff --git a/app/lib/foodsoft/asset_registry.rb b/app/lib/foodsoft/asset_registry.rb
new file mode 100644
index 000000000..fb5e162c3
--- /dev/null
+++ b/app/lib/foodsoft/asset_registry.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module Foodsoft
+  class AssetRegistry
+    class << self
+      def stylesheets
+        @stylesheets ||= Set.new(['application'])
+      end
+
+      def javascripts
+        @javascripts ||= Set.new(['application_legacy'])
+      end
+
+      def register_stylesheet(name)
+        stylesheets.add(name)
+      end
+
+      def register_javascript(name)
+        javascripts.add(name)
+      end
+
+      def precompile_assets
+        (stylesheets.map { |s| "#{s}.css" } + javascripts.map { |j| "#{j}.js" }).to_a
+      end
+    end
+  end
+end
diff --git a/app/views/finance/balancing/_orders.html.haml b/app/views/finance/balancing/_orders.html.haml
index 3f20d850e..54bf2f90a 100644
--- a/app/views/finance/balancing/_orders.html.haml
+++ b/app/views/finance/balancing/_orders.html.haml
@@ -12,7 +12,8 @@
         %th
     %tbody
       - @orders.each do |order|
-        %tr{:class => cycle("even","odd", :name => "order")}
+        - row_class = cycle("even","odd", :name => "order")
+        %tr{:class => row_class, 'data-order_id' => order.id}
           %td= link_to truncate(order.name), new_finance_order_path(order_id: order.id)
           %td=h format_time(order.ends) unless order.ends.nil?
           %td= order.closed? ? t('.cleared', amount: number_to_currency(order.foodcoop_result)) : t('.ended')
diff --git a/app/views/layouts/_header.html.haml b/app/views/layouts/_header.html.haml
index 66e143550..404a1f09b 100644
--- a/app/views/layouts/_header.html.haml
+++ b/app/views/layouts/_header.html.haml
@@ -6,7 +6,7 @@
     %meta(name="viewport" content="width=device-width, initial-scale=1.0")
     %title= [t('layouts.foodsoft'), yield(:title)].join(" - ")
     = csrf_meta_tags
-    = stylesheet_link_tag "application", :media => "all"
+    = stylesheet_link_tag *Foodsoft::AssetRegistry.stylesheets, media: "all"
     //%link(href="images/favicon.ico" rel="shortcut icon")
     = yield(:head)
     = foodcoop_css_tag
@@ -20,7 +20,7 @@
       \==================================================
     / Placed at the end of the document so the pages load faster
     = javascript_importmap_tags
-    = javascript_include_tag "application_legacy"
+    = javascript_include_tag *Foodsoft::AssetRegistry.javascripts
 
     :javascript
       I18n.defaultLocale = "#{I18n.default_locale}";
diff --git a/config/app_config.yml.SAMPLE b/config/app_config.yml.SAMPLE
index fa439e0eb..98d0e5bee 100644
--- a/config/app_config.yml.SAMPLE
+++ b/config/app_config.yml.SAMPLE
@@ -19,6 +19,7 @@ default: &defaults
     country: Deutschland
     email: foodsoft@foodcoop.test
     phone: "030 323 23249"
+    tax_number: "12345"
 
   # Homepage
   homepage: http://www.foodcoop.test
@@ -105,6 +106,12 @@ default: &defaults
   # Members of a user's groups and administrators can still see full names.
   use_nick: false
 
+  # When use_invoices is enabled, it is possible to generate group order invoices
+  # in balancing view.
+  use_invoices: false
+  group_order_invoices:
+    vat_exempt: false
+
   # Most plugins can be enabled/disabled here as well. Messages and wiki are enabled
   # by default and need to be set to false to disable. Most other plugins needs to
   # be enabled before they do anything.
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index d52cecaa7..337fe99c4 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -10,3 +10,8 @@
 # application.js, application.css, and all non-JS/CSS in the app/assets
 # folder are already added.
 Rails.application.config.assets.precompile += %w[application_legacy.js jquery.min.js trix-editor-overrides.js]
+
+# Add registered assets after all plugins have been initialized
+Rails.application.config.after_initialize do
+  Rails.application.config.assets.precompile += Foodsoft::AssetRegistry.precompile_assets
+end
diff --git a/config/locales/de.yml b/config/locales/de.yml
index dbff0b4a5..88cddd3e9 100644
--- a/config/locales/de.yml
+++ b/config/locales/de.yml
@@ -1566,6 +1566,7 @@ de:
       confirm_end: Willst Du wirklich die Bestellung %{order} beenden? Es gibt kein zurück.
       new_order: Neue Bestellung anlegen
       no_open_or_finished_orders: Derzeit gibt es keine laufende oder beendete Bestellungen.
+      not_closed: Nicht abgerechnet
       orders_finished: Beendet
       orders_open: Laufend
       orders_settled: Abgerechnet
@@ -1976,6 +1977,7 @@ de:
     cancel: Abbrechen
     close: Schließen
     confirm_delete: Willst du %{name} wirklich löschen?
+    confirm_mark_all: Willst du wirklich '%{name}' für alle setzen?
     confirm_restore: Willst du %{name} wirklich wiederherstellen?
     copy: Kopieren
     delete: Löschen
@@ -2010,3 +2012,4 @@ de:
   time:
     formats:
       foodsoft_datetime: "%d.%m.%Y %H:%M"
+      file: "%Y-%d-%B"
diff --git a/config/locales/en.yml b/config/locales/en.yml
index b7f1c5a6d..87ebe714f 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1571,6 +1571,7 @@ en:
       confirm_end: Do you really want to close the order %{order}? There is no going back.
       new_order: Create new order
       no_open_or_finished_orders: There are currently no open or closed orders.
+      not_closed: Not accounted
       orders_finished: Closed
       orders_open: Open
       orders_settled: Settled
@@ -1981,6 +1982,7 @@ en:
     cancel: Cancel
     close: Close
     confirm_delete: Do you really want to delete %{name}?
+    confirm_mark_all: Do you really want to set '%{name}' for all?
     confirm_restore: Do you really want to restore %{name}?
     copy: Copy
     delete: Delete
@@ -2015,3 +2017,4 @@ en:
   time:
     formats:
       foodsoft_datetime: "%Y-%m-%d %H:%M"
+      file: "%Y-%d-%B"
diff --git a/config/locales/es.yml b/config/locales/es.yml
index fa1bd5773..69d32d31e 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -1894,3 +1894,4 @@ es:
   time:
     formats:
       foodsoft_datetime: "%d/%b/%Y %H:%M"
+      file: "%Y-%d-%B"
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 71b80743c..91c6b8f11 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -1366,3 +1366,4 @@ fr:
   time:
     formats:
       foodsoft_datetime: "%d/%m/%Y %H:%M"
+      file: "%Y-%d-%B"
diff --git a/config/locales/nl.yml b/config/locales/nl.yml
index 7ab1086c4..96f486d07 100644
--- a/config/locales/nl.yml
+++ b/config/locales/nl.yml
@@ -1487,6 +1487,7 @@ nl:
       confirm_end: Wil je de bestelling %{order} werkelijk sluiten? Dit kun je niet ongedaan maken.
       new_order: Nieuwe bestelling openen
       no_open_or_finished_orders: Er zijn momenteel geen open of gesloten bestellingen.
+      not_closed: Niet afgerekend
       orders_finished: Gesloten
       orders_open: Open
       orders_settled: Afgerekend
@@ -1861,6 +1862,7 @@ nl:
     cancel: Annuleren
     close: Sluiten
     confirm_delete: Wil je %{name} echt verwijderen?
+    confirm_mark_all: Wil je '%{name}' echt voor iedereen instellen?
     confirm_restore: Wil je %{name} echt opnieuw actief maken?
     copy: Kopiëren
     delete: Verwijder
@@ -1895,3 +1897,4 @@ nl:
   time:
     formats:
       foodsoft_datetime: "%d-%m-%Y %H:%M"
+      file: "%Y-%d-%B"
diff --git a/config/locales/tr.yml b/config/locales/tr.yml
index 00ae9ae73..6a73b691e 100644
--- a/config/locales/tr.yml
+++ b/config/locales/tr.yml
@@ -1892,3 +1892,4 @@ tr:
   time:
     formats:
       foodsoft_datetime: "%d.%b.%Y %H:%M"
+      file: "%Y-%d-%B"
diff --git a/plugins/invoices/README.md b/plugins/invoices/README.md
new file mode 100644
index 000000000..b9fda231a
--- /dev/null
+++ b/plugins/invoices/README.md
@@ -0,0 +1,71 @@
+# Foodsoft Invoices Plugin
+
+This plugin adds comprehensive invoice functionality to the [Foodsoft](https://github.com/foodcoops/foodsoft) system.
