diff --git a/doc/api/resources/taxrules.rst b/doc/api/resources/taxrules.rst
index 2ba9d2284c..d9f2221f88 100644
--- a/doc/api/resources/taxrules.rst
+++ b/doc/api/resources/taxrules.rst
@@ -4,7 +4,8 @@ Tax rules
 Resource description
 --------------------
 
-Tax rules specify how tax should be calculated for specific products.
+Tax rules specify how tax should be calculated for specific products. Custom taxation rulesets are currently to
+available via the API.
 
 .. rst-class:: rest-resource-table
 
diff --git a/src/pretix/base/migrations/0083_auto_20180228_2102.py b/src/pretix/base/migrations/0083_auto_20180228_2102.py
new file mode 100644
index 0000000000..70bfb85dc8
--- /dev/null
+++ b/src/pretix/base/migrations/0083_auto_20180228_2102.py
@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.10 on 2018-02-28 21:02
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0082_auto_20180222_0938'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='taxrule',
+            name='custom_rules',
+            field=models.TextField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name='orderfee',
+            name='fee_type',
+            field=models.CharField(choices=[('payment', 'Payment fee'), ('shipping', 'Shipping fee'), ('service', 'Service fee'), ('other', 'Other fees')], max_length=100),
+        ),
+    ]
diff --git a/src/pretix/base/models/tax.py b/src/pretix/base/models/tax.py
index 349abf6a40..c6f408f5b3 100644
--- a/src/pretix/base/models/tax.py
+++ b/src/pretix/base/models/tax.py
@@ -1,3 +1,4 @@
+import json
 from decimal import Decimal
 
 from django.db import models
@@ -88,6 +89,7 @@ class TaxRule(LoggedModel):
         help_text=_('Your country of residence. This is the country the EU reverse charge rule will not apply in, '
                     'if configured above.'),
     )
+    custom_rules = models.TextField(blank=True, null=True)
 
     def allow_delete(self):
         from pretix.base.models.orders import OrderFee, OrderPosition
@@ -151,7 +153,27 @@ class TaxRule(LoggedModel):
             rate=self.rate, name=self.name
         )
 
+    def get_matching_rule(self, invoice_address):
+        rules = json.loads(self.custom_rules)
+        for r in rules:
+            if r['country'] == 'EU' and str(invoice_address.country) not in EU_COUNTRIES:
+                continue
+            if r['country'] not in ('ZZ', 'EU') and r['country'] != str(invoice_address.country):
+                continue
+            if r['address_type'] == 'individual' and invoice_address.is_business:
+                continue
+            if r['address_type'] in ('business', 'business_vat_id') and not invoice_address.is_business:
+                continue
+            if r['address_type'] == 'business_vat_id' and (not invoice_address.vat_id or not invoice_address.vat_id_validated):
+                continue
+            return r
+        return {'action': 'vat'}
+
     def is_reverse_charge(self, invoice_address):
+        if self.custom_rules:
+            rule = self.get_matching_rule(invoice_address)
+            return rule['action'] == 'reverse'
+
         if not self.eu_reverse_charge:
             return False
 
@@ -170,6 +192,10 @@ class TaxRule(LoggedModel):
         return False
 
     def tax_applicable(self, invoice_address):
+        if self.custom_rules:
+            rule = self.get_matching_rule(invoice_address)
+            return rule.get('action', 'vat') == 'vat'
+
         if not self.eu_reverse_charge:
             # No reverse charge rules? Always apply VAT!
             return True
diff --git a/src/pretix/control/forms/event.py b/src/pretix/control/forms/event.py
index 046909636d..a47d6254f6 100644
--- a/src/pretix/control/forms/event.py
+++ b/src/pretix/control/forms/event.py
@@ -4,8 +4,11 @@ from django.contrib.auth.hashers import check_password
 from django.core.exceptions import ValidationError
 from django.core.validators import RegexValidator
 from django.db.models import Q
+from django.forms import formset_factory
 from django.utils.timezone import get_current_timezone_name
 from django.utils.translation import pgettext_lazy, ugettext_lazy as _
+from django_countries import Countries
+from django_countries.fields import LazyTypedChoiceField
 from i18nfield.forms import I18nFormField, I18nTextarea
 from pytz import common_timezones, timezone
 
