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Tax guides and tools.

Plain-English guides to UK tax and filing deadlines, plus a penalty estimator.

Guides

10 articles

Free tool

Penalty Estimator

Calculate penalties for late accounts, Corporation Tax, VAT, and Self Assessment

  • Companies House late accounts, private and public, with the doubling rule
  • Corporation Tax return penalties at the April 2026 rates, plus late payment interest
  • VAT penalty points and late payment penalties at the April 2025 rates
  • Self Assessment late filing and payment penalties
  • Itemised breakdown with interest at HMRC’s rate on each day

Penalty estimator

Pick what was late, enter the dates and see an itemised estimate.

Companies House
Corporation Tax
VAT
Self Assessment
FileCompanies House

Companies House: late accounts

Your estimate appears here

Each penalty and any interest is listed separately, with how it’s worked out.

Official guidance

This is an estimate, not a bill. HMRC and Companies House decide the actual amount, and appeals, reasonable excuses, time to pay arrangements and part payments can change it. Interest uses HMRC’s late payment rate, currently 7.75% a year from 9 January 2026 (Bank Rate plus 4%), with earlier rates applied to earlier days. Rates last checked 10 October 2026. If you use Making Tax Digital for Income Tax, different Self Assessment penalties apply.

Want the Companies House penalty bands and what to do if you have missed the deadline? Open the late filing penalty calculator page.

Quick explainers

Five short guides you can open without leaving the page.

Need to work out your deadlines?

Use the deadline generator to see the dates that apply to your business over the next 12 months.

Generate my deadlines