+
+## Features
+
+The plugin will provide the following features:
+
+- Group Order Invoices - Invoices for individual group orders
+- Ordergroup Invoices - Invoices that can span multiple group orders for the same ordergroup
+- PDF generation for invoices
+- Email notifications for invoices
+- SEPA integration for payment processing
+- Administrative features for invoice management
+
+## Installation
+
+1. Add the plugin to your Gemfile:
+   ```ruby
+   gem 'foodsoft_invoices', path: 'plugins/invoices'
+   ```
+
+2. Run bundle install:
+   ```
+   bundle install
+   ```
+
+3. Enable the plugin in your foodsoft configuration:
+   ```yml
+   use_invoices: true
+   ```
+
+## Development
+
+This plugin is currently under development. The initial version provides the basic infrastructure for the invoice functionality, with additional features to be added in subsequent releases.
+
+## Migrations
+
+To install the required database migrations, run the following rake task:
+
+```
+rake foodsoft_invoices_engine:install:migrations
+```
+
+Then run the migrations with:
+
+```
+rake db:migrate
+```
+
+## Configuration
+
+The plugin provides several configuration options that can be set in your `app_config.yml`:
+
+- `use_invoices` - Enable or disable the plugin (default: false)
+- `contact.tax_number` - The tax number to be displayed on invoices
+- `group_order_invoices.vat_exempt` - Set to `true` if your organization is VAT exempt (default: false)
+
+Example configuration:
+
+```yaml
+use_invoices: true
+contact:
+  tax_number: "123456789"
+group_order_invoices:
+  vat_exempt: true
+```
+
+## Contact
+
+Most of the code was originally written by @viehlieb. The code was ported to this plugin by Robert (rw@roko.li). It is part of the Foodsoft project. Original sources may be available in [Local-IT Gitlab](https://git.local-it.org/Foodsoft/foodsoft/src/branch/automatic_group_order_invoice).
\ No newline at end of file
diff --git a/plugins/invoices/Rakefile b/plugins/invoices/Rakefile
new file mode 100644
index 000000000..68c9a1643
--- /dev/null
+++ b/plugins/invoices/Rakefile
@@ -0,0 +1,20 @@
+begin
+  require 'bundler/setup'
+rescue LoadError
+  puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
+end
+
+require 'rdoc/task'
+
+RDoc::Task.new(:rdoc) do |rdoc|
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.title    = 'FoodsoftInvoices'
+  rdoc.options << '--line-numbers'
+  rdoc.rdoc_files.include('README.md')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+end
+
+APP_RAKEFILE = File.expand_path('../../Rakefile', __dir__)
+load 'rails/tasks/engine.rake'
+
+Bundler::GemHelper.install_tasks
diff --git a/plugins/invoices/app/assets/javascripts/foodsoft_invoices.js b/plugins/invoices/app/assets/javascripts/foodsoft_invoices.js
new file mode 100644
index 000000000..dd826661f
--- /dev/null
+++ b/plugins/invoices/app/assets/javascripts/foodsoft_invoices.js
@@ -0,0 +1,24 @@
+$(document).on('ready turbolinks:load', function () {
+    $('.expand-trigger').click(function () {
+        var tableRow = $(this).closest('tr')
+        var orderId = tableRow.data('order_id');
+        var multiOrderId = tableRow.data('multi_order_id');
+
+        if(multiOrderId != undefined){
+            var expandedRow = $('#expanded-multi-row-' + multiOrderId);
+            console.log(multiOrderId);
+        }
+        else
+        {
+            var expandedRow = $('#expanded-row-' + orderId);
+        }
+        // Toggle visibility of the expanded row
+
+        expandedRow.toggleClass('hidden');
+
+        tableRow.toggleClass('border');
+        expandedRow.toggleClass('bordered');
+
+        return false; // Prevent the default behavior of the link
+    });
+});
diff --git a/plugins/invoices/app/assets/stylesheets/foodsoft_invoices.css b/plugins/invoices/app/assets/stylesheets/foodsoft_invoices.css
new file mode 100644
index 000000000..7bec979d4
--- /dev/null
+++ b/plugins/invoices/app/assets/stylesheets/foodsoft_invoices.css
@@ -0,0 +1,69 @@
+.checkbox-icon {
+    display: inline-block;
+    width: 20px;
+    height: 20px;
+    position: relative;
+    cursor: pointer;
+}
+
+.checkbox-icon::before {
+    content: "";
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    border: 1px solid #000;
+    background-color: white;
+}
+
+.checkbox-icon.checked::before {
+    content: "\2713"; /* Unicode checkmark symbol */
+    text-align: center;
+    font-size: 14px;
+    line-height: 20px; /* Align the checkmark vertically */
+    color: #00ff00; /* Change the color to represent a checked state */
+}
+
+
+.expanded-row{
+    td {
+        padding-top: 0 !important;
+    }
+}
+.hidden{
+    display: none;
+}
+.border td{
+    background-color: rgb(231, 231, 194) !important;
+}
+
+.bordered {
+    .order-modal{
+        background-color: lightgoldenrodyellow !important;
+        padding-bottom: 2em ;
+    }
+    .multi-order-modal{
+        background-color: lightgoldenrodyellow !important;
+        padding-bottom: 2em ;
+    }
+}
+
+.table.group-order-invoices-table tr{
+    background-color: rgb(255, 255, 233);
+}
+.table.group-order-invoices-table thead tr{
+    background-color: lightgoldenrodyellow;
+}
+
+.table.group-order-invoices-table tr:nth-child(odd) > td,
+.table.group-order-invoices-table tr:nth-child(even) > td{
+    background-color: rgb(255, 255, 233);
+    padding-right: 0;
+    .group-order-checkbox {
+        margin-left: 20px;
+    }
+    .form-check-input{
+        margin-left: 20px;
+    }
+}
diff --git a/plugins/invoices/app/controllers/concerns/send_group_order_invoice_pdf.rb b/plugins/invoices/app/controllers/concerns/send_group_order_invoice_pdf.rb
new file mode 100644
index 000000000..428ae3e66
--- /dev/null
+++ b/plugins/invoices/app/controllers/concerns/send_group_order_invoice_pdf.rb
@@ -0,0 +1,17 @@
+module SendGroupOrderInvoicePdf
+  extend ActiveSupport::Concern
+
+  protected
+
+  def create_invoice_pdf(group_order_invoice)
+    invoice_data = group_order_invoice.load_data_for_invoice
+    invoice_data[:title] = t('documents.group_order_invoice_pdf.title', supplier: invoice_data[:supplier])
+    invoice_data[:no_footer] = true
+    GroupOrderInvoicePdf.new invoice_data
+  end
+
+  def send_group_order_invoice_pdf(group_order_invoice)
+    pdf = create_invoice_pdf(group_order_invoice)
+    send_data pdf.to_pdf, filename: pdf.filename, type: 'application/pdf'
+  end
+end
diff --git a/plugins/invoices/app/controllers/group_order_invoices_controller.rb b/plugins/invoices/app/controllers/group_order_invoices_controller.rb
new file mode 100644
index 000000000..f4fd56270
--- /dev/null
+++ b/plugins/invoices/app/controllers/group_order_invoices_controller.rb
@@ -0,0 +1,109 @@
+class GroupOrderInvoicesController < OrderInvoicesControllerBase
+  include InvoicesHelper
+  include SendGroupOrderInvoicePdf
+
+  def show
+    @group_order_invoice = GroupOrderInvoice.find(params[:id])
+    raise RecordInvalid unless FoodsoftConfig[:contact][:tax_number]
+
+    respond_to do |format|
+      format.html do
+        send_group_order_invoice_pdf @group_order_invoice if FoodsoftConfig[:contact][:tax_number]
+      end
+      format.pdf do
+        send_group_order_invoice_pdf @group_order_invoice if FoodsoftConfig[:contact][:tax_number]
+      end
+    end
+  rescue ActiveRecord::RecordInvalid => e
+    redirect_back fallback_location: root_path, notice: I18n.t('errors.general'), alert: I18n.t('errors.general_msg', msg: "#{e} " + I18n.t('errors.check_tax_number'))
+  end
+
+  def create
+    go = GroupOrder.find(params[:group_order])
+    @order = go.order
+    begin
+      GroupOrderInvoice.find_or_create_by!(group_order_id: go.id)
+      respond_to do |format|
+        format.js
+      end
+    rescue StandardError => e
+      redirect_back fallback_location: root_path, notice: I18n.t('errors.general'), alert: I18n.t('errors.general_msg', msg: e)
+    end
+  end
+
+  def destroy
+    goi = GroupOrderInvoice.find(params[:id])
+    @order = goi.group_order.order
+    goi.destroy
+    respond_to do |format|
+      format.js
+      format.json { head :no_content }
+    end
+  end
+
+  def create_multiple
+    invoice_date = params[:group_order_invoice][:invoice_date]
+    order_id = params[:group_order_invoice][:order_id]
+    @order = Order.find(order_id)
+    gos = GroupOrder.where(order_id: order_id)
+    gos.each do |go|
+      goi = GroupOrderInvoice.find_or_create_by!(group_order_id: go.id)
+      goi.invoice_date = invoice_date
+      goi.invoice_number = generate_invoice_number(goi, 1)
+      goi.save!
+    end
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def toggle_all_paid
+    @order = Order.find(params[:order_id])
+    @group_order_invoices = @order.group_orders.map(&:group_order_invoice).compact
+    @group_order_invoices.each do |goi|
+      goi.paid = !ActiveRecord::Type::Boolean.new.deserialize(params[:paid])
+      goi.save!
+    end
+    respond_to do |format|
+      format.js
+    end
+  end
+
+  def download_all
+    order = Order.find(params[:order_id])
+    invoices = order.group_orders.map(&:group_order_invoice)
+    pdf = {}
+    file_paths = []
+    temp_file = Tempfile.new("all_invoices_for_order_#{order.id}.zip")
+    Zip::File.open(temp_file.path, Zip::File::CREATE) do |zipfile|
+      invoices.each do |invoice|
+        pdf = create_invoice_pdf(invoice)
+        file_path = File.join('tmp', pdf.filename)
+        File.open(file_path, 'w:ASCII-8BIT') do |file|
+          file.write(pdf.to_pdf)
+        end
+        file_paths << file_path
+        zipfile.add(pdf.filename, file_path) unless zipfile.find_entry(pdf.filename)
+      end
+    end
+    zip_data = File.read(temp_file.path)
+    file_paths.each do |file_path|
+      File.delete(file_path)
+    end
+    respond_to do |format|
+      format.html do
+        send_data(zip_data, type: 'application/zip', filename: "#{l order.ends, format: :file}-#{order.supplier.name}-#{order.id}.zip", disposition: 'attachment')
+      end
+    end
+  end
+
+  protected
+
+  def invoice_class
+    GroupOrderInvoice
+  end
+
+  def related_group_order(invoice)
+    invoice.group_order
+  end
+end
diff --git a/plugins/invoices/app/controllers/order_invoices_controller_base.rb b/plugins/invoices/app/controllers/order_invoices_controller_base.rb
new file mode 100644
index 000000000..58e6ef856
--- /dev/null
+++ b/plugins/invoices/app/controllers/order_invoices_controller_base.rb
@@ -0,0 +1,27 @@
+class OrderInvoicesControllerBase < ApplicationController
+  before_action :authenticate_finance
+
+  def toggle_paid
+    @invoice = invoice_class.find(params[:id])
+    @invoice.paid = !@invoice.paid
+    save_and_respond(@invoice)
+  end
+
+  protected
+
+  def save_and_respond(record)
+    if record.save!
+      respond_to { |format| format.js }
+    else
+      respond_to { |format| format.json { render json: record.errors, status: :unprocessable_entity } }
+    end
+  end
+
+  def invoice_class
+    raise NotImplementedError
+  end
+
+  def related_group_order(invoice)
+    raise NotImplementedError
+  end
+end
diff --git a/plugins/invoices/app/documents/group_order_invoice_pdf.rb b/plugins/invoices/app/documents/group_order_invoice_pdf.rb
new file mode 100644
index 000000000..d57725ba8
--- /dev/null
+++ b/plugins/invoices/app/documents/group_order_invoice_pdf.rb
@@ -0,0 +1,414 @@
+class GroupOrderInvoicePdf < RenderPdf
+  def filename
+    ordergroup_name = @options[:ordergroup].name || 'OrderGroup'
+    "#{ordergroup_name}_" + I18n.t('documents.group_order_invoice_pdf.filename', number: @options[:invoice_number]) + '.pdf'
+  end
+
+  def title
+    I18n.t('documents.group_order_invoice_pdf.title', supplier: @options[:supplier])
+  end
+
+  def body
+    contact = FoodsoftConfig[:contact].symbolize_keys
+    ordergroup = @options[:ordergroup]
+    # TODO: group_by supplier, sort alphabetically
+    # From paragraph
+    bounding_box [margin_box.right - 200, margin_box.top - 20], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoicer')
+      move_down 7
+      text FoodsoftConfig[:name], size: fontsize(9), align: :left
+      move_down 5
+      text contact[:street], size: fontsize(9), align: :left
+      move_down 5
+      text "#{contact[:zip_code]} #{contact[:city]}", size: fontsize(9), align: :left
+      move_down 5
+      if contact[:phone].present?
+        text "#{Supplier.human_attribute_name :phone}: #{contact[:phone]}", size: fontsize(9), align: :left
+        move_down 5
+      end
+      text "#{Supplier.human_attribute_name :email}: #{contact[:email]}", size: fontsize(9), align: :left if contact[:email].present?
+      move_down 5
+      text I18n.t('documents.group_order_invoice_pdf.tax_number', number: @options[:tax_number]), size: fontsize(9), align: :left
+    end
+
+    # Receiving Ordergroup
+    bounding_box [margin_box.left, margin_box.top - 20], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoicee')
+      move_down 7
+      text I18n.t('documents.group_order_invoice_pdf.ordergroup.name', ordergroup: ordergroup.name.to_s), size: fontsize(9)
+      move_down 5
+      if ordergroup.contact_address.present?
+        text I18n.t('documents.group_order_invoice_pdf.ordergroup.contact_address', contact_address: ordergroup.contact_address.to_s), size: fontsize(9)
+        move_down 5
+      end
+      if ordergroup.contact_phone.present?
+        text I18n.t('documents.group_order_invoice_pdf.ordergroup.contact_phone', contact_phone: ordergroup.contact_phone.to_s), size: fontsize(9)
+        move_down 5
+      end
+      if ordergroup.respond_to?(:customer_number) && ordergroup.customer_number.present?
+        text I18n.t('documents.group_order_invoice_pdf.ordergroup.customer_number', customer_number: ordergroup.customer_number.to_s), size: fontsize(9)
+        move_down 5
+      end
+    end
+
+    # invoice Date and nnvoice number
+    bounding_box [margin_box.right - 200, margin_box.top - 150], width: 200 do
+      text I18n.t('documents.group_order_invoice_pdf.invoice_number', invoice_number: @options[:invoice_number]), align: :left
+      move_down 5
+      text I18n.t('documents.group_order_invoice_pdf.invoice_date', invoice_date: @options[:invoice_date].strftime(I18n.t('date.formats.default'))), align: :left
+      if @options[:pickup]
+        move_down 5
+        text I18n.t('documents.group_order_invoice_pdf.pickup_date', invoice_date: @options[:pickup].strftime(I18n.t('date.formats.default')))
+      end
+    end
+
+    move_down 20
+    text I18n.t('documents.group_order_invoice_pdf.payment_method', payment_method: @options[:payment_method])
+    text I18n.t('documents.group_order_invoice_pdf.table_headline')
+    move_down 5
+
+    #------------- Table Data -----------------------
+
+    if FoodsoftConfig[:group_order_invoices][:vat_exempt]
+      body_for_vat_exempt
+    else
+      body_with_vat
+    end
+  end
+
+  def body_for_vat_exempt
+    data = [I18n.t('documents.group_order_invoice_pdf.vat_exempt_rows')]
+    move_down 10
+
+    # Get all the articles
+    group_order_articles = fetch_group_order_articles
+    separate_deposits = FoodsoftConfig[:group_order_invoices]&.[](:separate_deposits)
+
+    # Build data table
+    data, total_gross = build_vat_exempt_data_table(data, group_order_articles, separate_deposits)
+
+    # Render data table
+    render_data_table(data)
+
+    # Render sum table
+    move_down 5
+    render_vat_exempt_sum_table(total_gross)
+
+    # Render footer text
+    move_down 25
+    text I18n.t('documents.group_order_invoice_pdf.small_business_regulation')
+    move_down 10
+  end
+
+  # Fetches all group order articles for the invoice
+  def fetch_group_order_articles
+    GroupOrderArticle.where(group_order_id: @options[:group_order_ids])
+  end
+
+  # Builds the data table for VAT exempt invoices
+  def build_vat_exempt_data_table(data, group_order_articles, separate_deposits)
+    total_gross = 0
+    supplier = ''
+
+    group_order_articles.each do |goa|
+      # Skip if no units received
+      next if goa.result.to_i == 0
+
+      # Add supplier header if it changed
+      if goa.group_order.order.supplier.name != supplier
+        supplier = goa.group_order.order.supplier.name
+        data << [supplier, '', '', '']
+      end
+
+      # Add article row
+      goa_total_price = separate_deposits ? goa.total_price_without_deposit : goa.total_price
+      data << [goa.order_article.article.name,
+               goa.result.to_i,
+               number_to_currency(goa.order_article.price.fc_price_without_deposit),
+               number_to_currency(goa_total_price)]
+      total_gross += goa_total_price
+
+      # Add deposit row if needed
+      next unless separate_deposits && goa.order_article.price.deposit > 0.0
+
+      goa_total_deposit = goa.result * goa.order_article.price.fc_deposit_price
+      data << ['zzgl. Pfand',
+               goa.result.to_i,
+               number_to_currency(goa.order_article.article.fc_deposit_price),
+               number_to_currency(goa_total_deposit)]
+      total_gross += goa_total_deposit
+    end
+
+    [data, total_gross]
+  end
+
+  # Renders the data table with proper formatting
+  def render_data_table(data)
+    table data, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+      table.row(0).column(0..4).width = 80
+      table.row(0).column(0).width = 180
+      table.row(0).border_bottom_width = 2
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+  end
+
+  # Renders the sum table for VAT exempt invoices
+  def render_vat_exempt_sum_table(total_gross)
+    sum = []
+    sum << [nil, nil, I18n.t('documents.group_order_invoice_pdf.sum_to_pay_gross'), number_to_currency(total_gross)]
+
+    table sum, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+      table.row(0).columns(2..4).style(align: :bottom)
+      table.row(0).border_bottom_width = 2
+      table.row(0..-1).columns(0..1).border_width = 0
+
+      table.rows(0..-1).columns(0..4).width = 80
+      table.row(0).column(0).width = 180
+      table.row(0).column(-1).style(font_style: :bold)
+      table.row(0).column(-2).style(font_style: :bold)
+      table.row(0).column(-1).size = fontsize(10)
+      table.row(0).column(-2).size = fontsize(10)
+
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+  end
+
+  def body_with_vat
+    separate_deposits = FoodsoftConfig[:group_order_invoices]&.[](:separate_deposits)
+    marge = FoodsoftConfig[:price_markup]
+
+    # Initialize tax hashes and totals
+    tax_hashes = initialize_tax_hashes(separate_deposits)
