Business Tools

Invoice Late Fee Calculator

Enter an invoice amount, monthly late fee rate, and days overdue to calculate the late fee owed.

$37.50
late fee owed
$5037.50
total amount now due

This only applies if your invoice or contract actually specifies a late fee rate — you generally can't charge one that wasn't agreed to upfront. Some jurisdictions also cap maximum allowable late fee/interest rates.

How to use this tool

  1. 1Enter the invoice amount.
  2. 2Enter your late fee rate (% per month).
  3. 3Enter days overdue.
  4. 4See the late fee and new total due.

Frequently asked questions

Can I charge a late fee that wasn't agreed to upfront?+

Generally no — late fees need to be specified in your invoice terms or contract before the fact, and some jurisdictions cap maximum allowable rates.

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