HMRC Penalty Calculator
Free, instant, no signup. Know your exposure before HMRC does.
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MTD Penalty Points
Calculate your Making Tax Digital penalty points and financial penalties under the points-based system.
Late Payment Penalty
Calculate penalties and interest for late payment of income tax under the new 2026/27 penalty regime.
Self Assessment Penalty
Calculate penalties for late Self Assessment returns under the current filing and payment rules.
Points Reset Calculator
Find out when your penalty points expire or how long it takes to reset them after reaching the threshold.
Guides
Common questions
How much is the HMRC penalty for a late tax return?▾
The Self Assessment late filing penalty starts at £100 on day 1, even if no tax is owed. After 3 months, £10 daily penalties apply (up to £900). A further 5% of tax owed or £300 is added at 6 months, and again at 12 months. Use our Self Assessment penalty calculator for an exact figure.
What is the HMRC late payment interest rate?▾
HMRC charges interest at 8.75% per annum (Bank of England base rate + 4%) on unpaid tax as of 6 May 2025. Interest runs from the day after the payment deadline until the balance is cleared. Our late payment interest calculator shows the daily accrual.
What are MTD ITSA penalty points?▾
Making Tax Digital (MTD) for Income Tax uses a points-based system. You receive 1 point for each missed quarterly update or final declaration. Reaching 4 points triggers a £200 financial penalty for every further miss. Points below the threshold expire automatically after 24 months.
Can I appeal an HMRC penalty?▾
Yes — if you have a genuine reasonable excuse (serious illness, bereavement, or an HMRC system failure) you can appeal within 30 days of the penalty notice. A tax specialist can assess your grounds and manage the appeal on your behalf.