@@ -907,6 +910,43 @@ class CommentForm(I18nModelForm):
         }
 
 
+class CountriesAndEU(Countries):
+    override = {
+        'ZZ': _('Any country'),
+        'EU': _('European Union')
+    }
+    first = ['ZZ', 'EU']
+
+
+class TaxRuleLineForm(forms.Form):
+    country = LazyTypedChoiceField(
+        choices=CountriesAndEU(),
+        required=False
+    )
+    address_type = forms.ChoiceField(
+        choices=[
+            ('', _('Any customer')),
+            ('individual', _('Individual')),
+            ('business', _('Business')),
+            ('business_vat_id', _('Business with valid VAT ID')),
+        ],
+        required=False
+    )
+    action = forms.ChoiceField(
+        choices=[
+            ('vat', _('Charge VAT')),
+            ('reverse', _('Reverse charge')),
+            ('no', _('No VAT')),
+        ],
+    )
+
+
+TaxRuleLineFormSet = formset_factory(
+    TaxRuleLineForm,
+    can_order=False, can_delete=True, extra=0
+)
+
+
 class TaxRuleForm(I18nModelForm):
     class Meta:
         model = TaxRule
diff --git a/src/pretix/control/templates/pretixcontrol/event/tax_edit.html b/src/pretix/control/templates/pretixcontrol/event/tax_edit.html
index 4b8639a173..b6379b4c05 100644
--- a/src/pretix/control/templates/pretixcontrol/event/tax_edit.html
+++ b/src/pretix/control/templates/pretixcontrol/event/tax_edit.html
@@ -1,5 +1,6 @@
 {% extends "pretixcontrol/event/settings_base.html" %}
 {% load i18n %}
+{% load formset_tags %}
 {% load bootstrap3 %}
 {% block title %}
     {% if rule %}
@@ -21,7 +22,7 @@
         {% bootstrap_field form.rate addon_after="%" layout="control" %}
         <legend>{% trans "Advanced settings" %}</legend>
         <div class="alert alert-warning">
-            <span class="fa fa-w fa-legal fa-4x pull-left"></span>
+            <span class="fa fa-fw fa-legal fa-4x pull-left"></span>
             {% blocktrans trimmed with docs="https://docs.pretix.eu/en/latest/user/events/taxes.html" %}
                 These settings are intended for advanced users. See the <a href="{{ docs }}">documentation</a>
                 for more information. Note that we are not responsible for the correct handling
@@ -32,6 +33,75 @@
         {% bootstrap_field form.price_includes_tax layout="control" %}
         {% bootstrap_field form.eu_reverse_charge layout="control" %}
         {% bootstrap_field form.home_country layout="control" %}
+        <legend>{% trans "Custom taxation rules" %}</legend>
+        <div class="alert alert-warning">
+            <span class="fa fa-fw fa-exclamation-circle fa-4x pull-left"></span>
+            {% blocktrans trimmed %}
+                These settings are intended for professional users with very specific taxation situations.
+                If you create any rule here, the reverse charge settings above will be ignored. The rules will be
+                checked in order and once the first rule matches the order, it will be used and all further rules will
+                be ignored. If no rule matches, tax will be charged.
+            {% endblocktrans %}
+            <div class="clearfix"></div>
+        </div>
+
+        <div class="formset" data-formset data-formset-prefix="{{ formset.prefix }}">
+            {{ formset.management_form }}
+            {% bootstrap_formset_errors formset %}
+            <div data-formset-body>
+                {% for form in formset %}
+                    {% bootstrap_form_errors form %}
+                    <div class="row" data-formset-form>
+                        <div class="sr-only">
+                            {{ form.id }}
+                            {% bootstrap_field form.DELETE form_group_class="" layout="inline" %}
+                        </div>
+                        <div class="col-sm-4">
+                            {% bootstrap_field form.country layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-3">
+                            {% bootstrap_field form.address_type layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-3">
+                            {% bootstrap_field form.action layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-2 text-right">
+                            <button type="button" class="btn btn-danger" data-formset-delete-button>
+                                <i class="fa fa-trash"></i></button>
+                        </div>
+                    </div>
+                {% endfor %}
+            </div>
+            <script type="form-template" data-formset-empty-form>
+                {% escapescript %}
+                    <div class="row" data-formset-form>
+                        <div class="sr-only">
+                            {{ form.id }}
+                            {% bootstrap_field formset.empty_form.DELETE form_group_class="" layout="inline" %}
+                        </div>
+                        <div class="col-sm-4">
+                            {% bootstrap_field formset.empty_form.country layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-3">
+                            {% bootstrap_field formset.empty_form.address_type layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-3">
+                            {% bootstrap_field formset.empty_form.action layout='inline' form_group_class="" %}
+                        </div>
+                        <div class="col-sm-2 text-right">
+                            <button type="button" class="btn btn-danger" data-formset-delete-button>
+                                <i class="fa fa-trash"></i></button>
+                        </div>
+                    </div>
+                {% endescapescript %}
+            </script>
+            <p>
+                <button type="button" class="btn btn-default" data-formset-add>
+                    <i class="fa fa-plus"></i> {% trans "Add a new rule" %}</button>
+            </p>
+        </div>
+
+
         <div class="form-group submit-group">
             <button type="submit" class="btn btn-primary btn-save">
                 {% trans "Save" %}
diff --git a/src/pretix/control/views/event.py b/src/pretix/control/views/event.py
index 23c073818c..c6f16713ca 100644
--- a/src/pretix/control/views/event.py
+++ b/src/pretix/control/views/event.py
@@ -1,3 +1,4 @@
+import json
 import re
 from collections import OrderedDict
 from datetime import timedelta
@@ -40,8 +41,8 @@ from pretix.base.templatetags.money import money_filter
 from pretix.control.forms.event import (
     CommentForm, DisplaySettingsForm, EventDeleteForm, EventMetaValueForm,
     EventSettingsForm, EventUpdateForm, InvoiceSettingsForm, MailSettingsForm,
-    PaymentSettingsForm, ProviderForm, TaxRuleForm, TicketSettingsForm,
-    WidgetCodeForm,
+    PaymentSettingsForm, ProviderForm, TaxRuleForm, TaxRuleLineFormSet,
+    TicketSettingsForm, WidgetCodeForm,
 )
 from pretix.control.permissions import EventPermissionRequiredMixin
 from pretix.control.signals import nav_event_settings
@@ -952,9 +953,30 @@ class TaxCreate(EventSettingsViewMixin, EventPermissionRequiredMixin, CreateView
             'name': LazyI18nString.from_gettext(ugettext('VAT'))
         }
 
