diff --git a/app/models/financial_transaction_class.rb b/app/models/financial_transaction_class.rb
index 39ba2cdb..43ded5fd 100644
--- a/app/models/financial_transaction_class.rb
+++ b/app/models/financial_transaction_class.rb
@@ -1,10 +1,14 @@
 class FinancialTransactionClass < ApplicationRecord
   has_many :financial_transaction_types, dependent: :destroy
   has_many :supplier_category, dependent: :restrict_with_exception
+  has_many :financial_transactions, through: :financial_transaction_types
+  has_many :ordergroups, -> { distinct }, through: :financial_transactions
 
   validates :name, presence: true
   validates_uniqueness_of :name
 
+  after_save :update_balance_of_ordergroups
+
   scope :sorted, -> { order(name: :asc) }
 
   def self.has_multiple_classes
@@ -18,4 +22,10 @@ class FinancialTransactionClass < ApplicationRecord
       I18n.t('activerecord.attributes.financial_transaction.amount')
     end
   end
+
+  private
+
+  def update_balance_of_ordergroups
+    ordergroups.each { |og| og.update_balance! }
+  end
 end
diff --git a/app/models/financial_transaction_type.rb b/app/models/financial_transaction_type.rb
index 62ccf3ba..392a1a95 100644
--- a/app/models/financial_transaction_type.rb
+++ b/app/models/financial_transaction_type.rb
@@ -2,6 +2,7 @@ class FinancialTransactionType < ApplicationRecord
   belongs_to :financial_transaction_class
   belongs_to :bank_account, optional: true
   has_many :financial_transactions, dependent: :restrict_with_exception
+  has_many :ordergroups, -> { distinct }, through: :financial_transactions
 
   validates :name, presence: true
   validates_uniqueness_of :name
@@ -9,6 +10,7 @@ class FinancialTransactionType < ApplicationRecord
   validates_format_of :name_short, :with => /\A[A-Za-z]*\z/
   validates :financial_transaction_class, presence: true
 
+  after_save :update_balance_of_ordergroups
   before_destroy :restrict_deleting_last_financial_transaction_type
 
   scope :with_name_short, -> { where.not(name_short: [nil, '']) }
@@ -27,4 +29,10 @@ class FinancialTransactionType < ApplicationRecord
   def restrict_deleting_last_financial_transaction_type
     raise I18n.t('model.financial_transaction_type.no_delete_last') if FinancialTransactionType.count == 1
   end
+
+  private
+
+  def update_balance_of_ordergroups
+    ordergroups.each { |og| og.update_balance! }
+  end
 end
diff --git a/app/models/ordergroup.rb b/app/models/ordergroup.rb
index 3adcf812..2a62caf5 100644
--- a/app/models/ordergroup.rb
+++ b/app/models/ordergroup.rb
@@ -103,7 +103,11 @@ class Ordergroup < Group
   end
 
   def update_balance!
-    update_attribute :account_balance, financial_transactions.sum('amount')
+    new_account_balance = financial_transactions
+      .joins(financial_transaction_type: [:financial_transaction_class])
+      .where({ financial_transaction_classes: { ignore_for_account_balance: false} })
+      .sum(:amount)
+    update_attribute :account_balance, new_account_balance
   end
 
   def avg_jobs_per_euro
diff --git a/app/views/admin/financial_transaction_classes/_form.html.haml b/app/views/admin/financial_transaction_classes/_form.html.haml
index d99e34d3..65e337ff 100644
--- a/app/views/admin/financial_transaction_classes/_form.html.haml
+++ b/app/views/admin/financial_transaction_classes/_form.html.haml
@@ -4,6 +4,7 @@
     %h3= @financial_transaction_class.new_record? ? t('.title_new') : t('.title_edit')
   .modal-body
     = f.input :name
+    = f.input :ignore_for_account_balance
   .modal-footer
     = link_to t('ui.close'), '#', class: 'btn', data: {dismiss: 'modal'}
     = f.submit class: 'btn btn-primary'
diff --git a/db/schema.rb b/db/schema.rb
index 3e0a9262..6e85c5d6 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -101,6 +101,7 @@ ActiveRecord::Schema.define(version: 2021_02_05_090257) do
 
