diff --git a/src/pretix/api/serializers/event.py b/src/pretix/api/serializers/event.py
index a46066bb48..786f3ffc96 100644
--- a/src/pretix/api/serializers/event.py
+++ b/src/pretix/api/serializers/event.py
@@ -668,6 +668,7 @@ class EventSettingsSerializer(SettingsSerializer):
         'cancel_allow_user_paid_keep_percentage',
         'cancel_allow_user_paid_adjust_fees',
         'cancel_allow_user_paid_adjust_fees_explanation',
+        'cancel_allow_user_paid_adjust_fees_step',
         'cancel_allow_user_paid_refund_as_giftcard',
         'cancel_allow_user_paid_require_approval',
         'change_allow_user_variation',
diff --git a/src/pretix/base/settings.py b/src/pretix/base/settings.py
index 9588a387f0..525b424acf 100644
--- a/src/pretix/base/settings.py
+++ b/src/pretix/base/settings.py
@@ -1225,6 +1225,21 @@ DEFAULTS = {
                         "e.g. to explain choosing a lower refund will help your organization.")
         )
     },
+    'cancel_allow_user_paid_adjust_fees_step': {
+        'default': None,
+        'type': Decimal,
+        'form_class': forms.DecimalField,
+        'serializer_class': serializers.DecimalField,
+        'serializer_kwargs': dict(
+            max_digits=10, decimal_places=2
+        ),
+        'form_kwargs': dict(
+            max_digits=10, decimal_places=2,
+            label=_("Step size for reduction amount"),
+            help_text=_('By default, customers can choose an arbitrary amount for you to keep. If you set this to e.g. '
+                        '10, they will only be able to choose values in increments of 10.')
+        )
+    },
     'cancel_allow_user_paid_require_approval': {
         'default': 'False',
         'type': bool,
diff --git a/src/pretix/control/forms/event.py b/src/pretix/control/forms/event.py
index 540b401dea..799ccb1d86 100644
--- a/src/pretix/control/forms/event.py
+++ b/src/pretix/control/forms/event.py
@@ -572,6 +572,7 @@ class CancelSettingsForm(SettingsForm):
         'cancel_allow_user_paid_keep_percentage',
         'cancel_allow_user_paid_adjust_fees',
         'cancel_allow_user_paid_adjust_fees_explanation',
+        'cancel_allow_user_paid_adjust_fees_step',
         'cancel_allow_user_paid_refund_as_giftcard',
         'cancel_allow_user_paid_require_approval',
         'change_allow_user_variation',
diff --git a/src/pretix/control/templates/pretixcontrol/event/cancel.html b/src/pretix/control/templates/pretixcontrol/event/cancel.html
index 5ef9f4bc7d..e99b7275e3 100644
--- a/src/pretix/control/templates/pretixcontrol/event/cancel.html
+++ b/src/pretix/control/templates/pretixcontrol/event/cancel.html
@@ -23,6 +23,7 @@
                 {% bootstrap_field form.cancel_allow_user_paid_adjust_fees layout="control" %}
                 <div data-display-dependency="#id_cancel_allow_user_paid_adjust_fees">
                     {% bootstrap_field form.cancel_allow_user_paid_adjust_fees_explanation layout="control" %}
+                    {% bootstrap_field form.cancel_allow_user_paid_adjust_fees_step layout="control" %}
                 </div>
                 {% bootstrap_field form.cancel_allow_user_paid_refund_as_giftcard layout="control" %}
                 {% if not gets_notification %}
diff --git a/src/pretix/presale/templates/pretixpresale/event/order_cancel.html b/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
index 187cc39cc9..018d072c76 100644
--- a/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
+++ b/src/pretix/presale/templates/pretixpresale/event/order_cancel.html
@@ -62,13 +62,20 @@
                         value="{{ cancel_fee|stringformat:".2f" }}"
                         data-slider-min="{{ cancel_fee|stringformat:".2f" }}"
                         data-slider-value="{{ cancel_fee|stringformat:".2f" }}"
-                        data-slider-step="0.01"
-                        data-slider-max="{{ order.payment_refund_sum|stringformat:".2f" }}"
