diff --git a/app/controllers/finance/bank_accounts_controller.rb b/app/controllers/finance/bank_accounts_controller.rb
index 943fe400..a2aba712 100644
--- a/app/controllers/finance/bank_accounts_controller.rb
+++ b/app/controllers/finance/bank_accounts_controller.rb
@@ -5,6 +5,14 @@ class Finance::BankAccountsController < Finance::BaseController
     redirect_to finance_bank_account_transactions_url(@bank_accounts.first) if @bank_accounts.count == 1
   end
 
+  def assign_unlinked_transactions
+    @bank_account = BankAccount.find(params[:id])
+    count = @bank_account.assign_unlinked_transactions
+    redirect_to finance_bank_account_transactions_url(@bank_account), notice: t('finance.bank_accounts.controller.assign.notice', count: count)
+  rescue => error
+    redirect_to finance_bank_account_transactions_url(@bank_account), alert: t('errors.general_msg', msg: error.message)
+  end
+
   def import
     @bank_account = BankAccount.find(params[:id])
     import_method = @bank_account.find_import_method
diff --git a/app/models/bank_account.rb b/app/models/bank_account.rb
index 0351173b..baf2e9c7 100644
--- a/app/models/bank_account.rb
+++ b/app/models/bank_account.rb
@@ -12,4 +12,14 @@ class BankAccount < ApplicationRecord
   # @return [Function] Method wich can be called to import transaction from a bank or nil if unsupported
   def find_import_method
   end
+
+  def assign_unlinked_transactions
+    count = 0
+    bank_transactions.without_financial_link.includes(:supplier, :user).each do |t|
+      if t.assign_to_ordergroup || t.assign_to_invoice
+        count += 1
+      end
+    end
+    count
+  end
 end
diff --git a/app/models/bank_transaction.rb b/app/models/bank_transaction.rb
index f2968817..5cb7b447 100644
--- a/app/models/bank_transaction.rb
+++ b/app/models/bank_transaction.rb
@@ -33,4 +33,48 @@ class BankTransaction < ApplicationRecord
   def image_url
     'data:image/png;base64,' + Base64.encode64(self.image)
   end
+
+  def assign_to_invoice
+    return false unless supplier
+
+    content = text
+    content += "\n" + reference if reference.present?
+    invoices = supplier.invoices.unpaid.select {|i| content.include? i.number}
+    invoices_sum = invoices.map(&:amount).sum
+    return false if amount != -invoices_sum
+
+    transaction do
+      link = FinancialLink.new
+      invoices.each {|i| i.update_attributes! financial_link: link, paid_on: date }
+      update_attribute :financial_link, link
+    end
+
+    return true
+  end
+
+  def assign_to_ordergroup
+    m = BankTransactionReference.parse(reference)
+    return unless m
+
+    return false if m[:parts].values.sum != amount
+    group = Ordergroup.find_by_id(m[:group])
+    return false unless group
+    usr = m[:user] ? User.find_by_id(m[:user]) : group.users.first
+    return false unless usr
+
+    transaction do
+      note = "ID=#{id} (#{amount})"
+      link = FinancialLink.new
+
+      m[:parts].each do |short, value|
+        ftt = FinancialTransactionType.find_by_name_short(short)
+        return false unless ftt
+        group.add_financial_transaction! value, note, usr, ftt, link if value > 0
+      end
+
+      update_attribute :financial_link, link
+    end
+
+    return true
+  end
 end
diff --git a/app/views/finance/bank_transactions/index.html.haml b/app/views/finance/bank_transactions/index.html.haml
index 845cecd8..1d3dee1a 100644
--- a/app/views/finance/bank_transactions/index.html.haml
+++ b/app/views/finance/bank_transactions/index.html.haml
@@ -1,6 +1,7 @@