   create_table "financial_transaction_classes", id: :integer, force: :cascade do |t|
     t.string "name", null: false
+    t.boolean "ignore_for_account_balance", default: false, null: false
   end
 
   create_table "financial_transaction_types", id: :integer, force: :cascade do |t|
diff --git a/spec/models/ordergroup_spec.rb b/spec/models/ordergroup_spec.rb
index 7f042417..07ab3d94 100644
--- a/spec/models/ordergroup_spec.rb
+++ b/spec/models/ordergroup_spec.rb
@@ -8,23 +8,51 @@ describe Ordergroup do
   let(:ftt3) { create :financial_transaction_type, financial_transaction_class: ftc2 }
   let(:user) { create :user, groups:[create(:ordergroup)] }
 
-  it 'has correct FinancialTransactionClass sums' do
-    og = user.ordergroup
-    og.add_financial_transaction!(-1, '-1', user, ftt1)
-    og.add_financial_transaction!(2, '2', user, ftt1)
-    og.add_financial_transaction!(3, '3', user, ftt1)
+  context 'with financial transactions' do
+    before do
+      og = user.ordergroup
+      og.add_financial_transaction!(-1, '-1', user, ftt1)
+      og.add_financial_transaction!(2, '2', user, ftt1)
+      og.add_financial_transaction!(3, '3', user, ftt1)
 
-    og.add_financial_transaction!(-10, '-10', user, ftt2)
-    og.add_financial_transaction!(20, '20', user, ftt2)
-    og.add_financial_transaction!(30, '30', user, ftt2)
+      og.add_financial_transaction!(-10, '-10', user, ftt2)
+      og.add_financial_transaction!(20, '20', user, ftt2)
+      og.add_financial_transaction!(30, '30', user, ftt2)
 
-    og.add_financial_transaction!(-100, '-100', user, ftt3)
-    og.add_financial_transaction!(200, '200', user, ftt3)
-    og.add_financial_transaction!(300, '300', user, ftt3)
+      og.add_financial_transaction!(-100, '-100', user, ftt3)
+      og.add_financial_transaction!(200, '200', user, ftt3)
+      og.add_financial_transaction!(300, '300', user, ftt3)
+    end
 
-    result = Ordergroup.include_transaction_class_sum.where(id: og).first
-    expect(result["sum_of_class_#{ftc1.id}"]).to eq 4
-    expect(result["sum_of_class_#{ftc2.id}"]).to eq 440
+    it 'has correct account balance' do
+      og = user.ordergroup
+      expect(og.account_balance).to eq 444
+
+      ftc1.reload
+      ftc1.update_attributes!(ignore_for_account_balance: true)
+
+      og.reload
+      expect(og.account_balance).to eq 440
+
+      ftt2.reload
+      ftt2.update_attributes!(financial_transaction_class: ftc1)
+
+      og.reload
+      expect(og.account_balance).to eq 400
+    end
+
+    it 'has correct FinancialTransactionClass sums' do
+      og = user.ordergroup
+      result = Ordergroup.include_transaction_class_sum.where(id: og).first
+      expect(result["sum_of_class_#{ftc1.id}"]).to eq 4
+      expect(result["sum_of_class_#{ftc2.id}"]).to eq 440
+
+      ftt2.reload
+      ftt2.update_attributes!(financial_transaction_class: ftc1)
+
+      result = Ordergroup.include_transaction_class_sum.where(id: og).first
+      expect(result["sum_of_class_#{ftc1.id}"]).to eq 44
+      expect(result["sum_of_class_#{ftc2.id}"]).to eq 400
+    end
   end
-
 end