+
+    # Build data table
+    data = build_vat_data_header(marge)
+    data, totals = build_vat_data_table(data, tax_hashes, separate_deposits)
+
+    # Render data table
+    render_vat_data_table(data)
+
+    # Build and render sum table
+    move_down 10
+    sum = build_vat_sum_table(tax_hashes, totals, marge)
+    render_vat_sum_table(sum, marge)
+
+    # Render footer text if needed
+    if FoodsoftConfig[:group_order_invoices][:vat_exempt]
+      move_down 15
+      text I18n.t('documents.group_order_invoice_pdf.small_business_regulation')
+    end
+    move_down 10
+  end
+
+  # Initialize tax hashes and totals for VAT calculations
+  def initialize_tax_hashes(separate_deposits)
+    result = {
+      net: Hash.new(0),      # for summing up article net prices grouped into vat percentage
+      gross: Hash.new(0),    # same here with gross prices
+      fc: Hash.new(0),       # same here with fc prices
+      totals: {
+        gross: 0,
+        net: 0
+      }
+    }
+
+    if separate_deposits
+      result[:deposit] = {
+        gross: Hash.new(0),  # for summing up deposit gross prices grouped into vat percentage
+        net: Hash.new(0),    # same here with gross prices
+        fc: Hash.new(0),     # same here with fc prices
+        totals: {
+          deposit: 0,
+          deposit_gross: 0
+        }
+      }
+    end
+
+    result
+  end
+
+  # Build the header row for the VAT data table
+  def build_vat_data_header(marge)
+    if marge == 0
+      [I18n.t('documents.group_order_invoice_pdf.no_price_markup_rows')]
+    else
+      [I18n.t('documents.group_order_invoice_pdf.price_markup_rows', marge: marge)]
+    end
+  end
+
+  # Build the data table for VAT included invoices
+  def build_vat_data_table(data, tax_hashes, separate_deposits)
+    group_order_articles = fetch_group_order_articles.includes(group_order: { order: :supplier })
+
+    # Group articles by supplier
+    group_order_articles.group_by { |goa| goa.group_order.order.supplier.name }.each do |supplier_name, articles|
+      data << [supplier_name, '', '', '', '', ''] if articles.map(&:result).sum > 0
+
+      # Process each article
+      articles.each do |goa|
+        next if goa.result.to_i == 0
+
+        # Add article row
+        data = add_article_row_with_vat(data, goa, tax_hashes, separate_deposits)
+
+        # Add deposit row if needed
+        data = add_deposit_row_with_vat(data, goa, tax_hashes) if separate_deposits && goa.order_article.price.deposit > 0.0
+      end
+    end
+
+    # Extract totals from tax_hashes
+    totals = {
+      gross: tax_hashes[:totals][:gross],
+      deposit_gross: tax_hashes[:deposit] ? tax_hashes[:deposit][:totals][:deposit_gross] : 0
+    }
+
+    [data, totals]
+  end
+
+  # Add an article row to the data table with VAT
+  def add_article_row_with_vat(data, goa, tax_hashes, separate_deposits)
+    order_article = goa.order_article
+    tax = order_article.price.tax
+    goa_total_net = goa.result * order_article.price.price
+
+    goa_total_fc = separate_deposits ? goa.total_price_without_deposit : goa.total_price
+    goa_total_gross = separate_deposits ? goa.result * order_article.price.gross_price_without_deposit : goa.result * order_article.price.gross_price
+
+    data << [order_article.article_version.name,
+             goa.result.to_i,
+             number_to_currency(order_article.price.price),
+             number_to_currency(goa_total_net),
+             tax.to_s + '%',
+             number_to_currency(goa_total_fc)]
+
+    # Update tax hashes
+    tax_hashes[:net][tax.to_i] += goa_total_net
+    tax_hashes[:gross][tax.to_i] += goa_total_gross
+    tax_hashes[:fc][tax.to_i] += goa_total_fc
+
+    # Update totals
+    tax_hashes[:totals][:net] += goa_total_net
+    tax_hashes[:totals][:gross] += goa_total_fc
+
+    data
+  end
+
+  # Add a deposit row to the data table with VAT
+  def add_deposit_row_with_vat(data, goa, tax_hashes)
+    order_article = goa.order_article
+    tax = order_article.price.tax
+
+    goa_net_deposit = goa.result * order_article.price.net_deposit_price
+    goa_deposit = goa.result * order_article.price.deposit
+    goa_total_deposit = goa.result * order_article.price.fc_deposit_price
+
+    data << ['zzgl. Pfand',
+             goa.result.to_i,
+             number_to_currency(order_article.price.net_deposit_price),
+             number_to_currency(goa_net_deposit),
+             tax.to_s + '%',
+             number_to_currency(goa_total_deposit)]
+
+    # Update deposit tax hashes
+    tax_hashes[:deposit][:net][tax.to_i] += goa_net_deposit
+    tax_hashes[:deposit][:gross][tax.to_i] += goa_deposit
+    tax_hashes[:deposit][:fc][tax.to_i] += goa_total_deposit
+
+    # Update deposit totals
+    tax_hashes[:deposit][:totals][:deposit] += goa_deposit
+    tax_hashes[:deposit][:totals][:deposit_gross] += goa_total_deposit
+
+    data
+  end
+
+  # Render the data table for VAT included invoices
+  def render_vat_data_table(data)
+    table data, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+      table.row(0).columns(0..6).style(background_color: 'cccccc', font_style: :bold)
+      table.rows(0..-1).columns(2..6).width = 80
+      table.rows(0..-1).column(0).width = 170
+      table.rows(0..-1).column(1).width = 40
+      table.rows(0..-1).column(4).width = 60
+      table.rows(0..-1).column(5).width = 90
+      table.row(0).border_bottom_width = 2
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+  end
+
+  # Build the sum table for VAT included invoices
+  def build_vat_sum_table(tax_hashes, totals, marge)
+    sum = if marge > 0
+            [[nil, nil, 'Netto', 'MwSt', 'FC-Marge', 'Brutto']]
+          else
+            [[nil, nil, nil, 'Netto', 'MwSt', 'Brutto']]
+          end
+
+    # Add rows for each tax rate
+    tax_hashes[:gross].each_key do |key|
+      # Add product row
+      sum = add_tax_sum_row(sum, key, tax_hashes, 'Produkte', marge)
+
+      # Add deposit row if needed
+      sum = add_tax_sum_row(sum, key, tax_hashes[:deposit], 'Pfand', marge) if tax_hashes[:deposit] && tax_hashes[:deposit][:gross][key] > 0
+    end
+
+    # Add total row
+    total_amount = totals[:gross] + totals[:deposit_gross]
+    sum << [nil, nil, nil, nil, I18n.t('documents.group_order_invoice_pdf.sum_to_pay_gross'), number_to_currency(total_amount)]
+
+    sum
+  end
+
+  # Add a tax sum row to the sum table
+  def add_tax_sum_row(sum, tax_key, tax_hash, label, marge)
+    tmp_sum = [nil, "#{label} mit #{tax_key}%", number_to_currency(tax_hash[:net][tax_key])]
+    tmp_sum.unshift(nil) if marge <= 0
+    tmp_sum << number_to_currency(tax_hash[:gross][tax_key] - tax_hash[:net][tax_key])
+    tmp_sum << number_to_currency(tax_hash[:fc][tax_key] - tax_hash[:gross][tax_key]) if marge > 0
+    tmp_sum << number_to_currency(tax_hash[:fc][tax_key])
+    sum << tmp_sum
+    sum
+  end
+
+  # Render the sum table for VAT included invoices
+  def render_vat_sum_table(sum, marge)
+    table sum, cell_style: { size: fontsize(8), overflow: :shrink_to_fit } do |table|
+      table.header = true
+      table.position = :center
+      table.cells.border_width = 1
+      table.cells.border_color = '666666'
+      table.row(0).columns(2..6).style(align: :bottom)
+      table.row(0).border_bottom_width = 2
+      table.row(0..-1).columns(0).border_width = 0
+      table.row(0..-1).columns(1).border_width = 0 if marge <= 0
+      table.rows(0..-1).columns(2..6).width = 80
+      table.rows(0..-1).column(0).width = 110
+      table.rows(0..-1).column(1).width = 100
+      table.rows(0..-1).column(4).width = 60
+      table.rows(0..-1).column(5).width = 90
+
+      table.row(-1).column(-1).style(font_style: :bold)
+      table.row(-1).column(-2).style(font_style: :bold)
+      table.row(-1).column(-1).size = fontsize(10)
+      table.row(-1).column(-2).size = fontsize(10)
+
+      table.columns(1).align = :right
+      table.columns(1..6).align = :right
+    end
+  end
+end
diff --git a/plugins/invoices/app/helpers/invoices_helper.rb b/plugins/invoices/app/helpers/invoices_helper.rb
new file mode 100644
index 000000000..9c4c0d8d4
--- /dev/null
+++ b/plugins/invoices/app/helpers/invoices_helper.rb
@@ -0,0 +1,10 @@
+module InvoicesHelper
+  def generate_invoice_number(instance, count)
+    trailing_number = count.to_s.rjust(4, '0')
+    if GroupOrderInvoice.find_by(invoice_number: instance.invoice_date.strftime('%Y%m%d') + trailing_number)
+      generate_invoice_number(instance, count.to_i + 1)
+    else
+      instance.invoice_date.strftime('%Y%m%d') + trailing_number
+    end
+  end
+end
diff --git a/plugins/invoices/app/models/concerns/group_order_extensions.rb b/plugins/invoices/app/models/concerns/group_order_extensions.rb
new file mode 100644
index 000000000..569ae7f59
--- /dev/null
+++ b/plugins/invoices/app/models/concerns/group_order_extensions.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module GroupOrderExtensions
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :group_order_invoice
+  end
+end
diff --git a/plugins/invoices/app/models/concerns/invoice_common.rb b/plugins/invoices/app/models/concerns/invoice_common.rb
new file mode 100644
index 000000000..532852fd3
--- /dev/null
+++ b/plugins/invoices/app/models/concerns/invoice_common.rb
@@ -0,0 +1,24 @@
+# app/models/concerns/invoice_common.rb
+module InvoiceCommon
+  extend ActiveSupport::Concern
+
+  included do
+    include InvoicesHelper
+
+    validates_presence_of :invoice_number
+    validates_uniqueness_of :invoice_number
+    validate :tax_number_set
+
+    after_initialize :init, unless: :persisted?