 - title t('.title', name: @bank_account.name, balance: number_to_currency(@bank_account.balance))
 
 - content_for :actionbar do
+  = link_to t('.assign_unlinked_transactions'), assign_unlinked_transactions_finance_bank_account_path(@bank_account), class: 'btn'
   = link_to t('.import_transaction'), import_finance_bank_account_path(@bank_account), class: 'btn btn-primary'
 
 .well.well-small
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 75fd9886..7acc35dc 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -775,6 +775,8 @@ en:
         without_extra_charge: 'without extra charge:'
     bank_accounts:
       controller:
+        assign:
+          notice: '%{count} transactions have been assigned'
         import:
           notice: '%{count} new transactions have been imported'
       index:
diff --git a/config/routes.rb b/config/routes.rb
index 87338884..93e88e31 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -195,6 +195,7 @@ Foodsoft::Application.routes.draw do
 
       resources :bank_accounts, only: [:index] do
         member do
+          get :assign_unlinked_transactions
           get :import
         end
 
diff --git a/lib/bank_transaction_reference.rb b/lib/bank_transaction_reference.rb
new file mode 100644
index 00000000..71470b31
--- /dev/null
+++ b/lib/bank_transaction_reference.rb
@@ -0,0 +1,20 @@
+class BankTransactionReference
+
+  # parses a string from a bank transaction field
+  def self.parse(data)
+    m = /(^|\s)FS(?<group>\d+)(\.(?<user>\d+))?(?<parts>([A-Za-z]+\d+(\.\d+)?)+)(\s|$)/.match(data)
+    return unless m
+
+    parts = {}
+    m[:parts].scan(/([A-Za-z]+)(\d+(\.\d+)?)/) do |category, value|
+      value = value.to_f
+      value += parts[category] if parts[category]
+      parts[category] = value
+    end
+
+    ret = { group: m[:group], parts: parts }
+    ret[:user] = m[:user] if m[:user]
+    return ret
+  end
+
+end
diff --git a/spec/factories/bank_transaction_type.rb b/spec/factories/bank_transaction_type.rb
new file mode 100644
index 00000000..66da3550
--- /dev/null
+++ b/spec/factories/bank_transaction_type.rb
@@ -0,0 +1,15 @@
+require 'factory_bot'
+
+FactoryBot.define do
+
+  factory :bank_account do
+    name { Faker::Bank.name }
+    iban { Faker::Bank.iban }
+  end
+
+  factory :bank_transaction do
+    date { Faker::Date.backward(days: 14) }
+    text { Faker::Lorem.sentence }
+  end
+
+end
diff --git a/spec/factories/invoice.rb b/spec/factories/invoice.rb
new file mode 100644
index 00000000..d43af28a
--- /dev/null
+++ b/spec/factories/invoice.rb
@@ -0,0 +1,15 @@
+require 'factory_bot'
+
+FactoryBot.define do
+
+  factory :invoice do
+    supplier
+    number { rand(1..99999) }
+    amount { rand(0.1..26.0).round(2) }
+
+    after :create do |invoice|
+      invoice.supplier.reload
+    end
+  end
+
+end
diff --git a/spec/lib/bank_transaction_reference_spec.rb b/spec/lib/bank_transaction_reference_spec.rb
new file mode 100644
index 00000000..6e9c8996
--- /dev/null
+++ b/spec/lib/bank_transaction_reference_spec.rb
@@ -0,0 +1,60 @@
+require_relative '../spec_helper'
+
+describe BankTransactionReference do
+  it 'returns nil for empty input' do
+    expect(BankTransactionReference.parse('')).to be nil
+  end
+
+  it 'returns nil for invalid string' do
+    expect(BankTransactionReference.parse('invalid')).to be nil
+  end
+
+  it 'returns nil for FS1A' do
+    expect(BankTransactionReference.parse('FS1A')).to be nil
+  end
+
+  it 'returns nil for FS1.1A' do
+    expect(BankTransactionReference.parse('FS1.1A')).to be nil
+  end
+
+  it 'returns nil for xFS1A1' do
