Late Payment Interest Calculator
Work out how much interest to charge on an invoice that was paid late, based on days overdue and an annual interest rate.
This tool is provided for convenience and does not constitute tax, legal, or financial advice. Check figures and documents with a qualified professional before relying on them.
Leave as today if still unpaid.
Defaults to 8%, a commonly referenced statutory late-payment rate in some jurisdictions -- check what applies to you.
Interest owed
$0.00
Days late0
Original amount$2,500.00
Total now owed$2,500.00
FAQ
- What interest rate should I charge on a late invoice?
- This varies by jurisdiction and contract terms. Some places set a statutory late-payment rate for commercial invoices (this calculator defaults to 8% as a commonly referenced figure), but you should check what applies in your location, or what you agreed with the client in your contract or payment terms.
- How is the interest calculated?
- Simple daily interest: the invoice amount multiplied by the annual rate, multiplied by the number of days late divided by 365. It does not compound.
- Is my data sent anywhere?
- No. The calculation runs entirely in your browser -- nothing is sent to a server.
Related tools
Generate the original invoice with the Invoice Generator. See all tools.