Late Payment Interest Calculator — free online
A client pays late, and now you're not sure how much to actually ask for. Just the original amount? Some interest on top? A late fee? Doing that math by hand is fiddly and easy to get wrong. We added a free tool that does it for you — Late Payment Interest — right in your browser.
What it does
You enter the invoice amount and how late the payment is, and it shows you the interest that has built up, any late fee, and the new total due. Everything is laid out clearly, so you know exactly what to put on the reminder you send.
Nothing leaves your device
The whole thing runs inside your browser. The amounts you type stay on your computer — nothing is uploaded to a server and nothing is saved anywhere. When you close the tab, it's gone.
How to use it
- Open Late Payment Interest.
- Type in the invoice amount and how overdue it is, plus the interest rate or late fee you charge.
- Read off the interest, fee and total due, and copy it into your reminder.
It's free with no limit. There are more small tools on the Apps page.