How is late fee interest calculated on an invoice?

The standard daily simple interest formula is: Late Fee = Invoice Amount × (Annual Interest Rate / 365) × Days Overdue.

What is the standard interest rate for late invoices?

Standard commercial late payment interest rates range from 1% to 1.5% per month (12% to 18% per year), though this depends on the local country regulations and the agreement contract.

Invoice Late Fee Calculator

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Calculate interest penalties and daily finance charges on past-due invoices, and generate professional notice emails.

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Invoice Details

Invoice Amount

Annual Interest Rate (%)

Flat Late Fee Penalty

Invoice Due Date

Calculation / Payment Date

Interest Calculation Type

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