+    expect(BankTransactionReference.parse('xFS1A1')).to be nil
+  end
+
+  it 'returns nil for FS1A1x' do
+    expect(BankTransactionReference.parse('FS1A1x')).to be nil
+  end
+
+  it 'returns correct value for FS1A1' do
+    expect(BankTransactionReference.parse('FS1A1')).to be { { group: 1, parts: { A: 1 } } }
+  end
+
+  it 'returns correct value for FS1A1' do
+    expect(BankTransactionReference.parse('FS1.2A3')).to be { { group: 1, user: 2, parts: { A: 3 } } }
+  end
+
+  it 'returns correct value for FS1A2B3' do
+    expect(BankTransactionReference.parse('FS1A2B3C4')).to be { { group: 1, parts: { A: 2, B: 3, C: 4 } } }
+  end
+
+  it 'returns correct value for FS1A2B3A4' do
+    expect(BankTransactionReference.parse('FS1A2B3C4')).to be { { group: 1, parts: { A: 6, B: 3 } } }
+  end
+
+  it 'returns correct value for FS1A2.34B5.67C8.90' do
+    expect(BankTransactionReference.parse('FS1A2B3C4')).to be { { group: 1, parts: { A: 2.34, B: 5.67, C: 8.90 } } }
+  end
+
+  it 'returns correct value for FS123A456 with prefix' do
+    expect(BankTransactionReference.parse('x FS123A456')).to be { { group: 123, parts: { A: 456 } } }
+  end
+
+  it 'returns correct value for FS234A567 with suffix' do
+    expect(BankTransactionReference.parse('FS234A567 x')).to be { { group: 234, parts: { A: 567 } } }
+  end
+
+  it 'returns correct value for FS34.56A67.89 with prefix and suffix' do
+    expect(BankTransactionReference.parse('x FS34.56A67.89 x')).to be { { group: 34, user: 56, parts: { A: 67.89 } } }
+  end
+
+end
diff --git a/spec/models/bank_transaction_spec.rb b/spec/models/bank_transaction_spec.rb
new file mode 100644
index 00000000..21d3458f
--- /dev/null
+++ b/spec/models/bank_transaction_spec.rb
@@ -0,0 +1,108 @@
+require_relative '../spec_helper'
+
+describe BankTransaction do
+  let(:bank_account) { create :bank_account }
+  let(:ordergroup) { create :ordergroup }
+  let(:supplier) { create :supplier, iban: Faker::Bank.iban }
+  let!(:user) { create :user, groups: [ordergroup] }
+  let!(:ftt_a) { create :financial_transaction_type, name_short: 'A' }
+  let!(:ftt_b) { create :financial_transaction_type, name_short: 'B' }
+
+  describe 'supplier' do
+    let!(:invoice1) { create :invoice, supplier: supplier, number: '11', amount: 10 }
+    let!(:invoice2) { create :invoice, supplier: supplier, number: '22', amount: 20 }
+    let!(:invoice3) { create :invoice, supplier: supplier, number: '33', amount: 30 }
+    let!(:invoice4) { create :invoice, supplier: supplier, number: '44', amount: 40 }
+    let!(:invoice5) { create :invoice, supplier: supplier, number: '55', amount: 50 }
+
+    let!(:bank_transaction1) { create :bank_transaction, bank_account: bank_account, iban: supplier.iban, reference: '11', amount: 10 }
+    let!(:bank_transaction2) { create :bank_transaction, bank_account: bank_account, iban: supplier.iban, reference: '22', amount: -20 }
+    let!(:bank_transaction3) { create :bank_transaction, bank_account: bank_account, iban: supplier.iban, reference: '33,44', amount: -70 }
+    let!(:bank_transaction4) { create :bank_transaction, bank_account: bank_account, iban: supplier.iban, text: '55', amount: -50 }
+
+    it 'ignores invoices with invalid amount' do
+      expect(bank_transaction1.assign_to_invoice).to be false
+    end
+
+    it 'can assign single invoice' do
+      expect(bank_transaction2.assign_to_invoice).to be true
+      invoice2.reload
+      expect(invoice2.paid_on).to eq bank_transaction2.date
+      expect(invoice2.financial_link).to eq bank_transaction2.financial_link
