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.

1. 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. 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. 3

   Give a reason

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

4. 4

   Apply

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