diff --git a/configuration.py b/configuration.py
index 5570483..a6d063c 100644
--- a/configuration.py
+++ b/configuration.py
@@ -25,6 +25,9 @@ class Configuration(metaclass=PoolMeta):
         string='Accept other company',
         help='Accepts invoices created for a company other ' +
         'than the current one.')
+    accept_incomplete_tax = fields.Boolean(
+        string='Incomplete tax data',
+        help='Accepts incomplete data in the taxes of invoice lines.')
     number_target = fields.Selection(
         string='Invoice number',
         help='Destination for the invoice number of the supplier invoice.',
@@ -35,6 +38,15 @@ class Configuration(metaclass=PoolMeta):
         'on an invoice line.',
         relation_name='document.incoming.confprodcat_rel')
 
+    @classmethod
+    def default_accept_incomplete_tax(cls):
+        """ allow tax on invoice-line by percent, without 'VAT'-type
+
+        Returns:
+            bool: True
+        """
+        return True
+
     @classmethod
     def default_number_target(cls):
         """ targetfield for incoming invoice number
diff --git a/locale/de.po b/locale/de.po
index 396b479..67a498c 100644
--- a/locale/de.po
+++ b/locale/de.po
@@ -90,6 +90,13 @@ msgctxt "help:document.incoming.configuration,product_category:"
 msgid "Categories used to determine tax and accounts for a product on an invoice line."
 msgstr "Kategorien zur Ermittlung von Steuer und Konten für ein Produkt auf einer Rechnungszeile."
 
+msgctxt "field:document.incoming.configuration,accept_incomplete_tax:"
+msgid "Incomplete tax data"
+msgstr "unvollständige Steuerdaten"
+
+msgctxt "help:document.incoming.configuration,accept_incomplete_tax:"
+msgid "Accepts incomplete data in the taxes of invoice lines."
+msgstr "Akzeptiert unvollständige Daten bei den Steuern der Rechnungszeilen."
 
 
 #####################################
diff --git a/locale/en.po b/locale/en.po
index 24dbbdf..bf94302 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -82,6 +82,14 @@ msgctxt "help:document.incoming.configuration,product_category:"
 msgid "Categories used to determine tax and accounts for a product on an invoice line."
 msgstr "Categories used to determine tax and accounts for a product on an invoice line."
 
+msgctxt "field:document.incoming.configuration,accept_incomplete_tax:"
+msgid "Incomplete tax data"
+msgstr "Incomplete tax data"
+
+msgctxt "help:document.incoming.configuration,accept_incomplete_tax:"
+msgid "Accepts incomplete data in the taxes of invoice lines."
+msgstr "Accepts incomplete data in the taxes of invoice lines."
+
 msgctxt "model:document.incoming.confprodcat_rel:"
 msgid "Configuration - Product Category - Relation"
 msgstr "Configuration - Product Category - Relation"
@@ -97,3 +105,4 @@ msgstr "Category"
 msgctxt "field:document.incoming,xsd_type:"
 msgid "Content Data"
 msgstr "Content Data"
+
diff --git a/view/document_incoming_configuration_form.xml b/view/document_incoming_configuration_form.xml
index fcc366b..22fe20b 100644
--- a/view/document_incoming_configuration_form.xml
+++ b/view/document_incoming_configuration_form.xml
@@ -11,6 +11,8 @@
         <field name="create_supplier"/>
         <label name="accept_other_company"/>
         <field name="accept_other_company"/>
+        <label name="accept_incomplete_tax"/>
+        <field name="accept_incomplete_tax"/>
 
         <field name="product_category" colspan="4"/>