Invoicing & Payments · updated 2026-08-08

How to apply a discount to an invoice in Dumpster Controls

You can lower the amount a customer pays on any unpaid invoice with a fixed or percentage discount. The change is logged and the payment link updates to the new total automatically.

Before you start

• An unpaid invoice.

1. Open the discount dialog

   In "Order History", open the order's invoice section and click "Apply discount" (or "Edit / Remove discount" if one already exists).

2. Choose the "Discount type"

   Pick "Fixed amount" or "Percentage" and enter the value. A live preview shows "Current invoice total", "Discount", and "New total customer pays".

3. Give a reason

   The "Reason (required)" field is mandatory and is saved to the order timeline and audit log.

4. Apply

   Confirm to apply. A success message shows the new total. The dialog also lets you remove an existing discount.

What happens next

• The payment link is refreshed so the customer pays the discounted total.
• The discount appears as a line on the invoice with its reason.

Troubleshooting

It says the discount cannot exceed the invoice total.

The discount would take the total below zero. Enter a smaller value.

Related guides

• How to send a payment link in Dumpster Controls
• How to charge an extra fee in Dumpster Controls

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