Late Payment Fee Calculator
Enter the invoice, how many days it’s overdue and the late terms in your contract.
- ✓ Free
- ✓ No signup
- ✓ Private — runs in your browser
How late payment interest is calculated
Interest = invoice amount × annual rate × days overdue ÷ 365. Many contracts also add a fixed administration fee per overdue invoice.
Put late fees in your terms
Late fees are easiest to enforce when they're in your contract and printed on every invoice: the due date, the interest rate and any fixed fee. Shorter payment terms and deposits reduce the problem in the first place — see the payment terms calculator.
Frequently asked questions
What interest rate can I charge on late invoices?
It depends on your contract and the law where you and your client are. Some countries set a statutory rate for business-to-business invoices; others cap what you can charge. Check local rules or ask an accountant.
Should I charge late fees to a good client?
You can waive them as a goodwill gesture, but tell the client you're doing so. It reminds them the terms exist.
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