Late payment interest calculator

Enter an invoice amount, how many days it is overdue and the annual interest rate to see the interest charged, any fixed fee and the total now due. Nothing is uploaded.

Invoice amount

Days overdue

Annual interest rate (%)

Fixed compensation / fee

Currency symbol

—Interest charged

—Fixed fee

—Total due

EU statutory rule of thumb: interest is the ECB reference rate plus 8 percentage points, with a fixed €40 (or local-currency) recovery fee per invoice. Enter the rate that applies to you — this is an estimate, not legal or tax advice.

Everything runs in your browser. No upload, no sign-up.

How it works

STEP 1

Enter the invoice

Type the unpaid amount and how many days late it is.

STEP 2

Set the rate

The annual rate defaults to 8% — change it to your contract or statutory rate, and add any fixed fee.

STEP 3

See what is owed

Interest, the fixed fee and the total now due update instantly. All private.