Self Assessment Penalty Appeal — Finance Act 2009 Schedule 55
HMRC issues thousands of self assessment penalties every year — many to people with genuine reasons for late filing or payment. Finance Act 2009 Schedule 55 provides a clear statutory framework for challenging these penalties, including a reasonable excuse defence and a right of independent tribunal appeal.
How HMRC Self Assessment Penalties Work
Under Finance Act 2009 Schedule 55, late filing penalties apply automatically: £100 for filing up to 3 months late; £10 per day (up to 90 days) for 3–6 months late; a further £300 or 5% of tax (whichever is higher) at 6 months; and another £300 or 5% at 12 months. Late payment penalties are separate and run in addition to late filing penalties. If you have a genuine reason these apply, challenge them — HMRC will often cancel automatic penalties where a reasonable excuse is clearly established.
Reasonable Excuse — What Works
The Finance Act 2009 does not define "reasonable excuse" — it has been developed through case law. The test is objective: would a reasonable taxpayer, exercising appropriate care and diligence, have failed to file on time for this reason? Courts have accepted: serious and unexpected illness requiring hospitalisation; bereavement of a spouse or close dependent; HMRC website failures on the deadline date (well documented, with screen evidence); destruction of records by fire or flood; and serious mental health crises.
Critically, the excuse must have applied throughout the period of default — not just at the deadline. And once the excuse ended, you must have filed as soon as reasonably practicable. A penalty appeal that cannot show prompt filing after the excuse cleared is harder to sustain.
The Three-Stage Appeal Process
Stage 1: Appeal directly to HMRC within 30 days of the penalty notice. Stage 2: If rejected, request a statutory review by a different HMRC officer (optional but recommended — many penalties are cancelled at this stage). Stage 3: Appeal to the First-tier Tax Tribunal (Tax Chamber), which is entirely independent of HMRC. The tribunal has no fee for straightforward penalty appeals and is accessible without legal representation.
Special Circumstances — HMRC Discretion
Under Sch 55 para 16, HMRC can reduce or cancel a penalty in "special circumstances" — even without a reasonable excuse. This catches exceptional cases outside the standard reasonable excuse test. HMRC applies it sparingly, but it is worth raising where your circumstances are genuinely unusual.
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Check My HMRC Penalty →Frequently Asked Questions
What is a "reasonable excuse" for a self assessment penalty?
Under Finance Act 2009 Schedule 55, a reasonable excuse can include: serious illness of yourself or a close dependant; bereavement of a close family member shortly before the deadline; unexpected hospital admission; a flood, fire, or other natural disaster affecting your records; or HMRC system failures on the filing deadline. Personal or business cash flow problems are specifically excluded by statute as a reasonable excuse for late payment penalties.
How do I appeal an HMRC self assessment penalty?
You have 30 days from the date of the penalty notice to appeal to HMRC directly. Submit your appeal in writing or via your online HMRC account, clearly stating the grounds. If HMRC rejects your appeal, you can request a statutory review by a different HMRC officer, and then appeal to the First-tier Tax Tribunal (Tax Chamber) — which is independent of HMRC.
What are "special circumstances" for penalty reduction?
Even if you do not have a reasonable excuse, HMRC has discretion to reduce a penalty where "special circumstances" exist under Finance Act 2009 Sch 55 para 16. This is a separate test from reasonable excuse. Special circumstances must be truly exceptional — unusual personal hardship, exceptional complexity, or circumstances outside the normal run of taxpayer situations. HMRC applies this narrowly, but the First-tier Tax Tribunal has sometimes been more generous.