Free small-business utility

Estimate the cost of an overdue UK business invoice.

Use the interest rate for the relevant period to calculate a clear, local estimate. No invoice details leave your browser.

1 · Add only the calculation inputs

Keep it simple and check the terms.

Invoice amount, including VAT

Days overdue

Bank of England base rate for this period

Check the official rate for the applicable half-year.

Check Bank Rate history ↗

Before you rely on the estimate This is a business-to-business invoice for goods or services. My contract does not set a different interest rate or alternative late-payment remedy. The invoice is due, overdue, and not disputed.

What this uses

One transparent formula, not a legal decision.

Interest. The estimate uses (invoice amount × annual rate ÷ 365) × days overdue. UK statutory interest on eligible late commercial payments is 8% plus the Bank of England base rate.

Compensation. The fixed estimate is £40 below £1,000, £70 from £1,000 to £9,999.99, and £100 at £10,000 or more.

One period only. If the debt crosses a Bank Rate period or has unusual terms, use the official calculator rather than applying one rate across the whole delay.

Important limits

Check the official guidance before acting.

This tool does not collect or store your inputs. It does not decide whether you are entitled to charge interest, whether a contract provides another remedy, or whether a debt is disputed. It is not legal, tax, or debt-recovery advice.

For the current rules, historic rates, and a fuller calculation, use the GOV.UK late-commercial-payment guidance and the Office of the Small Business Commissioner calculator.