+    def post(self, request, *args, **kwargs):
+        form = self.get_form()
+        if form.is_valid() and self.formset.is_valid():
+            return self.form_valid(form)
+        else:
+            return self.form_invalid(form)
+
+    @cached_property
+    def formset(self):
+        return TaxRuleLineFormSet(
+            data=self.request.POST if self.request.method == "POST" else None,
+        )
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+        ctx['formset'] = self.formset
+        return ctx
+
     @transaction.atomic
     def form_valid(self, form):
         form.instance.event = self.request.event
+        form.instance.custom_rules = json.dumps([
+            f.cleaned_data for f in self.formset if f not in self.formset.deleted_forms
+        ])
         messages.success(self.request, _('The new tax rule has been created.'))
         ret = super().form_valid(form)
         form.instance.log_action('pretix.event.taxrule.added', user=self.request.user, data=dict(form.cleaned_data))
@@ -980,9 +1002,32 @@ class TaxUpdate(EventSettingsViewMixin, EventPermissionRequiredMixin, UpdateView
         except TaxRule.DoesNotExist:
             raise Http404(_("The requested tax rule does not exist."))
 
+    def post(self, request, *args, **kwargs):
+        self.object = self.get_object(self.get_queryset())
+        form = self.get_form()
+        if form.is_valid() and self.formset.is_valid():
+            return self.form_valid(form)
+        else:
+            return self.form_invalid(form)
+
+    @cached_property
+    def formset(self):
+        return TaxRuleLineFormSet(
+            data=self.request.POST if self.request.method == "POST" else None,
+            initial=json.loads(self.object.custom_rules) if self.object.custom_rules else []
+        )
+
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+        ctx['formset'] = self.formset
+        return ctx
+
     @transaction.atomic
     def form_valid(self, form):
         messages.success(self.request, _('Your changes have been saved.'))
+        form.instance.custom_rules = json.dumps([
+            f.cleaned_data for f in self.formset if f not in self.formset.deleted_forms
+        ])
         if form.has_changed():
             self.object.log_action(
                 'pretix.event.taxrule.changed', user=self.request.user, data={
diff --git a/src/tests/base/test_taxrules.py b/src/tests/base/test_taxrules.py
new file mode 100644
index 0000000000..d597121f54
--- /dev/null
+++ b/src/tests/base/test_taxrules.py
@@ -0,0 +1,387 @@
+import json
+from decimal import Decimal
+
+import pytest
+from django.utils.timezone import now
+from django_countries.fields import Country
+
+from pretix.base.models import Event, InvoiceAddress, Organizer, TaxRule
+
+
+@pytest.fixture
+def event():
+    o = Organizer.objects.create(name='Dummy', slug='dummy')
+    event = Event.objects.create(
+        organizer=o, name='Dummy', slug='dummy',
+        date_from=now()
+    )
+    return event
+
+
+@pytest.mark.django_db
+def test_from_gross_price(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=True
+    )
+    tp = tr.tax(Decimal('100.00'))
+    assert tp.gross == Decimal('100')
+    assert tp.net == Decimal('90.91')
+    assert tp.tax == Decimal('100.00') - Decimal('90.91')
+    assert tp.rate == Decimal('10.00')
+
+
+@pytest.mark.django_db
+def test_from_net_price(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    tp = tr.tax(Decimal('100.00'))
+    assert tp.gross == Decimal('110.00')
+    assert tp.net == Decimal('100.00')
+    assert tp.tax == Decimal('10.00')
+    assert tp.rate == Decimal('10.00')
+
+
+@pytest.mark.django_db
+def test_reverse_charge_no_address(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True,
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    assert not tr.is_reverse_charge(None)
+    assert tr.tax_applicable(None)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_no_country(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True,
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_individual_same_country(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=False,
+        country=Country('DE')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_individual_eu(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=False,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_individual_3rdc(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=False,
