Late fee calculator

The compounding cost of missed payments.

Built and reviewed by Dovanic, Founder and editor, FreeByteLast reviewed: 2026-08-18

Late fee

Times per year

Penalty APR

29.9%

Balance

Yearly fee cost

$156

Extra interest from penalty rate

$500

With these inputs, yearly fee cost comes to $156. Extra interest from penalty rate works out to $500. The result assumes penalty apr stays at 29.9%.

What moves the number · Yearly fee cost

Input	−10%	Now	+10%
Late fee	$140	$156	$172
Times per year	$140	$156	$172

Whatmakesequal

Save this set of inputs, change something, then save again to compare the outcomes side by side.

The compounding cost of missed payments.

With the defaults above, yearly fee cost works out at $156.