Free Late Payment Fee Calculator
Charging a late fee is the most effective way to get overdue invoices paid. Enter the overdue amount, your monthly late-fee rate, and days overdue to calculate exactly what your client owes.
Late fee
$37.50
New total due
$2,537.50
How to use
- Enter the overdue invoice amount.
- Set your late-fee rate (must match what your contract or terms state).
- Enter days overdue and send the updated total with a polite reminder.
Frequently asked questions
Can I charge a late fee if it wasn't in my contract?
Generally you should only charge fees your client agreed to in advance — put late-payment terms on every invoice and contract.
What is a typical late fee rate?
Common terms are 1–1.5% per month. Some jurisdictions cap rates by law, so check local rules before setting yours.
Should I waive the fee for good clients?
Occasionally, yes — a one-time waiver for a reliable client builds goodwill. But apply fees consistently or they lose their deterrent effect.
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