+                        {% if request.event.settings.cancel_allow_user_paid_adjust_fees_step %}
+                            data-slider-ticks="{{ ticks }}"
+                            data-slider-lock-to-ticks="true"
+                        {% else %}
+                            data-slider-step="0.01"
+                        {% endif %}
+                        data-slider-max="{{ payment_refund_sum|stringformat:".2f" }}"
                         data-slider-tooltip="hide"/>
                 <div id="cancel-fee-refund"></div>
             </div>
             <div class="text-center" id="cancel-fee-custom-link">
-                <a id="cancel-fee-custom"><small>{% trans "Enter custom amount" %}</small></a>
+                {% if not request.event.settings.cancel_allow_user_paid_adjust_fees_step %}
+                    <a id="cancel-fee-custom"><small>{% trans "Enter custom amount" %}</small></a>
+                {% endif %}
             </div>
         {% else %}
             <p>
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index 29d6ce2e4d..acd8aa291e 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -1,4 +1,5 @@
 import inspect
+import json
 import mimetypes
 import os
 import re
@@ -786,16 +787,27 @@ class OrderCancel(EventViewMixin, OrderDetailMixin, TemplateView):
     def get_context_data(self, **kwargs):
         ctx = super().get_context_data(**kwargs)
         ctx['order'] = self.order
+        prs = self.order.payment_refund_sum
         fee = self.order.user_cancel_fee
-        refund_amount = self.order.payment_refund_sum - fee
+        refund_amount = prs - fee
         proposals = self.order.propose_auto_refunds(refund_amount)
         ctx['cancel_fee'] = fee
         ctx['refund_amount'] = refund_amount
+        ctx['payment_refund_sum'] = prs
         ctx['can_auto_refund'] = sum(proposals.values()) == refund_amount
         ctx['proposals'] = [
             p.payment_provider.payment_presale_render(payment=p)
             for p in proposals
         ]
+        if self.request.event.settings.cancel_allow_user_paid_adjust_fees_step:
+            steps = [fee]
+            s = fee
+            while s < prs:
+                steps.append(s)
+                s += self.request.event.settings.cancel_allow_user_paid_adjust_fees_step
+            if prs not in steps:
+                steps.append(prs)
+            ctx['ticks'] = json.dumps([float(p) for p in steps])
         return ctx
 
 
@@ -831,6 +843,11 @@ class OrderCancelDo(EventViewMixin, OrderDetailMixin, AsyncAction, View):
                     messages.error(request, _('You chose an invalid cancellation fee.'))
                     return redirect(self.get_order_url())
             if custom_fee is not None and fee <= custom_fee <= self.order.payment_refund_sum:
+                if self.request.event.settings.cancel_allow_user_paid_adjust_fees_step:
+                    if (custom_fee - fee) % self.request.event.settings.cancel_allow_user_paid_adjust_fees_step != Decimal('0.00'):
+                        messages.error(request, _('You chose an invalid cancellation fee.'))
+                        return redirect(self.get_order_url())
+
                 fee = custom_fee
             else:
                 messages.error(request, _('You chose an invalid cancellation fee.'))
diff --git a/src/pretix/static/pretixpresale/scss/_event.scss b/src/pretix/static/pretixpresale/scss/_event.scss
index c234f716bb..5901d0784c 100644
--- a/src/pretix/static/pretixpresale/scss/_event.scss
+++ b/src/pretix/static/pretixpresale/scss/_event.scss
@@ -214,6 +214,11 @@ h2.subevent-head {
         @include slider_background-image($brand-success, darken($brand-success, 5%), mix($brand-success, darken($brand-success, 5%)));
     }
 
+    .slider-tick-container {
+        opacity: 0;
+        visibility: hidden;
+    }
+
     input {
         flex: 0;
     }