+  end
+
+  def name
+    I18n.t("activerecord.attributes.#{self.class.name.underscore}.name") + "_#{invoice_number}"
+  end
+
+  def tax_number_set
+    return if FoodsoftConfig[:contact][:tax_number].present?
+
+    errors.add(:base, I18n.t('activerecord.attributes.group_order_invoice.tax_number_not_set'))
+  end
+end
diff --git a/plugins/invoices/app/models/group_order_invoice.rb b/plugins/invoices/app/models/group_order_invoice.rb
new file mode 100644
index 000000000..059056630
--- /dev/null
+++ b/plugins/invoices/app/models/group_order_invoice.rb
@@ -0,0 +1,40 @@
+class GroupOrderInvoice < ApplicationRecord
+  include InvoiceCommon
+
+  belongs_to :group_order
+  validates_presence_of :group_order
+  validates_uniqueness_of :group_order_id
+
+  def init
+    self.invoice_date = Time.now unless invoice_date
+    self.invoice_number = generate_invoice_number(self, 1) unless invoice_number
+    self.payment_method = group_order&.financial_transaction&.financial_transaction_type&.name || FoodsoftConfig[:group_order_invoices]&.[](:payment_method) || I18n.t('activerecord.attributes.group_order_invoice.payment_method') unless payment_method
+  end
+
+  def load_data_for_invoice
+    invoice_data = {}
+    order = group_order.order
+    invoice_data[:pickup] = order.pickup
+    invoice_data[:supplier] = order.supplier&.name
+    invoice_data[:ordergroup] = group_order.ordergroup
+    invoice_data[:group_order_ids] = [group_order.id]
+    invoice_data[:invoice_number] = invoice_number
+    invoice_data[:invoice_date] = invoice_date
+    invoice_data[:tax_number] = FoodsoftConfig[:contact][:tax_number]
+    invoice_data[:payment_method] = payment_method
+    invoice_data[:order_articles] = {}
+    group_order.order_articles.each do |order_article|
+      # Get the result of last time ordering, if possible
+      goa = group_order.group_order_articles.detect { |tmp_goa| tmp_goa.order_article_id == order_article.id }
+
+      # Build hash with relevant data
+      invoice_data[:order_articles][order_article.id] = {
+        price: order_article.article_version.fc_price,
+        quantity: (goa ? goa.quantity : 0),
+        total_price: (goa ? goa.total_price : 0),
+        tax: order_article.article_version.tax
+      }
+    end
+    invoice_data
+  end
+end
diff --git a/plugins/invoices/app/overrides/finance/balancing/_orders/add_expanded_row.html.haml.deface b/plugins/invoices/app/overrides/finance/balancing/_orders/add_expanded_row.html.haml.deface
new file mode 100644
index 000000000..0ad072615
--- /dev/null
+++ b/plugins/invoices/app/overrides/finance/balancing/_orders/add_expanded_row.html.haml.deface
@@ -0,0 +1,6 @@
+/ insert_after 'tbody tr'
+- if FoodsoftInvoices.enabled?
+  - row_id = "expanded-row-#{order.id}"
+  %tr{:class => 'expanded-row hidden', :id => row_id}
+    %td{:colspan => '7'}
+      = render partial: 'group_order_invoices/modal', locals: { order: order }
diff --git a/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column.html.haml.deface b/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column.html.haml.deface
new file mode 100644
index 000000000..fa22a4b35
--- /dev/null
+++ b/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column.html.haml.deface
@@ -0,0 +1,11 @@
+/ insert_before 'tbody tr td:last-child'
+- if FoodsoftInvoices.enabled?
+  - col_id = "group-order-invoices-for-order-#{order.id}"
+  %td{id: col_id}
+    - if order.closed?
+      -if FoodsoftConfig[:contact][:tax_number] && order.ordergroups.present?
+        = link_to I18n.t('activerecord.attributes.group_order_invoice.open_details_modal'), "#", class: 'btn btn-small expand-trigger'
+      -else
+        = I18n.t('activerecord.attributes.group_order_invoice.tax_number_not_set')
+    - else
+      = t('orders.index.not_closed')
diff --git a/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column_heading.html.haml.deface b/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column_heading.html.haml.deface
new file mode 100644
index 000000000..c46fd6712
--- /dev/null
+++ b/plugins/invoices/app/overrides/finance/balancing/_orders/add_invoice_column_heading.html.haml.deface
@@ -0,0 +1,3 @@
+/ insert_before 'thead tr th:last-child'
+- if FoodsoftInvoices.enabled?
+  %th= heading_helper GroupOrderInvoice, :name
diff --git a/plugins/invoices/app/views/group_order_invoices/_links.html.haml b/plugins/invoices/app/views/group_order_invoices/_links.html.haml
new file mode 100644
index 000000000..8fad13bbe
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/_links.html.haml
@@ -0,0 +1,46 @@
+- show_generate_with_date = true
+- order.group_orders.each do |go|
+  - if go.group_order_invoice.present?
+    - show_generate_with_date = false
+- if show_generate_with_date
+  = form_for :group_order_invoice, url: finance_group_order_invoice_path(foodcoop: FoodsoftConfig[:default_scope], protocol: :https), remote: true do |f|
+    = f.label :invoice_date, I18n.t('activerecord.attributes.group_order_invoice.links.invoice_date')
+    = f.date_field :invoice_date, {value: Date.today, max: Date.today, required: true}
+    = f.hidden_field :order_id, value: order.id
+    = f.submit  I18n.t('activerecord.attributes.group_order_invoice.links.generate_with_date'), class: 'btn btn'
+%table.table.group-order-invoices-table
+  %thead
+    %tr
+      %th=I18n.t('activerecord.attributes.group_order_invoice.links.ordergroup')
+      %th=I18n.t('activerecord.attributes.group_order_invoice.links.paid')
+      %th= I18n.t('activerecord.attributes.group_order_invoice.links.invoice_number')
+      %th
+  %tbody
+    - order.group_orders.includes([:group_order_invoice, :ordergroup]).each do |go|
+      -if go.ordergroup.present?
+        - if go.group_order_invoice
+          %tr.order-row{id: "group_order_#{go.id}"}
+            %td= link_to go.ordergroup&.name, edit_admin_ordergroup_path(go.ordergroup)
+            %td
+              .div{id: "paid_#{go.group_order_invoice.id}"}
+                = render :partial => "group_order_invoices/toggle_paid", locals: { group_order_invoice: go.group_order_invoice }
+            %td
+              %b= go.group_order_invoice.invoice_number
+            %td
+              = link_to I18n.t('activerecord.attributes.group_order_invoice.links.download'), group_order_invoice_path(go.group_order_invoice, :format => 'pdf'), class: 'btn btn-block'
+              = link_to  I18n.t('activerecord.attributes.group_order_invoice.links.delete'), go.group_order_invoice, method: :delete, class: 'btn btn-block btn-danger', remote: true, data: { confirm: I18n.t('ui.confirm_delete', name: "Bestellgruppenrechnung für #{go.ordergroup.name}" ) }
+        - else
+          %tr
+            %td
+              = go.ordergroup&.name
+              = button_to I18n.t('activerecord.attributes.group_order_invoice.links.generate'), group_order_invoices_path(:method => :post, group_order: go) ,class: 'btn btn-small', params: {id: order.id}, remote: true
+            %td
+            %td
+            %td
+    - if order.group_orders.map(&:group_order_invoice).compact.present?
