A penalty notice from HMRC lands with a stomach-dropping thud, but it is not the final word. The UK tax system is built around a layered appeals framework that gives every taxpayer multiple opportunities to challenge an assessment or penalty before it becomes binding. The trick is understanding the timeline, because rights expire fast and HMRC has no obligation to remind you that a deadline has passed.
The 30-day window
When HMRC issues a penalty notice, you generally have 30 days from the date on the notice to either pay, accept, or appeal. The same 30-day clock applies to most direct tax decisions — Self Assessment surcharges, late filing penalties, accuracy penalties under Schedule 24 Finance Act 2007, and information notice penalties. Miss the window and HMRC can refuse a late appeal unless you can demonstrate that the delay itself had a reasonable excuse.
Step one: ask for a statutory review
The first formal route is to request an internal HMRC review by an officer who has not previously been involved in the case. This is free, costs you no court fees, and crucially, it pauses the clock for tribunal purposes. The reviewing officer has 45 days (extendable by agreement) to look at the file afresh and either uphold, vary, or cancel the decision. In our experience, reviews succeed more often than directors expect, particularly where the original officer made a procedural error or applied the wrong penalty percentage.
Step two: alternative dispute resolution (ADR)
If the review goes against you — or if you would rather skip it — ADR is HMRC's mediation pathway. A trained HMRC mediator (independent of the case team) facilitates a structured conversation, often by video conference, to identify whether there is a settlement that both sides can accept. ADR is voluntary, confidential, and without prejudice, meaning anything said cannot be used against you later. It works best where the dispute is partly factual (what evidence was reviewed, how a figure was computed) rather than purely legal.
Step three: the First-Tier Tax Tribunal
If review and ADR do not resolve matters, the First-Tier Tax Tribunal (FTT) is the formal court of first instance for tax appeals. You must lodge your appeal within 30 days of the review conclusion letter, using form T240, with a £20 to £170 fee depending on case complexity. The FTT is intentionally less formal than higher courts — judges include both legally qualified members and tribunal members with accountancy or tax backgrounds, and many appellants represent themselves successfully.
Cases are categorised as "default paper" (decided on documents), "basic" (a short hearing), "standard", or "complex". Most penalty appeals are basic or standard. The hearing itself is open to the public but rarely attended by anyone except the parties.
Onwards: Upper Tribunal and beyond
If the FTT decides against you and you believe there was an error of law (not merely a factual disagreement), you can apply for permission to appeal to the Upper Tribunal. Beyond that lies the Court of Appeal and, very rarely, the Supreme Court. But for the vast majority of penalty disputes, matters are resolved at review, ADR, or the FTT.
What appeals tend to succeed on
From general practitioner experience, the appeals most likely to be allowed share certain features: a documented reasonable excuse with contemporaneous evidence; a clear procedural error by HMRC (wrong taxpayer, wrong year, wrong penalty band); or a misapplication of behaviour categories (HMRC alleging "deliberate" where the facts support only "careless"). Appeals that rely on emotional grounds — "we have been good clients for 20 years" — rarely succeed unless paired with evidence of a specific failure event.
Practical preparation
- Diary every deadline. The 30 days runs from the notice date, not the date you received it.
- Gather contemporaneous evidence. Bank statements, emails, doctor's letters, HMRC's own outage notices. Evidence created at the time carries far more weight than reconstructions.
- Frame the issue precisely. Are you challenging the underlying tax, the behaviour category, the penalty percentage, or the existence of a reasonable excuse? Each has a different evidence requirement.
- Get representation. Many appeals fail not because the facts are weak but because the case was not framed in tribunal language. Our business advisory team works with specialist tax counsel where appropriate.
This article is general guidance, not legal advice — every penalty appeal turns on its specific facts and you should always seek tailored input. If you have received a penalty notice and want a confidential review before the 30-day clock expires, book a call or reach us via our contact page. We have walked many directors through the full review-to-tribunal pathway and the earlier we engage, the wider the options remain.