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Late payment interest calculator

Work out how much interest an overdue invoice has accrued, per day and in total, and the amount to claim in your reminder or formal notice.

EUR

The rate in your terms of sale or the legal rate of your country.

%

Optional. Between businesses in the EU: at least €40 per invoice.

EUR

Result

Fill in the fields to see the result.

Your last inputs are kept in this browser.

Results are provided for information. Check tax rates and legal requirements that apply to you.

How to use it

  1. Enter the amount of the unpaid invoice.
  2. Enter the annual rate from your terms of sale (or the legal rate) and the number of days since the due date.
  3. Add the fixed recovery fee if it applies, then copy the total into your reminder.

Examples

€5,000, 10 % a year, 45 days late

5,000 × 10 % × 45 / 365 = €61.64 of interest; with the €40 fee, €5,101.64 to claim.

$12,000, 8 % a year, 90 days late

12,000 × 8 % × 90 / 365 = $236.71 of interest.

Frequently asked questions

How is the interest calculated?

Simple interest: amount × annual rate × days late ÷ 365. Interest runs from the day after the due date until payment.

Which rate should I use?

The rate written in your terms of sale or on the invoice. Without one, many countries apply a legal rate between businesses (in the EU, at least the central bank rate plus 8 points).

What is the fixed recovery fee?

In the EU, a business paid late can claim at least €40 per invoice for recovery costs, on top of the interest. Other countries have their own rules.

Is this legal advice?

No. It is an estimate to prepare your reminder: check the rules and rates that apply in your country and contract.

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