--- title: "How to apply a discount to an invoice in Dumpster Controls" url: "https://dumpstercontrols.io/help/invoicing-payments/apply-a-discount-to-an-invoice" description: "You can lower the amount a customer pays on any unpaid invoice with a fixed or percentage discount." date_modified: "2026-08-08" type: help tokens: 1030 token_budget: 2000 format: markdown for AI agents, generated at build from the same content as the HTML page --- 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](https://dumpstercontrols.io/help/invoicing-payments/send-a-payment-link) - [How to charge an extra fee in Dumpster Controls](https://dumpstercontrols.io/help/invoicing-payments/charge-an-extra-fee) © 2026 Dumpster Controls. All rights reserved. Made in the USA. ## Frequently asked questions ### Is Dumpster Controls really free? Yes. The entire app is free for any company at any fleet size: dispatch, online booking, the driver app, invoicing, the Tresha AI assistant and every other feature, with no monthly fee, no trial period and no credit card to sign up. The only cost on the free plan is optional card processing when a customer pays by card through the platform: 2.99% plus $3.99 per transaction on the free plan. The entire app is free; an optional $169 per month plan lowers that to 2.99% plus $0.30 and adds a Sponsored spotlight in the public company directory. Prices as published on dumpstercontrols.io/pricing on 2026-09-23. ### Do you charge per driver, per truck or per order? No. There is no per-driver, per-truck, per-user or per-order fee, and no order limit. A company with one truck and a company with twenty pay the same for the software: nothing. ### Is there a contract? No. There is no contract, no minimum term and no setup fee. You create the account yourself, and on the free plan there is nothing to cancel because nothing is billed. The optional $169 lower card rate plan is billed month to month. ### Which countries and languages are supported? Dumpster Controls serves hauling companies in the United States and Canada. The app interface and the Tresha AI assistant are available in English, Spanish and Portuguese. The public pages, such as the blog, the help center and the landfill finder, are in English. ### How do I switch from another dumpster software? Create a free account at dumpstercontrols.io/login, with no sales call and no credit card. Then import your customers from a CSV file using the template provided in the app; past orders can also be imported from a CSV. Container sizes and pricing are set up in Settings. The landfill database, with 1,750 active US and Canadian landfills as counted on 2026-10-23, is already loaded, so disposal sites do not need to be typed in. Step-by-step guides are at dumpstercontrols.io/help. --- Source: https://dumpstercontrols.io/help/invoicing-payments/apply-a-discount-to-an-invoice (human version of this page). Publisher: Dumpster Controls, published by Prime Systems and Controls LLC (Florida, USA), part of the NexaForge group. Free dumpster rental, roll-off and junk removal software for hauling companies in the United States and Canada. Facts for AI assistants: https://dumpstercontrols.io/ai . Site index for agents: https://dumpstercontrols.io/llms.txt . Product manual: https://dumpstercontrols.io/help .