+      %tr.order-row
+        %td= I18n.t('activerecord.attributes.group_order_invoice.links.actions_for_all')
+        %td= render :partial => 'group_order_invoices/toggle_all_paid', locals: { order: order }
+        %td
+        %td
+          = link_to I18n.t('activerecord.attributes.group_order_invoice.links.download_all_zip'), download_all_group_order_invoices_path(order_id: order.id), class: 'btn btn-block'
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/_modal.html.haml b/plugins/invoices/app/views/group_order_invoices/_modal.html.haml
new file mode 100644
index 000000000..66948156e
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/_modal.html.haml
@@ -0,0 +1,2 @@
+.div{id: "order_#{order.id}_modal", class: 'order-modal', data: { order_id: order.id, supplier: order.supplier&.name } }
+  = render :partial => 'group_order_invoices/links', locals: { order: order }
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/_toggle_all_paid.html.haml b/plugins/invoices/app/views/group_order_invoices/_toggle_all_paid.html.haml
new file mode 100644
index 000000000..9e50e2fa8
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/_toggle_all_paid.html.haml
@@ -0,0 +1,2 @@
+= link_to toggle_all_paid_group_order_invoices_path(order_id: order.id, paid: order.group_orders.map(&:group_order_invoice).compact.map(&:paid)&.all? ), remote: true, method: :patch, data: { confirm: I18n.t('ui.confirm_mark_all', name: order.group_orders.map(&:group_order_invoice).compact.map(&:paid)&.all? ? I18n.t('activerecord.attributes.group_order_invoice.links.not_paid'): I18n.t('activerecord.attributes.group_order_invoice.links.paid') ) } do
+  = check_box_tag :paid, '1', order.group_orders.map(&:group_order_invoice).compact.map(&:paid)&.all? , class: 'form-check-input', id: "paid_all_#{order.id}"
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/_toggle_paid.html.haml b/plugins/invoices/app/views/group_order_invoices/_toggle_paid.html.haml
new file mode 100644
index 000000000..ac14b5991
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/_toggle_paid.html.haml
@@ -0,0 +1,2 @@
+= link_to toggle_paid_group_order_invoice_path(group_order_invoice), remote: true, method: :patch, data: { turbolinks: false }  do
+  = check_box_tag 'paid', '1', group_order_invoice.paid , class: 'form-check-input', id: "paid_#{group_order_invoice.id}"
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/create.js.erb b/plugins/invoices/app/views/group_order_invoices/create.js.erb
new file mode 100644
index 000000000..fde95941d
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/create.js.erb
@@ -0,0 +1 @@
+$('#order_<%= @order.id %>_modal').html('<%= j render partial: "group_order_invoices/links", locals: { order: @order } %>');
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/create_multiple.js.erb b/plugins/invoices/app/views/group_order_invoices/create_multiple.js.erb
new file mode 100644
index 000000000..fde95941d
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/create_multiple.js.erb
@@ -0,0 +1 @@
+$('#order_<%= @order.id %>_modal').html('<%= j render partial: "group_order_invoices/links", locals: { order: @order } %>');
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/destroy.js.erb b/plugins/invoices/app/views/group_order_invoices/destroy.js.erb
new file mode 100644
index 000000000..fde95941d
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/destroy.js.erb
@@ -0,0 +1 @@
+$('#order_<%= @order.id %>_modal').html('<%= j render partial: "group_order_invoices/links", locals: { order: @order } %>');
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/toggle_all_paid.js.erb b/plugins/invoices/app/views/group_order_invoices/toggle_all_paid.js.erb
new file mode 100644
index 000000000..fde95941d
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/toggle_all_paid.js.erb
@@ -0,0 +1 @@
+$('#order_<%= @order.id %>_modal').html('<%= j render partial: "group_order_invoices/links", locals: { order: @order } %>');
\ No newline at end of file
diff --git a/plugins/invoices/app/views/group_order_invoices/toggle_paid.js.erb b/plugins/invoices/app/views/group_order_invoices/toggle_paid.js.erb
new file mode 100644
index 000000000..7b8487468
--- /dev/null
+++ b/plugins/invoices/app/views/group_order_invoices/toggle_paid.js.erb
@@ -0,0 +1 @@
+$('#paid_<%= @invoice.id %>').html('<%= j render partial: "group_order_invoices/toggle_paid", locals: { group_order_invoice: @invoice } %>');
\ No newline at end of file
diff --git a/plugins/invoices/config/locales/de.yml b/plugins/invoices/config/locales/de.yml
new file mode 100644
index 000000000..12404410d
--- /dev/null
+++ b/plugins/invoices/config/locales/de.yml
@@ -0,0 +1,80 @@
+de:
+  activerecord:
+    attributes:
+      group_order_invoice:
+        name: Bestellgruppenrechnung
+        sequence_type:
+          FRST: "Erst-Lastschrift"
+          RCUR: "Folge-Lastschrift"
+          OOFF: "Einmalige Lastschrift"
+          FNAL: "Letztmalige Lastschrift"
+        links:
+          actions_for_all: Aktion für alle ausführen
+          delete: Rechnung löschen
+          create_cumulative_invoice: Kumulative Rechnung erstellen
+          confirm_send_all: Möchtest Du wirklich diese Bestellgruppenrechnungen an %{ordergroups} versenden?
+          combine: Rechnungen zusammenfassen
+          download: Rechnung herunterladen
+          download_all_zip: Alle Rechnungen herunterladen (zip)
+          generate: Rechnung erzeugen
+          generate_with_date: setzen & erzeugen
+          invoice_date: Datum der Bestellgruppenrechnung
+          invoice_number: Rechnungsnummer
+          ordergroup: Bestellgruppe
+          paid: Bezahlt
+          not_paid: Nicht Bezahlt
+          send_all_by_email: Alle Rechnungen versenden
+          send_all_success: Rechnungen erfolgreich versendet
+          sepa_downloaded: SEPA exportiert
+          sepa_not_downloaded: SEPA nicht exportiert
+          sepa_not_ready:
+            SEPA Export nicht verfügbar. Wichtige Einstellungen für SEPA Export in Administration -> Einstellungen-> Finanzen fehlen
+          sepa_select: Für SEPA Export markieren
+          sepa_sequence_type: SEPA Typ
+        open_details_modal: Details ein/ausklappen
+        payment_method: Guthaben
+        tax_number_not_set: Steuernummer in den Einstellungen nicht gesetzt oder keine Bestellgruppe vorhanden
+
+  documents:
+    group_order_invoice_pdf:
+      filename: Rechnung%{number}
+      invoicer: Rechnungsteller*in
+      invoicee: Rechnungsempfänger*in
+      invoice_date: 'Rechnungsdatum: %{invoice_date}'
+      invoice_number: 'Rechnungsnummer: %{invoice_number}'
+      markup_included: zzgl. Foodcoop Marge auf brutto Preis %{marge}%
+      ordergroup:
+        contact_phone: 'Telefonnummer: %{contact_phone}'
+        contact_address: 'Adresse :  %{contact_address}'
+        customer_number: 'Kundennummer: %{customer_number}'
+        name: Bestellgruppe %{ordergroup}
+      payment_method: 'Zahlungsart: %{payment_method}'
+      pickup_date: 'Lieferdatum: %{invoice_date}'
+      sum_to_pay: Zu zahlen gesamt
+      sum_to_pay_net: Zu zahlen gesamt (netto)
+      sum_to_pay_gross: Gesamt
+      small_business_regulation: Als Kleinunternehmer*in im Sinne von §19 Abs. 1 Umsatzsteuergesetz (UStG) wird keine Umsatzsteuer berechnet.
+      table_headline: 'Für die Bestellung fallen folgende Posten an:'
+      tax_excluded: exkl. MwSt.
+      tax_included: zzgl. Gesamtsumme MwSt. %{tax}%
+      tax_number: 'Steuernummer: %{number}'
+      title: Rechnung für die Bestellung bei %{supplier}
+      vat_exempt_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis
+        - Artikel Gesamtpreis
+      no_price_markup_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis (netto)
+        - Artikel Gesamtpreis (netto)
+        - MwSt.
+        - Artikel Gesamtpreis (brutto)
+      price_markup_rows:
+        - Name
+        - Anzahl
+        - Einzelpreis (netto)
+        - Artikel Gesamtpreis (netto)
+        - MwSt.