+        country=Country('US')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_business_same_country(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('DE')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_business_eu(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_business_3rdc(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('US')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_valid_vat_id_business_same_country(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('DE'),
+        vat_id='DE123456',
+        vat_id_validated=True
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_valid_vat_id_business_eu(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        vat_id='AT12346',
+        vat_id_validated=True,
+        country=Country('AT')
+    )
+    assert tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_valid_vat_id_business_3rdc(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('US'),
+        vat_id='US12346',
+        vat_id_validated=True
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_reverse_charge_disabled(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=False, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        vat_id='AT12346',
+        vat_id_validated=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_override(event):
+    tr = TaxRule(
+        event=event, eu_reverse_charge=True, home_country=Country('DE'),
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'ZZ', 'address_type': '', 'action': 'vat'}
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        vat_id='AT12346',
+        vat_id_validated=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_in_order(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'ZZ', 'address_type': '', 'action': 'vat'},
+            {'country': 'ZZ', 'address_type': '', 'action': 'reverse'}
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        vat_id='AT12346',
+        vat_id_validated=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_any_country(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'ZZ', 'address_type': '', 'action': 'no'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_eu_country(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'EU', 'address_type': '', 'action': 'no'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('US')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_specific_country(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'AT', 'address_type': '', 'action': 'no'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('DE')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_individual(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'ZZ', 'address_type': 'individual', 'action': 'no'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=False,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('DE')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_business(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'ZZ', 'address_type': 'business', 'action': 'no'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
+    ia = InvoiceAddress(
+        is_business=False,
+        country=Country('DE')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+
+
+@pytest.mark.django_db
+def test_custom_rules_vat_id(event):
+    tr = TaxRule(
+        event=event,
+        rate=Decimal('10.00'), price_includes_tax=False,
+        custom_rules=json.dumps([
+            {'country': 'EU', 'address_type': 'business_vat_id', 'action': 'reverse'},
+        ])
+    )
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('AT')
+    )
+    assert not tr.is_reverse_charge(ia)
+    assert tr.tax_applicable(ia)
+    ia = InvoiceAddress(
+        is_business=True,
+        country=Country('DE'),
+        vat_id='DE1234',
+        vat_id_validated=True
+    )
+    assert tr.is_reverse_charge(ia)
+    assert not tr.tax_applicable(ia)
diff --git a/src/tests/presale/test_checkout.py b/src/tests/presale/test_checkout.py
index b02862c2c6..719d991d74 100644
--- a/src/tests/presale/test_checkout.py
+++ b/src/tests/presale/test_checkout.py
@@ -1,4 +1,5 @@
 import datetime
+import json
 import os
 from datetime import timedelta
 from decimal import Decimal
@@ -415,6 +416,51 @@ class CheckoutTestCase(TestCase):
         ia = InvoiceAddress.objects.get(pk=self.client.session['carts'][self.session_key].get('invoice_address'))
         assert not ia.vat_id_validated
 
