HMRC Late Filing Penalty Appeal Letter

Editable letter template for appealing an HMRC Self Assessment late-filing penalty. Covers the 'reasonable excuse' grounds HMRC recognises (serious illness, bereavement, postal failure, fire / flood, software issues, HMRC errors). Available as DOCX (editable in Microsoft Word, Google Docs, LibreOffice) or PDF (for offline form-filling), plus copyable text on-page for direct paste into your own document. No signup, no email, direct download.

Last reviewed: 23 May 2026

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Download DOCX (editable)(~35KB)Download PDF (printable / offline)(~120KB)

What it contains

DOCX template with fillable bracketed fields for: your name + UTR + tax year + penalty reference + penalty amount + the specific reasonable excuse + supporting evidence list + signature block. PDF version of the same template (for offline use or where DOCX is not compatible). On-page copyable text for users who prefer to paste the letter content into their own document without downloading. The template covers the standard HMRC reasonable-excuse framework + provides language for the most common scenarios (serious illness, bereavement, postal failure, technical issues with HMRC systems, software issues, recent diagnosis of disability or condition affecting capacity to file). Adapt the specific paragraph to your actual situation, the template is a starting point, not a guaranteed-success script.

How to use it

Read the penalty notice carefully first

Before drafting your appeal, confirm: (1) the exact penalty amount + tax year referenced; (2) the date of the penalty notice (your 30-day appeal window starts from this date, not from when you received it); (3) which specific filing failure triggered the penalty (Self Assessment return late vs balancing payment late vs Class 4 NI late, different appeal grounds apply). The penalty notice + your records of attempted filing or payment are critical evidence.

Identify which reasonable excuse fits

HMRC's published list of accepted reasonable excuses includes: serious illness; bereavement of a close family member; postal failure (e.g. Royal Mail strikes affecting your post); fire, flood, or theft preventing access to records; software failure (your tax software or HMRC's website); HMRC errors or unclear guidance. NOT accepted: 'I forgot'; 'I did not have the money to pay'; 'my accountant did not file on time' (you remain ultimately responsible); 'the deadline was awkward'. Your reasonable excuse must be something genuinely outside your control + you must have taken reasonable steps to comply once the excuse no longer applied.

Fill in the template + gather supporting evidence

Open the DOCX in your preferred document editor. Replace [bracketed fields] with your specific details. Customise the 'Reason for late filing' paragraph to your actual situation, generic language is less persuasive than specifics. Gather supporting evidence: medical records or hospital admission letters (for illness); death certificates (for bereavement); screenshots of failed online filings (for software issues); printed proof of postage receipts (for postal failures). HMRC weighs the evidence heavily.

Submit + track

Submit the appeal by post (to the address on the penalty notice, usually 'HM Revenue and Customs, Self Assessment, BX9 1AS') OR online via your HMRC personal tax account (Account, Self Assessment, Appeals, easier + provides a digital receipt). Keep a copy of the appeal + any tracking number. HMRC typically responds within 8 to 12 weeks. If rejected at first appeal, you can request an HMRC internal review (additional 30-day window) + ultimately appeal to the First-tier Tribunal (further 30 days from review outcome). For complex or substantial penalties, specialist tax adviser engagement is worth the cost.

Copy the letter text

Prefer not to download? Copy the text below and paste into your own document.

[Your full name]
  [Your address]
  [Date]

  HM Revenue and Customs
  Self Assessment
  BX9 1AS

  Reference: [Penalty notice reference number]
  UTR: [Your Unique Taxpayer Reference]
  Tax year: [e.g. 2024/25]

  Dear Sir or Madam,

  Appeal against late-filing penalty

  I am writing to appeal the late-filing penalty issued on [date of penalty notice] in the amount of £[amount] for the [tax year] Self Assessment return.

  I submit that I have a reasonable excuse for the late filing under Schedule 55 Finance Act 2009, on the following grounds:

  [Customise this paragraph to your specific situation. Examples:
  - "I was admitted to hospital on [date] and underwent emergency surgery, with my recovery period extending through [end date]. During this time I was unable to access my financial records or use a computer. I have enclosed copies of the hospital admission letter and discharge summary as supporting evidence."
  - "My partner of [N] years passed away on [date]. The combination of bereavement, funeral arrangements, and managing their estate meant I was unable to attend to my own tax affairs during the filing window. I have enclosed a copy of the death certificate as supporting evidence."
  - "I attempted to file online via HMRC's website on [date], well before the deadline. The system displayed an error message that prevented submission. I subsequently tried [N] more times before the deadline without success. Screenshots of the error messages are enclosed."]

  Once the circumstances giving rise to the reasonable excuse no longer applied, I [filed the return / arranged payment / [other action]] without unreasonable delay, on [date].

  I ask that the penalty be cancelled. I am happy to provide further information or evidence if required.

  Yours faithfully,

  [Your signature]
  [Your printed name]

  Enclosures: [list supporting evidence]