Late Fee Calculator

Free late fee calculator. Estimate the charge on an overdue invoice from the monthly rate and days late.

How the late fee calculator works

Enter the invoice amount, your monthly late-fee rate and how many days overdue it is.

Late fee = amount × monthly rate × (days overdue ÷ 30).

Example: a 1,000 invoice at 1.5% per month, 45 days late → fee = 1,000 × 1.5% × 1.5 = 22.50.

Late fees must be stated in your agreement or terms and may be capped by local law. Check the rules for your country or state.

For information only – not financial, tax or legal advice. See our disclaimer.