How long do I have to appeal an HMRC decision?

30 days from the date of the HMRC decision letter to request informal reconsideration (stage 1). Another 30 days from the stage 1 outcome to request a formal Statutory Review (stage 2). Another 30 days from the Review Conclusion to appeal to the First-tier Tribunal (stage 3). Each deadline is strict — miss it and you lose the right to appeal.

Does it cost anything to appeal a tax bill to the Tribunal?

For most tax appeals under £20,000 disputed, the First-tier Tribunal is free. The Tribunal operates a no-costs regime — even if you lose, you don't usually have to pay HMRC's legal costs. Larger cases or Upper Tribunal appeals can have fees and costs risk.

Do I have to pay the disputed tax while I appeal?

Usually no — you can ask HMRC to postpone the disputed tax pending appeal (form WTA1 for income tax disputes). HMRC almost always agrees. However, interest still accrues during the dispute period, so if you ultimately lose, you pay interest from the original due date. For penalties, pay first and reclaim if you win.

How to dispute a tax bill in the UK — the formal appeal process

Last reviewed by the UK Tax Drag editorial team · 12 May 2026 · How we review · Next review due 12 November 2026 · See what changed · Report an error

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To dispute an HMRC decision: (1) write to HMRC within 30 days of the decision letter requesting reconsideration; (2) if HMRC upholds, request a formal Statutory Review (different HMRC officer, must respond within 45 days); (3) if still not resolved, appeal to the First-tier Tribunal (Tax Chamber) within 30 days of the review decision. Time limits at each stage are strict — miss them and you lose the right to appeal. Most disputes settle at stages 1-2; only complex or principle cases reach the Tribunal.

What you can appeal against

A tax assessment (Self Assessment, corporation tax, VAT)
A penalty notice (late filing, late payment, inaccuracy)
A tax code change you don't agree with
A refund refusal
An HMRC decision on residence, domicile, eligibility for a relief
A Closure Notice ending an HMRC enquiry
HMRC's view on a specific transaction (under "judicial review" or Tribunal route)

You generally can't appeal HMRC's processing speed or service quality.For those, use the complaints process (separate from appeals). You'd file a complaint with HMRC's complaints team; if unresolved, escalate to the Adjudicator's Office or Parliamentary Ombudsman.

Stage 1: Informal disagreement

Time limit: 30 days from the HMRC decision letterWrite to HMRC at the address on the decision letter. State that you don't agree with the decision and ask for it to be reconsidered. Include all relevant evidence (P60s, bank statements, contract terms, etc.). Keep the letter under 2 pages but include all supporting documents.

What HMRC doesThe original decision-maker (or someone in their team) reviews your evidence and either confirms, withdraws, or amends the original decision. Decision letter from this stage is the trigger for stage 2 if you still disagree.

Typical timeline30-60 working days for HMRC's reply. Complex cases (multiple years, transfer pricing, residence) take 90+ days.

Stage 2: Statutory Review

Time limit: 30 days from the stage 1 decisionRequest a formal Statutory Review in writing. A different HMRC officer (not the original decision-maker) reviews the case independently. You can submit additional evidence at this stage.

How to requestWrite to HMRC at the address on the stage 1 decision letter. State: "I request a formal Statutory Review under Section 49B Taxes Management Act 1970 [or the equivalent section for your tax type]. The case reference is [X]. I disagree with the decision because [summary]. I have already raised this informally on [date] and the decision was upheld."

HMRC's response timeframeHMRC must respond within 45 days (extendable by mutual agreement). The reviewer can: confirm the original decision, vary it (e.g. reduce a penalty), or cancel it. You'll receive a written Review Conclusion letter.

Statutory Reviews succeed about 30% of the timeHMRC's own data (latest available 2024). The success rate is higher for penalty appeals than for substantive tax assessment disputes. The review process is free.

Stage 3: First-tier Tribunal (Tax Chamber)

Time limit: 30 days from the Statutory Review conclusionIf you don't accept the Statutory Review outcome, you can appeal to the First-tier Tribunal (Tax Chamber). The Tribunal is independent of HMRC — it's part of the UK justice system.