+    end
+
+    it 'can assign multiple invoice' do
+      expect(bank_transaction3.assign_to_invoice).to be true
+      [invoice3, invoice4].each(&:reload)
+      expect(invoice3.paid_on).to eq bank_transaction3.date
+      expect(invoice4.paid_on).to eq bank_transaction3.date
+      expect(invoice3.financial_link).to eq bank_transaction3.financial_link
+      expect(invoice4.financial_link).to eq bank_transaction3.financial_link
+    end
+
+    it 'can assign single invoice with number in text' do
+      expect(bank_transaction4.assign_to_invoice).to be true
+      invoice5.reload
+      expect(invoice5.paid_on).to eq bank_transaction4.date
+      expect(invoice5.financial_link).to eq bank_transaction4.financial_link
+    end
+
+  end
+
+  describe 'ordergroup' do
+    let!(:bank_transaction1) { create :bank_transaction, bank_account: bank_account, reference: "invalid", amount: 10 }
+    let!(:bank_transaction2) { create :bank_transaction, bank_account: bank_account, reference: "FS99A10", amount: 10 }
+    let!(:bank_transaction3) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}.99A10", amount: 10 }
+    let!(:bank_transaction4) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}A10", amount: 99 }
+    let!(:bank_transaction5) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}A10", amount: 10 }
+    let!(:bank_transaction6) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}A10B20", amount: 30 }
+    let!(:bank_transaction7) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}.#{user.id}A10", amount: 10 }
+    let!(:bank_transaction8) { create :bank_transaction, bank_account: bank_account, reference: "FS#{ordergroup.id}X10", amount: 10 }
+
+    it 'ignores transaction with invalid reference' do
+      expect(bank_transaction1.assign_to_ordergroup).to be nil
+    end
+
+    it 'ignores transaction with invalid ordergroup' do
+      expect(bank_transaction2.assign_to_ordergroup).to be false
+    end
+
+    it 'ignores transaction with invalid user' do
+      expect(bank_transaction3.assign_to_ordergroup).to be false
+    end
+
+    it 'ignores transaction with invalid sum' do
+      expect(bank_transaction4.assign_to_ordergroup).to be false
+    end
+
+    it 'add transaction with one part' do
+      expect(bank_transaction5.assign_to_ordergroup).to be true
+      ft_a = user.ordergroup.financial_transactions.where(financial_transaction_type: ftt_a).first
+      expect(ft_a.amount).to eq 10
+      expect(ft_a.financial_link).to eq bank_transaction5.financial_link
+    end
+
+    it 'add transaction with multiple parts' do
+      expect(bank_transaction6.assign_to_ordergroup).to be true
+      ft_a = user.ordergroup.financial_transactions.where(financial_transaction_type: ftt_a).first
+      ft_b = user.ordergroup.financial_transactions.where(financial_transaction_type: ftt_b).first
+      expect(ft_a.amount).to eq 10
+      expect(ft_a.financial_link).to eq bank_transaction6.financial_link
+      expect(ft_b.amount).to eq 20
+      expect(ft_b.financial_link).to eq bank_transaction6.financial_link
+    end
+
+    it 'add transaction with one part and user' do
+      expect(bank_transaction7.assign_to_ordergroup).to be true
+      ft_a = user.ordergroup.financial_transactions.where(financial_transaction_type: ftt_a).first
+      expect(ft_a.amount).to eq 10
+      expect(ft_a.financial_link).to eq bank_transaction7.financial_link
+    end
+
+    it 'ignores transaction with invalid short name' do
+      expect(bank_transaction8.assign_to_ordergroup).to be false
+    end
+
+  end
+
+end