+    def test_custom_tax_rules(self):
+        self.tr19.custom_rules = json.dumps([
+            {'country': 'AT', 'address_type': '', 'action': 'vat'},
+            {'country': 'ZZ', 'address_type': '', 'action': 'reverse'},
+        ])
+        self.tr19.save()
+        self.event.settings.invoice_address_vatid = True
+
+        cr1 = CartPosition.objects.create(
+            event=self.event, cart_id=self.session_key, item=self.ticket,
+            price=23, expires=now() + timedelta(minutes=10)
+        )
+
+        with mock.patch('vat_moss.id.validate') as mock_validate:
+            mock_validate.return_value = ('AT', 'AT123456', 'Foo')
+            self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
+                'is_business': 'business',
+                'company': 'Foo',
+                'name': 'Bar',
+                'street': 'Baz',
+                'zipcode': '12345',
+                'city': 'Here',
+                'country': 'AT',
+                'vat_id': 'AT123456',
+                'email': 'admin@localhost'
+            }, follow=True)
+
+        cr1.refresh_from_db()
+        assert cr1.price == Decimal('23.00')
+
+        self.client.post('/%s/%s/checkout/questions/' % (self.orga.slug, self.event.slug), {
+            'is_business': 'business',
+            'company': 'Foo',
+            'name': 'Bar',
+            'street': 'Baz',
+            'zipcode': '12345',
+            'city': 'Here',
+            'country': 'DE',
+            'vat_id': 'DE123456',
+            'email': 'admin@localhost'
+        }, follow=True)
+
+        cr1.refresh_from_db()
+        assert cr1.price == Decimal('19.33')
+
     def test_question_file_upload(self):
         q1 = Question.objects.create(
             event=self.event, question='Student ID', type=Question.TYPE_FILE,