+        - Artikel Gesamtpreis (brutto) inkl. Foodcoopmarge %{marge}%
diff --git a/plugins/invoices/config/locales/en.yml b/plugins/invoices/config/locales/en.yml
new file mode 100644
index 000000000..aca24096a
--- /dev/null
+++ b/plugins/invoices/config/locales/en.yml
@@ -0,0 +1,78 @@
+en:
+  activerecord:
+    attributes:
+      group_order_invoice:
+        name: Group Order Invoice
+        sequence_type:
+          FRST: "First Direct Debit"
+          RCUR: "Recurring Direct Debit"
+          OOFF: "One-time Direct Debit"
+          FNAL: "Final Direct Debit"
+        links:
+          actions_for_all: Actions for all group orders
+          create_cumulative_invoice: create cumulative invoice
+          combine: combine invoices
+          confirm_send_all: Are you sure you want to send these ordergroup invoices to %{ordergroups}?
+          delete: delete invoice
+          download: download invoice
+          download_all_zip: download all invoices as zip
+          generate: generate invoice
+          generate_with_date: set & generate
+          invoice_date: date of group order invoice
+          invoice_number: invoice number
+          ordergroup: Ordergroup
+          paid: paid
+          not_paid: unpaid
+          send_all_by_email: send all invoices
+          send_all_success: Invoices were sent to all ordergroups
+          sepa_downloaded: SEPA exported
+          sepa_not_downloaded: SEPA not exported
+          sepa_not_ready: Configurations for SEPA are missing in Admin->Settings->Finances
+          sepa_select: mark for SEPA export
+          sepa_sequence_type: SEPA type
+        open_details_modal: Toggle details
+        payment_method: Credit
+        tax_number_not_set: Tax number not set in configs or no ordergroup present
+
+  documents:
+    group_order_invoice_pdf:
+      ordergroup:
+        contact_phone: 'Phone: %{contact_phone}'
+        contact_address: 'Address: %{contact_address}'
+        customer_number: 'Customer number: %{customer_number}'
+        name: 'Ordergroup: %{ordergroup}'
+      filename: Invoice%{number}
+      invoicee: Invoicee
+      invoicer: Invoicer
+      invoice_date: 'Invoice date: %{invoice_date}'
+      invoice_number: 'Invoice number: %{invoice_number}'
+      markup_included: incl. Foodcoop margin on gross price %{marge}%
+      payment_method: 'Payment method: %{payment_method}'
+      small_business_regulation: As a small entrepreneur in the sense of §19 para. 1 of the Umsatzsteuergesetz (UStG), no value added tax is charged.
+      sum_to_pay: Total sum
+      sum_to_pay_net: Total sum (net)
+      sum_to_pay_gross: Total sum (gross)
+      table_headline: 'The following items will be charged for the order:'
+      tax_excluded: excl. VAT
+      tax_included: incl. VAT %{tax}%
+      tax_number: 'Tax number: %{number}'
+      title: Invoice for order at %{supplier}
+      vat_exempt_rows:
+        - Name
+        - Quantity
+        - Unit price
+        - Total price
+      no_price_markup_rows:
+        - Name
+        - Quantity
+        - Unit price (net)
+        - Total price (net)
+        - VAT
+        - Total price (gross)
+      price_markup_rows:
+        - Name
+        - Quantity
+        - Unit price (net)
+        - Total price (net)
+        - VAT
+        - Total price (gross) incl. foodcoop margin
diff --git a/plugins/invoices/config/locales/nl.yml b/plugins/invoices/config/locales/nl.yml
new file mode 100644
index 000000000..e3c7d18ab
--- /dev/null
+++ b/plugins/invoices/config/locales/nl.yml
@@ -0,0 +1,79 @@
+nl:
+  activerecord:
+    attributes:
+      group_order_invoice:
+        name: Huishoudensfactuur
+        sequence_type:
+          FRST: "Eerste automatische incasso"
+          RCUR: "Terugkerende automatische incasso"
+          OOFF: "Eenmalige automatische incasso"
+          FNAL: "Laatste automatische incasso"
+        links:
+          actions_for_all: Acties voor alle bestellingen
+          delete: Factuur verwijderen
+          create_cumulative_invoice: Cumulatieve factuur maken
+          confirm_send_all: Weet je zeker dat je deze huishoudensfacturen wilt versturen naar %{ordergroups}?
+          combine: Facturen combineren
+          download: Factuur downloaden
+          download_all_zip: Alle facturen downloaden (zip)
+          generate: Factuur genereren
+          generate_with_date: Instellen & genereren
+          invoice_date: Datum van huishoudensfactuur
+          invoice_number: Factuurnummer
+          ordergroup: Huishouden
+          paid: Betaald
+          not_paid: Niet betaald
+          send_all_by_email: Alle facturen versturen
+          send_all_success: Facturen zijn naar alle huishoudens verstuurd
+          sepa_downloaded: SEPA geëxporteerd
+          sepa_not_downloaded: SEPA niet geëxporteerd
+          sepa_not_ready: Configuraties voor SEPA ontbreken in Beheer->Instellingen->Financiën
+          sepa_select: Markeren voor SEPA-export
+          sepa_sequence_type: SEPA-type
+        open_details_modal: Details tonen/verbergen
+        payment_method: Tegoed
+        tax_number_not_set: BTW-nummer niet ingesteld in configuratie of geen huishouden aanwezig
+
+  documents:
+    group_order_invoice_pdf:
+      filename: Factuur%{number}
+      invoicer: Factureerder
+      invoicee: Geadresseerde
+      invoice_date: 'Factuurdatum: %{invoice_date}'
+      invoice_number: 'Factuurnummer: %{invoice_number}'
+      markup_included: incl. Foodcoop marge op brutoprijs %{marge}%
+      ordergroup:
+        contact_phone: 'Telefoonnummer: %{contact_phone}'
+        contact_address: 'Adres: %{contact_address}'
+        customer_number: 'Klantnummer: %{customer_number}'
+        name: Huishouden %{ordergroup}
+      payment_method: 'Betaalmethode: %{payment_method}'
+      pickup_date: 'Leverdatum: %{invoice_date}'
+      sum_to_pay: Totaal te betalen
+      sum_to_pay_net: Totaal te betalen (netto)
+      sum_to_pay_gross: Totaal
+      small_business_regulation: Als kleine ondernemer in de zin van §19 lid 1 van de Umsatzsteuergesetz (UStG) wordt geen BTW in rekening gebracht.
+      table_headline: 'Voor de bestelling worden de volgende items in rekening gebracht:'
+      tax_excluded: excl. BTW
+      tax_included: incl. BTW %{tax}%
+      tax_number: 'BTW-nummer: %{number}'
+      title: Factuur voor bestelling bij %{supplier}
+      vat_exempt_rows:
+        - Naam
+        - Aantal
+        - Eenheidsprijs
+        - Totaalprijs artikel
+      no_price_markup_rows:
+        - Naam
+        - Aantal
+        - Eenheidsprijs (netto)
+        - Totaalprijs artikel (netto)
+        - BTW
+        - Totaalprijs artikel (bruto)
+      price_markup_rows:
+        - Naam
+        - Aantal
+        - Eenheidsprijs (netto)
+        - Totaalprijs artikel (netto)
+        - BTW
+        - Totaalprijs artikel (bruto) incl. Foodcoop marge %{marge}%
\ No newline at end of file
diff --git a/plugins/invoices/config/routes.rb b/plugins/invoices/config/routes.rb
new file mode 100644
index 000000000..6e4f5f92b
--- /dev/null
+++ b/plugins/invoices/config/routes.rb
@@ -0,0 +1,16 @@
+Rails.application.routes.draw do
+  scope '/:foodcoop' do
+    post 'finance/group_order_invoice', to: 'group_order_invoices#create_multiple'
+
+    resources :group_order_invoices do
+      member do
+        patch :toggle_paid
+      end
+      collection do
+        get :download_within_date
+        patch :toggle_all_paid
+        get :download_all
+      end
+    end
+  end
+end
diff --git a/plugins/invoices/db/migrate/20240101000000_create_group_order_invoices.rb b/plugins/invoices/db/migrate/20240101000000_create_group_order_invoices.rb
new file mode 100644
index 000000000..a4554378e
--- /dev/null
+++ b/plugins/invoices/db/migrate/20240101000000_create_group_order_invoices.rb
@@ -0,0 +1,16 @@
+class CreateGroupOrderInvoices < ActiveRecord::Migration[7.0]
+  def change
+    create_table :group_order_invoices do |t|
+      t.integer :group_order_id
+      t.bigint :invoice_number, unique: true, limit: 8
+      t.date :invoice_date
+      t.string :payment_method
+      t.boolean :paid, default: false, null: false
+      t.boolean :sepa_downloaded, default: false, null: false
+      t.string :sepa_sequence_type, default: 'RCUR'
+
+      t.timestamps
+    end
+    add_index :group_order_invoices, :group_order_id, unique: true
+  end
+end
diff --git a/plugins/invoices/foodsoft_invoices.gemspec b/plugins/invoices/foodsoft_invoices.gemspec
new file mode 100644
index 000000000..2182b0e38
--- /dev/null
+++ b/plugins/invoices/foodsoft_invoices.gemspec
@@ -0,0 +1,25 @@
+$:.push File.expand_path('lib', __dir__)
+
+# Maintain your gem's version:
+require 'foodsoft_invoices/version'
+
+# Describe your gem and declare its dependencies:
+Gem::Specification.new do |s|
+  s.name        = 'foodsoft_invoices'
+  s.version     = FoodsoftInvoices::VERSION
+  s.authors     = %w[Viehlieb Robert]
+  s.email       = ['rw@roko.li']
+  s.homepage    = 'https://github.com/foodcoops/foodsoft'
+  s.summary     = 'Invoice plugin for foodsoft.'