How to appealForm Notice of Appeal (download from gov.uk/tax-tribunal). Submit by post or email to the Tribunal. Include the Statutory Review letter, your grounds of appeal, and any evidence. No fee for most tax appeals (under £20k tax) — small fee for larger cases.

The Tribunal processThe Tribunal acknowledges your appeal within 1-2 weeks. HMRC responds with their grounds within 60 days. There may be a "Case Management" hearing (procedural, often by telephone). The substantive hearing happens 6-18 months later. You can represent yourself or hire a tax barrister.

At the hearingYou present evidence and arguments. HMRC presents theirs. A Tribunal Judge (sometimes with a non-judicial member) decides. The decision is written and binding — but you can appeal to the Upper Tribunal on a point of law if you lose.

Costs and risk

Stage	Fee	Costs risk if you lose
Stage 1: Informal	£0	None (just the disputed tax)
Stage 2: Statutory Review	£0	None
Stage 3: First-tier Tribunal	£0 most cases / fee schedule for larger	Generally none (no costs awarded unless unreasonable behaviour)
Stage 4: Upper Tribunal	£200 (some cases)	Costs can be awarded against you for losing
Stage 5: Court of Appeal	Substantial	Substantial costs risk

First-tier Tribunal is "litigant-friendly"FTT operates a no-costs regime — losing doesn't usually mean paying HMRC's legal fees. This makes it the practical limit for ordinary taxpayers. The Upper Tribunal is more expensive and has costs risk.

When to use a tax adviser

Stage 1-2: probably DIYMost penalty appeals and simple disputes are well within DIY territory. The HMRC reviewer applies clear rules. Save adviser fees for cases where HMRC's view is materially wrong or complex.

Stage 3 (Tribunal): hire helpFor Tribunal hearings, the rules of evidence and procedure are technical. A Chartered Tax Adviser (CTA) or tax barrister adds significant value. Costs typically £2,000-£10,000 for a Tribunal case prep + hearing. Worth it if the disputed tax is £10k+.

When facts are at issueIf the dispute is about events (was income earned, what was paid, was there a transaction), prepare detailed evidence and witness statements. An adviser helps structure this.

When law is at issueIf the dispute is about interpretation of tax law (e.g. residency, transfer pricing, IR35), the technical legal arguments are usually beyond ordinary DIY. Hire a tax specialist.

Common mistakes that lose disputes

Mistake 1: Missing the 30-day deadlines.The time limits are strict. Miss one and the right to appeal is lost. Diary the deadlines from each HMRC letter.

Mistake 2: Sending the appeal to the wrong address.Each tax type has different appeal addresses. Use the address printed on the HMRC decision letter, not a generic HMRC address.

Mistake 3: Not paying the disputed tax in the meantime.Tax is due even while appealed. HMRC charges interest from the original due date if you eventually lose. Pay under protest if you can afford to — you'll be refunded with interest if you win.

Mistake 4: Weak evidence."I think it's wrong" is not enough. Bring documents: contracts, payslips, P60s, bank statements, correspondence. The reviewer/judge weighs evidence, not feelings.

Mistake 5: Over-arguing peripheral points.Focus on one or two strong grounds. Throwing in 10 weak arguments dilutes your case. Identify the core issue and stick to it.

Pay first, appeal later — or appeal first?

For most tax types you can defer paymentYou can ask HMRC to "postpone" disputed tax until the appeal is settled. Form WTA1 or similar. HMRC agrees in most cases. Interest still accrues — so if you lose, you pay interest from the original due date.

For penalties: usually pay firstPenalties are due immediately even if appealed. If you win, HMRC refunds. Worth paying to stop further surcharges accumulating.

Use the HMRC Response Centre

Got a confusing HMRC letter? The Response Centre identifies what HMRC letter you have and the right action by query type.

Open the HMRC Response Centre →

Sources and references

Appeal framework from gov.uk/tax-appeals. Statutory review process from HMRC Appeals, Reviews and Tribunals manual. First-tier Tribunal at gov.uk/tax-tribunal. Tax Tribunal procedure rules from Tribunal Procedure Rules 2009.

UK Tax Drag is not authorised by the Financial Conduct Authority and does not provide regulated financial or tax advice — see the content disclaimer for the full position. The methodology page documents how every guide is built and reviewed.

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