Fixed #23 -- Tax handling for payment fees

src/pretix/control/forms/event.py

@@ -108,6 +108,11 @@ class EventSettingsForm(SettingsForm):
                     "answers to questions."),
         required=False
     )
+    tax_rate_default = forms.DecimalField(
+        label=_('Tax rate for payment fees'),
+        help_text=_("The tax rate that applies for additional fees you configured for single payment methods "
+                    "(in percent)."),
+    )
     timezone = forms.ChoiceField(
         choices=((a, a) for a in common_timezones),
         label=_("Default timezone"),

src/pretix/control/templates/pretixcontrol/event/settings.html

@@ -36,14 +36,18 @@
             {% bootstrap_field sform.last_order_modification_date layout="horizontal" %}
         </fieldset>
         <fieldset>
-            <legend>{% trans "Order process settings" %}</legend>
+            <legend>{% trans "Orders" %}</legend>
             {% bootstrap_field sform.reservation_time layout="horizontal" %}
             {% bootstrap_field sform.max_items_per_order layout="horizontal" %}
             {% bootstrap_field sform.attendee_names_asked layout="horizontal" %}
             {% bootstrap_field sform.attendee_names_required layout="horizontal" %}
+        </fieldset>
+        <fieldset>
+            <legend>{% trans "Invoicing" %}</legend>
             {% bootstrap_field sform.invoice_address_asked layout="horizontal" %}
             {% bootstrap_field sform.invoice_address_required layout="horizontal" %}
             {% bootstrap_field sform.invoice_address_vatid layout="horizontal" %}
+            {% bootstrap_field sform.tax_rate_default layout="horizontal" %}
         </fieldset>
         <div class="form-group submit-group">
             <button type="submit" class="btn btn-primary btn-save">

src/pretix/control/templates/pretixcontrol/order/index.html

@@ -134,13 +134,18 @@
                 </div>
             {% endfor %}
             {% if items.payment_fee %}
-                {# TODO: Tax rate? #}
                 <div class="row-fluid product-row">
                     <div class="col-md-4 col-xs-6">
                         <strong>{% trans "Payment method fee" %}</strong>
                     </div>
                     <div class="col-md-3 col-xs-6 col-md-offset-5 price">
                         <strong>{{ event.currency }} {{ items.payment_fee|floatformat:2 }}</strong>
+                        {% if order.payment_fee_tax_rate %}
+                            <br/>
+                            <small>{% blocktrans trimmed with rate=order.payment_fee_tax_rate %}
+                                incl. {{ rate }}% taxes
+                            {% endblocktrans %}</small>
+                        {% endif %}
                     </div>
                     <div class="clearfix"></div>
                 </div>