diff --git a/app/controllers/registrar/account_controller.rb b/app/controllers/registrar/account_controller.rb
index 9252098b8..0bb40ae3c 100644
--- a/app/controllers/registrar/account_controller.rb
+++ b/app/controllers/registrar/account_controller.rb
@@ -1,6 +1,7 @@
 class Registrar
   class AccountController < BaseController
     skip_authorization_check
+    helper_method :iban_max_length
 
     def show; end
 
@@ -20,5 +21,9 @@ class Registrar
     def registrar_params
       params.require(:registrar).permit(:billing_email, :iban)
     end
+
+    def iban_max_length
+      Iban.max_length
+    end
   end
 end
\ No newline at end of file
diff --git a/app/views/registrar/account/_form.html.erb b/app/views/registrar/account/_form.html.erb
index 7a7e4491b..ab1fb0294 100644
--- a/app/views/registrar/account/_form.html.erb
+++ b/app/views/registrar/account/_form.html.erb
@@ -17,7 +17,8 @@
         </div>
 
         <div class="col-sm-4">
-            <%= f.text_field :iban, class: 'form-control' %>
+            <%= f.text_field :iban, maxlength: iban_max_length, class: 'form-control' %>
+            <span class="help-block"><%= t '.iban_hint' %></span>
         </div>
     </div>
 
diff --git a/config/locales/registrar/account.en.yml b/config/locales/registrar/account.en.yml
index 94d4783d5..a4f3f8f2a 100644
--- a/config/locales/registrar/account.en.yml
+++ b/config/locales/registrar/account.en.yml
@@ -8,6 +8,7 @@ en:
         header: Edit your account
 
       form:
+        iban_hint: Required for sending e-invoices to the bank
         submit_btn: Save changes
 
       update: