diff --git a/src/pretix/api/serializers/event.py b/src/pretix/api/serializers/event.py
index bcd5f26c05..2dc80fa858 100644
--- a/src/pretix/api/serializers/event.py
+++ b/src/pretix/api/serializers/event.py
@@ -528,6 +528,7 @@ class EventSettingsSerializer(serializers.Serializer):
         'invoice_address_vatid',
         'invoice_address_company_required',
         'invoice_address_beneficiary',
+        'invoice_address_custom_field',
         'invoice_name_required',
         'invoice_address_not_asked_free',
         'invoice_show_payments',
diff --git a/src/pretix/base/forms/questions.py b/src/pretix/base/forms/questions.py
index f6a0213383..ddec765dea 100644
--- a/src/pretix/base/forms/questions.py
+++ b/src/pretix/base/forms/questions.py
@@ -457,7 +457,7 @@ class BaseInvoiceAddressForm(forms.ModelForm):
     class Meta:
         model = InvoiceAddress
         fields = ('is_business', 'company', 'name_parts', 'street', 'zipcode', 'city', 'country', 'state',
-                  'vat_id', 'internal_reference', 'beneficiary')
+                  'vat_id', 'internal_reference', 'beneficiary', 'custom_field')
         widgets = {
             'is_business': BusinessBooleanRadio,
             'street': forms.Textarea(attrs={
@@ -561,6 +561,11 @@ class BaseInvoiceAddressForm(forms.ModelForm):
         if not event.settings.invoice_address_beneficiary:
             del self.fields['beneficiary']
 
+        if event.settings.invoice_address_custom_field:
+            self.fields['custom_field'].label = event.settings.invoice_address_custom_field
+        else:
+            del self.fields['custom_field']
+
         for k, v in self.fields.items():
             if v.widget.attrs.get('autocomplete') or k == 'name_parts':
                 v.widget.attrs['autocomplete'] = 'section-invoice billing ' + v.widget.attrs.get('autocomplete', '')
diff --git a/src/pretix/base/invoice.py b/src/pretix/base/invoice.py
index de6cec8da4..8306f92ea1 100644
--- a/src/pretix/base/invoice.py
+++ b/src/pretix/base/invoice.py
@@ -459,6 +459,12 @@ class ClassicInvoiceRenderer(BaseReportlabInvoiceRenderer):
 
     def _get_intro(self):
         story = []
+        if self.invoice.custom_field:
+            story.append(Paragraph(
+                '{}: {}'.format(self.invoice.event.settings.invoice_address_custom_field, self.invoice.custom_field),
+                self.stylesheet['Normal']
+            ))
+
         if self.invoice.internal_reference:
             story.append(Paragraph(
                 pgettext('invoice', 'Customer reference: {reference}').format(reference=self.invoice.internal_reference),
diff --git a/src/pretix/base/migrations/0144_invoiceaddress_custom_field.py b/src/pretix/base/migrations/0144_invoiceaddress_custom_field.py
new file mode 100644
index 0000000000..e29b5a9976
--- /dev/null
+++ b/src/pretix/base/migrations/0144_invoiceaddress_custom_field.py
@@ -0,0 +1,22 @@
+# Generated by Django 2.2.9 on 2020-02-18 08:06
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('pretixbase', '0143_auto_20200217_1211'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoiceaddress',
+            name='custom_field',
+            field=models.CharField(max_length=255, null=True, blank=True),
+        ),
+        migrations.AddField(
+            model_name='invoice',
+            name='custom_field',
+            field=models.CharField(max_length=255, null=True),
+        ),
+    ]
diff --git a/src/pretix/base/models/invoices.py b/src/pretix/base/models/invoices.py
index c49fd79268..ac5679caa8 100644
--- a/src/pretix/base/models/invoices.py
+++ b/src/pretix/base/models/invoices.py
@@ -111,6 +111,7 @@ class Invoice(models.Model):
 
     file = models.FileField(null=True, blank=True, upload_to=invoice_filename, max_length=255)
     internal_reference = models.TextField(blank=True)
+    custom_field = models.CharField(max_length=255, null=True)
 
     objects = ScopedManager(organizer='event__organizer')
 
diff --git a/src/pretix/base/models/orders.py b/src/pretix/base/models/orders.py
index 8a2b7a1e9a..ec20574467 100644
--- a/src/pretix/base/models/orders.py
+++ b/src/pretix/base/models/orders.py
@@ -2094,6 +2094,7 @@ class InvoiceAddress(models.Model):
     vat_id = models.CharField(max_length=255, blank=True, verbose_name=_('VAT ID'),
                               help_text=_('Only for business customers within the EU.'))
     vat_id_validated = models.BooleanField(default=False)
+    custom_field = models.CharField(max_length=255, null=True, blank=True)
     internal_reference = models.TextField(
         verbose_name=_('Internal reference'),
         help_text=_('This reference will be printed on your invoice for your convenience.'),
diff --git a/src/pretix/base/services/invoices.py b/src/pretix/base/services/invoices.py
index 3ca827d388..20cb7e87de 100644
--- a/src/pretix/base/services/invoices.py
+++ b/src/pretix/base/services/invoices.py
@@ -85,6 +85,7 @@ def build_invoice(invoice: Invoice) -> Invoice:
                 ).split("\n") if a.strip()
             )
             invoice.internal_reference = ia.internal_reference
+            invoice.custom_field = ia.custom_field
             invoice.invoice_to_company = ia.company
             invoice.invoice_to_name = ia.name
             invoice.invoice_to_street = ia.street
diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index f0f6059c3d..79b2142c4d 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -15,7 +15,7 @@ from django.utils.translation import (
 )
 from django_countries import countries
 from hierarkey.models import GlobalSettingsBase, Hierarkey
-from i18nfield.forms import I18nFormField, I18nTextarea
+from i18nfield.forms import I18nFormField, I18nTextarea, I18nTextInput
 from i18nfield.strings import LazyI18nString
 from rest_framework import serializers
 
