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HMRC Penalty Appeal Letter Template
How to appeal against HMRC penalty citing reasonable excuse — what to include, your legal rights, and a free letter generator.
← All Letter Templates · HMRC & Tax · Last updated 18 August 2026
This is free rights guidance, not legal advice. For advice specific to your situation, see our About page or contact Citizens Advice.
If you need to appeal against HMRC penalty citing reasonable excuse, a written letter is the recommended first step — it creates a clear record and shows you're pursuing the matter formally. Below is what a strong hmrc penalty appeal letter should include, plus a free tool to generate yours.
What this letter needs to cover
- State the penalty reference, date and amount
- Set out the reasonable excuse clearly (illness, bereavement, postal failure, HMRC system error — specify from situation)
- Reference HMRC's reasonable excuse guidance
- Request the penalty is cancelled
- Note right to tribunal appeal if the appeal is rejected
See our full letter template library for related templates, or use our free checkers for guidance specific to your situation.
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