Estimate statutory interest and fixed recovery compensation on an overdue UK B2B invoice under the Late Payment of Commercial Debts (Interest) Act 1998. Runs entirely in your browser — nothing is uploaded.
Not legal advice. Qualifying commercial (business-to-business) debts only. A different substantial contractual remedy can change entitlement. Cross-check with GOV.UK and the Office of the Small Business Commissioner calculator. Verify the Bank of England reference rate for your overdue period.
Interest starts the day after the due date.
Use today if still unpaid, or the date paid.
Default 3.75% (BoE rate on 30 Jun 2026 / 31 Dec 2025 — check for your period).
Days overdue = calendar days from the day after due date through the “as of” date (inclusive of both ends in the usual day-count used here).
Fixed compensation (recovery cost): £40 if debt < £1,000; £70 if £1,000–£9,999.99; £100 if £10,000+.
Reference rate is the BoE base rate in force on 31 Dec (for interest starting 1 Jan–30 Jun) or 30 Jun (for interest starting 1 Jul–31 Dec). It is fixed when interest starts for that debt.
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