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Template · HMRC
HMRC Late Filing Penalty Appeal Template (UK, Free Download)
Formal appeal against an HMRC late filing penalty based on a reasonable excuse.
Built by a practising Chartered Accountant · Unlimited users · 60-day free trial · Last updated 23 September 2026
Quick answer
If you have a reasonable excuse for filing a tax return late, you can appeal an HMRC penalty. You must typically do this within 30 days of the penalty notice. [VERIFY] Many appeals can now be submitted online through your HMRC online account.
Who is this sent to, and when?
- Sent to
- HMRC
- When to send it
- Within 30 days of penalty notice
What counts as a reasonable excuse for HMRC?
HMRC considers unexpected events that you could not have avoided, such as serious illness, a death in the family, or major software issues.
Excuses like 'I forgot' or 'my accountant let me down' are rarely accepted unless there are exceptional circumstances. Provide evidence where possible.
Can I appeal an HMRC penalty online?
Yes, for many penalties like Self Assessment, you can use the 'Appeal a penalty' service within your HMRC online account.
Filing online is usually faster than sending a letter. However, a formal letter is still useful for complex cases where you need to attach significant supporting evidence.
Preview the template
Check the current process on GOV.UK before sending — many requests are now made online.
HMRC Late Filing Penalty Appeal Template
Appeal against Late Filing Penalty
HMRC
[Relevant HMRC Address, e.g., Self Assessment, HM Revenue and Customs, BX9 1AS]
Date: [Date]
Client Name: [Client Name]
UTR: [UTR]
Penalty Reference: [Penalty Reference Number]
Dear Sir/Madam,
I am writing to formally appeal against the late filing penalty of £[Amount] issued on [Date of Penalty Notice] for the tax year/period ending [Date].
The
Preview shows the opening and key sections. The full editable file is free to download below.
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Send this from Remindoo
Save it once in Remindoo and send it from there. Store the wording as an email template, then use tokens so client names, company numbers and dates fill in automatically. Send it to one client or to a filtered group with bulk client emails. For requests that repeat, pair it with automated reminders and a recurring task so it goes out every period without anyone remembering.
What are the common mistakes?
- Filing the appeal before the return is actually filed
- Using a weak or invalid excuse
- Missing the 30-day appeal deadline
- Not including the penalty reference number
“Automation saves time and no follow-up is missed.”
Frequently asked questions
When is the deadline to appeal?
Usually within 30 days of the date on the penalty notice.
What if I missed the 30-day deadline?
You can still try to appeal if you have a reasonable excuse for the delay in appealing, but it is much harder to get accepted.
Do I need to pay the penalty first?
You are usually expected to pay, but you can request a stay of collection while the appeal is considered.
What evidence should I provide?
Medical notes, death certificates, or proof of system failure (screenshots) are all good evidence.
Can my accountant sign the appeal?
Yes, if they are your authorised agent with HMRC (form 64-8).
What happens after I send the appeal?
HMRC will review it and either accept the appeal and cancel the penalty, or reject it and explain why.
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Sources
Last updated 23 September 2026. General guidance, not regulatory advice.
Why recording every task matters in an accountancy practice
Accounting firms run on deadlines: VAT returns, payroll, confirmation statements, accounts and Self Assessment. Recording every job as a task, with an owner and a date, is the simplest way to make sure nothing is missed.
Avoid penalties
HMRC and Companies House charge penalties for late filing. A task for every deadline, with an internal date before it, gives the team a buffer.
Nothing depends on memory
Recorded tasks mean work continues when someone is off sick, on leave or has left the firm.
Consistent quality
Subtask checklists make every job follow the same steps and reviews, whoever does the work.
Visibility for managers
Filters by owner, status and deadline show at a glance what is late, what is due and who needs help.
Practical tips from UK practice
- Set an internal deadline two to four weeks before every statutory deadline.
- Use recurring tasks for repeat work such as VAT, payroll and bookkeeping.
- Break larger jobs into subtasks, including a review step.
- Comment on the task instead of by email, so the history stays with the work.
Related Remindoo features
Written and reviewed by Waqas Sagar ACA FCCA FMAAT, Chartered Accountant with 18+ years in practice. Founder and MD of Accotax, an ICAEW, ACCA and AAT regulated London practice that has served over 5,000 clients, and founder of Remindoo. Guidance is general; check current GOV.UK and professional body guidance for your firm.
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