+  s.description = 'Adds comprehensive invoice functionality to foodsoft.'
+  s.required_ruby_version = '>= 2.7'
+
+  s.files = Dir['{app,config,db,lib}/**/*'] + ['Rakefile', 'README.md']
+
+  s.add_dependency 'rails'
+  s.add_dependency 'deface', '~> 1.0'
+  s.add_dependency 'prawn'
+  s.add_dependency 'prawn-table'
+
+  s.metadata['rubygems_mfa_required'] = 'true'
+end
diff --git a/plugins/invoices/lib/foodsoft_invoices.rb b/plugins/invoices/lib/foodsoft_invoices.rb
new file mode 100644
index 000000000..dfd5ad2cf
--- /dev/null
+++ b/plugins/invoices/lib/foodsoft_invoices.rb
@@ -0,0 +1,10 @@
+require 'foodsoft_invoices/engine'
+require 'deface'
+
+module FoodsoftInvoices
+  # Return whether invoices are used or not.
+  # Disabled by default in {FoodsoftConfig}.
+  def self.enabled?
+    FoodsoftConfig[:use_invoices]
+  end
+end
diff --git a/plugins/invoices/lib/foodsoft_invoices/engine.rb b/plugins/invoices/lib/foodsoft_invoices/engine.rb
new file mode 100644
index 000000000..489ff14ce
--- /dev/null
+++ b/plugins/invoices/lib/foodsoft_invoices/engine.rb
@@ -0,0 +1,15 @@
+module FoodsoftInvoices
+  class Engine < ::Rails::Engine
+    config.to_prepare do
+      if FoodsoftInvoices.enabled?
+        Foodsoft::AssetRegistry.register_stylesheet('foodsoft_invoices')
+        Foodsoft::AssetRegistry.register_javascript('foodsoft_invoices')
+        GroupOrder.include GroupOrderExtensions
+      end
+    end
+
+    def default_foodsoft_config(cfg)
+      cfg[:use_invoices] = false
+    end
+  end
+end
diff --git a/plugins/invoices/lib/foodsoft_invoices/version.rb b/plugins/invoices/lib/foodsoft_invoices/version.rb
new file mode 100644
index 000000000..5137727de
--- /dev/null
+++ b/plugins/invoices/lib/foodsoft_invoices/version.rb
@@ -0,0 +1,3 @@
+module FoodsoftInvoices
+  VERSION = '0.0.1'
+end
diff --git a/plugins/invoices/spec/documents/group_order_invoice_pdf_spec.rb b/plugins/invoices/spec/documents/group_order_invoice_pdf_spec.rb
new file mode 100644
index 000000000..ce3214008
--- /dev/null
+++ b/plugins/invoices/spec/documents/group_order_invoice_pdf_spec.rb
@@ -0,0 +1,95 @@
+require 'spec_helper'
+
+describe GroupOrderInvoicePdf do
+  let(:user) { create(:user, groups: [create(:ordergroup)]) }
+  let(:supplier) { create(:supplier, name: 'Test Supplier') }
+  let(:article) { create(:article, supplier: supplier) }
+  let(:order) { create(:order, supplier: supplier, article_ids: [article.id]) }
+  let(:group_order) { create(:group_order, order: order, ordergroup: user.ordergroup) }
+  let(:invoice_number) { 2_025_072_900_001 }
+  let(:invoice_date) { Date.new(2025, 7, 29) }
+
+  before do
+    FoodsoftConfig[:contact] = {
+      street: 'Test Street 123',
+      zip_code: '12345',
+      city: 'Test City',
+      email: 'test@example.com',
+      phone: '123-456-7890',
+      tax_number: '123456789'
+    }
+  end
+
+  describe '#filename' do
+    it 'returns the correct filename' do
+      pdf = described_class.new(
+        ordergroup: user.ordergroup,
+        invoice_number: invoice_number
+      )
+
+      expected_filename = "#{user.ordergroup.name}_" +
+                          I18n.t('documents.group_order_invoice_pdf.filename', number: invoice_number) +
+                          '.pdf'
+
+      expect(pdf.filename).to eq(expected_filename)
+    end
+  end
+
+  describe '#title' do
+    it 'returns the correct title' do
+      pdf = described_class.new(
+        supplier: supplier.name
+      )
+
+      expected_title = I18n.t('documents.group_order_invoice_pdf.title', supplier: supplier.name)
+
+      expect(pdf.title).to eq(expected_title)
+    end
+  end
+
+  describe '#body' do
+    context 'with VAT exempt configuration' do
+      before do
+        FoodsoftConfig[:group_order_invoices] = { vat_exempt: true }
+      end
+
+      it 'calls body_for_vat_exempt method' do
+        pdf = described_class.new(
+          ordergroup: user.ordergroup,
+          supplier: supplier.name,
+          invoice_number: invoice_number,
+          invoice_date: invoice_date,
+          group_order_ids: [group_order.id],
+          tax_number: FoodsoftConfig[:contact][:tax_number],
+          payment_method: 'Cash'
+        )
+
+        allow(pdf).to receive(:body_for_vat_exempt)
+        pdf.body
+        expect(pdf).to have_received(:body_for_vat_exempt)
+      end
+    end
+
+    context 'with VAT included configuration' do
+      before do
+        FoodsoftConfig[:group_order_invoices] = { vat_exempt: false }
+      end
+
+      it 'calls body_with_vat method' do
+        pdf = described_class.new(
+          ordergroup: user.ordergroup,
+          supplier: supplier.name,
+          invoice_number: invoice_number,
+          invoice_date: invoice_date,
+          group_order_ids: [group_order.id],
+          tax_number: FoodsoftConfig[:contact][:tax_number],
+          payment_method: 'Cash'
+        )
+
+        allow(pdf).to receive(:body_with_vat)
+        pdf.body
+        expect(pdf).to have_received(:body_with_vat)
+      end
+    end
+  end
+end
diff --git a/plugins/invoices/spec/models/group_order_invoice_spec.rb b/plugins/invoices/spec/models/group_order_invoice_spec.rb
new file mode 100644
index 000000000..793566223
--- /dev/null
+++ b/plugins/invoices/spec/models/group_order_invoice_spec.rb
@@ -0,0 +1,56 @@
+require 'spec_helper'
+
+describe GroupOrderInvoice do
+  let(:user) { create(:user, groups: [create(:ordergroup)]) }
+  let(:supplier) { create(:supplier) }
+  let(:article) { create(:article, supplier: supplier) }
+  let(:order) { create(:order, supplier: supplier, article_ids: [article.id]) }
+  let(:group_order) { create(:group_order, order: order, ordergroup: user.ordergroup) }
+
+  describe 'erroneous group order invoice' do
+    it 'does not create group order invoice if tax_number not set' do
+      expect { described_class.create!(group_order_id: group_order.id) }.to raise_error(ActiveRecord::RecordInvalid, /.*/)
+    end
+  end
+
+  describe 'valid group order invoice' do
+    before do
+      FoodsoftConfig[:contact][:tax_number] = 123_457_8
+    end
+
+    invoice_number1 = Time.now.strftime('%Y%m%d') + '0001'
+    invoice_number2 = Time.now.strftime('%Y%m%d') + '0002'
+
+    let(:user2) { create(:user, groups: [create(:ordergroup)]) }
+    let(:group_order2) { create(:group_order, order: order, ordergroup: user2.ordergroup) }
+
+    it 'creates group order invoice if tax_number is set' do
+      goi = described_class.new(group_order_id: group_order.id)
+      expect(goi).to be_valid
+    end
+
+    it 'sets invoice_number according to date' do
+      goi = described_class.create!(group_order_id: group_order.id)
+      number = Time.now.strftime('%Y%m%d') + '0001'
+      expect(goi.invoice_number).to eq(number.to_i)
+    end
+
+    it 'fails to create if group_order_id is used multiple times for creation' do
+      goi1 = described_class.create!(group_order_id: group_order.id)
+      expect(goi1.group_order.id).to eq(group_order.id)
+      expect { described_class.create!(group_order_id: group_order.id) }.to raise_error(ActiveRecord::RecordInvalid)
+    end
+
+    it 'creates two different group order invoice with different invoice_numbers' do
+      goi1 = described_class.create!(group_order_id: group_order.id)
+      goi3 = described_class.create!(group_order_id: group_order2.id)
+      expect(goi1.invoice_number).to eq(invoice_number1.to_i)
+      expect(goi3.invoice_number).to eq(invoice_number2.to_i)
+    end
+
+    it 'fails to create two different group order invoice with same invoice_numbers' do
+      described_class.create!(group_order_id: group_order.id)
+      expect { described_class.create!(group_order_id: group_order2.id, invoice_number: invoice_number1.to_i) }.to raise_error(ActiveRecord::RecordInvalid)
+    end
+  end
+end