Generate monthly retainer invoices factoring in base retainer fees plus extra hours billed at overage rates.
Calculate your monthly retainer invoice total and verify billable hours against the retainer agreement.
A retainer invoice calculator helps you calculate the monthly invoice amount for a retainer client. It verifies that the hours worked match the agreed retainer, calculates any overage charges, and shows the final invoice total.
Use it every month before sending the retainer invoice to make sure everything is correct.
If a retainer agreement allows 20 hours per month and the client needed 25 hours, the extra 5 hours are usually billed at the standard hourly rate or at an agreed overage rate.
This calculator handles base retainer amount plus any overage hours at the correct rate.
Retainer agreements define what happens to unused hours. Some carry over to the next month. Most do not, which means the client pays the full retainer even if they use fewer hours.
Define the unused hours policy clearly in your retainer agreement to avoid disputes.
Send the retainer invoice at the beginning of each month or on a fixed date. Include the retainer period, hours covered, base amount, any overage, and total.
The Tez Invoice free invoice generator helps you create a professional monthly retainer invoice.
A regular invoice bills for specific work completed. A retainer invoice bills for availability and a committed number of hours per month, often at the start of the period rather than after the work is done.
The structure differs, but both need to be professional, clear, and timely.
Tez Invoice is our free online invoice generator. No sign up. No watermark. Download clean PDF or JPEG invoices in seconds, right from your browser.
Common questions about Retainer Invoice Calculator: Calculate and Verify Monthly Retainer Amounts on Tez Invoice.
A monthly invoice for a retainer agreement covering a set number of committed hours or deliverables.
Multiply excess hours by the overage rate and add to the base retainer amount.
Yes. Free with no sign up.
Depends on the agreement. Most retainers do not carry over unused hours.
At the start of the month or billing period, not at the end.
Yes. Completely free with no sign up and no usage limits.
Yes. Fully responsive on all devices.
No. All processing is in your browser. Nothing is sent to any server.
Yes. Designed for freelancers and businesses.
Use the free Invoice Generator on Tez Invoice.