Late payment interest calculator

It depends on your country and what was agreed in the contract or invoice. In the EU, the late payment directive is usually based on the ECB reference rate plus a statutory margin, but each country sets its own details — check the one that applies to your case.

The outstanding amount is multiplied by the annual interest rate and by the proportion of late days out of 365, following the simple-interest method most commonly used for this kind of calculation.

No interest applies; the calculator lets you know the payment isn't late.

Yes, you can choose from the most common currencies right in the form.

No, the whole calculation happens in your browser, with no connection to any server.

No, it's for guidance only. To formally claim late-payment interest, check the regulations that apply in your country and, if in doubt, consult a professional.