GlenCalc

Late fee and invoice interest calculator

Late fees must be in your contract or terms, and many states cap the rate. Check your local rules.

Your answer

Late charges$99.86
Amount now due$4,599.86
Interest$99.86
Yearly rate18 %

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How we worked it out

Updated as you change the numbers.

  1. Interest = amount × yearly rate ÷ 365 × days late (simple interest).

Method and assumptions

1.5% a month (18% a year) is a common term; some states cap commercial or consumer late charges lower.

Questions

What is 1.5% a month on a $4,500 invoice 45 days late?

About $99.86.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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