Late Payment Penalty Calculator
Calculate your late payment penalties and interest under the new MTD ITSA penalty regime. Covers the 2026/27 first-year rules and 2027/28 onwards.
Guidance only. TaxPenalty.co.uk is a free tool based on HMRC’s published penalty rules. It does not constitute professional tax advice. Penalty rules and interest rates change — always verify your position at gov.uk or with a qualified accountant. Bank of England base rate used: 4.75%. Late payment interest rate: 8.75% (BoE + 4%) for MTD ITSA. Last verified: 6 May 2025.
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