@@ -182,6 +182,20 @@ DEFAULTS = {
             required=False
         )
     },
+    'invoice_address_custom_field': {
+        'default': '',
+        'type': LazyI18nString,
+        'form_class': I18nFormField,
+        'serializer_class': I18nField,
+        'form_kwargs': dict(
+            label=_("Custom address field"),
+            widget=I18nTextInput,
+            help_text=_("If you want to add a custom text field, e.g. for a country-specific registration number, to "
+                        "your invoice address form, please fill in the label here. This label will both be used for "
+                        "asking the user to input their details as well as for displaying the value on the invoice. "
+                        "The field will not be required.")
+        )
+    },
     'invoice_address_vatid': {
         'default': 'False',
         'type': bool,
diff --git a/src/pretix/control/forms/event.py b/src/pretix/control/forms/event.py
index 1953d24b13..361de3e505 100644
--- a/src/pretix/control/forms/event.py
+++ b/src/pretix/control/forms/event.py
@@ -567,6 +567,7 @@ class InvoiceSettingsForm(SettingsForm):
         'invoice_address_vatid',
         'invoice_address_company_required',
         'invoice_address_beneficiary',
+        'invoice_address_custom_field',
         'invoice_name_required',
         'invoice_address_not_asked_free',
         'invoice_include_free',
diff --git a/src/pretix/control/templates/pretixcontrol/event/invoicing.html b/src/pretix/control/templates/pretixcontrol/event/invoicing.html
index 66dbf42c11..ac86284b14 100644
--- a/src/pretix/control/templates/pretixcontrol/event/invoicing.html
+++ b/src/pretix/control/templates/pretixcontrol/event/invoicing.html
@@ -29,6 +29,7 @@
                 {% bootstrap_field form.invoice_address_vatid layout="control" %}
                 {% bootstrap_field form.invoice_address_beneficiary layout="control" %}
                 {% bootstrap_field form.invoice_address_not_asked_free layout="control" %}
+                {% bootstrap_field form.invoice_address_custom_field layout="control" %}
             </fieldset>
             <fieldset>
                 <legend>{% trans "Issuer details" %}</legend>
diff --git a/src/pretix/control/templates/pretixcontrol/order/index.html b/src/pretix/control/templates/pretixcontrol/order/index.html
index 2ca5501b91..f68dd56d37 100644
--- a/src/pretix/control/templates/pretixcontrol/order/index.html
+++ b/src/pretix/control/templates/pretixcontrol/order/index.html
@@ -734,6 +734,10 @@
                                             {% endif %}
                                         </dd>
                                     {% endif %}
+                                    {% if request.event.settings.invoice_address_custom_field and order.invoice_address.custom_field %}
+                                        <dt>{{ request.event.settings.invoice_address_custom_field }}</dt>
+                                        <dd>{{ order.invoice_address.custom_field }}</dd>
+                                    {% endif %}
                                     <dt>{% trans "Internal reference" %}</dt>
                                     <dd>{{ order.invoice_address.internal_reference }}</dd>
                                 </dl>
diff --git a/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html b/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
index b926de218f..75b32691b5 100644
--- a/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
+++ b/src/pretix/presale/templates/pretixpresale/event/checkout_confirm.html
@@ -108,6 +108,10 @@
                                     <dt>{% trans "VAT ID" %}</dt>
                                     <dd>{{ addr.vat_id }}</dd>
                                 {% endif %}
+                                {% if request.event.settings.invoice_address_custom_field and addr.custom_field %}
+                                    <dt>{{ request.event.settings.invoice_address_custom_field }}</dt>
+                                    <dd>{{ addr.custom_field }}</dd>
+                                {% endif %}
                                 <dt>{% trans "Internal reference" %}</dt>
                                 <dd>{{ addr.internal_reference }}</dd>
                             </dl>
diff --git a/src/pretix/presale/templates/pretixpresale/event/order.html b/src/pretix/presale/templates/pretixpresale/event/order.html
index badf793f2c..cab26564ff 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order.html
@@ -247,6 +247,10 @@
                                     <dt>{% trans "VAT ID" %}</dt>
                                     <dd>{{ order.invoice_address.vat_id }}</dd>
                                 {% endif %}
+                                {% if request.event.settings.invoice_address_custom_field and order.invoice_address.custom_field %}
+                                    <dt>{{ request.event.settings.invoice_address_custom_field }}</dt>
+                                    <dd>{{ order.invoice_address.custom_field }}</dd>
+                                {% endif %}
                                 <dt>{% trans "Internal Reference" %}</dt>
                                 <dd>{{ order.invoice_address.internal_reference }}</dd>
                             {% endif %}