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Late Payment Fee & Interest Calculator

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Approximate only

Statutory late-payment interest rates change over time and vary by jurisdiction and contract terms. The presets below are illustrative approximations, not current legal rates. Always verify the applicable statutory rate for your country and invoice date before charging interest.

Result
Days overdue
0 days
Total amount due
$ 5,000.00
How this is calculated
Invoice amount$ 5,000.00
Daily rate (12.00% ÷ 365)0.0329%
Days overdue0
Accrued interest$ 0.00
Total due$ 5,000.00

Interest = invoice amount × (annual rate ÷ 365) × days overdue. Simple daily interest, not compounded.

FAQ

Frequently asked questions

Is the late fee calculator really free?

Yes. It's completely free to use, with no limits and no signup required.

Are the EU and UK rate presets exact statutory rates?

No. They're approximations for convenience. The EU Late Payment Directive uses the ECB reference rate + 8 percentage points, and the UK Late Payment of Commercial Debts Act uses the Bank of England base rate + 8%. Both reference rates move over time, so always check the current published rate for your invoice date before charging interest.

How is the accrued interest calculated?

Simple daily interest: invoice amount × (annual rate ÷ 365) × days overdue. It is not compounded, and days overdue is today's date minus the due date.

Is my invoice data sent anywhere?

No. The calculation runs entirely in your browser. The amount, dates and rate you enter never leave your device.

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