--- title: "Late Appeals Against HMRC: Is It Too Late?" url: https://taxdisputes.co.uk/2026/09/late-appeals-against-hmrc-is-it-too-late/ date: 2026-09-04 modified: 2026-09-04 lang: en author: "Tax Dispute Solicitors" description: "Missing the deadline to appeal an HMRC decision feels final, but it usually is not. Both HMRC and the tax tribunal can admit an appeal made outside the statutory window, and applications succeed regularly where the delay is properly explained. This article sets out the two routes available, what counts as a reasonable excuse, and what to do if enforcement has already started." categories: - "First Tier Tax Tribunal" - "HMRC" - "HMRC Assessments" - "HMRC Penalty" - "Late filing penalties" - "Report on HMRC" - "Tax Investigation" - "Tribunal Proceedings" tags: - "accountant missed deadline" - "Closure Notice Appeal" - "First-tier Tribunal late appeal" - "HMRC appeal deadline" - "HMRC assessment appeal" - "HMRC Enforcement Action" - "HMRC internal review" - "late appeal HMRC" - "missed 30 day deadline" - "out of time appeal" - "permission to appeal late" - "professional negligence tax" - "reasonable excuse HMRC" - "statutory demand set aside" - "tax tribunal application" - "VAT appeal deadline" image: https://taxdisputes.co.uk/wp-content/uploads/2026/09/Late-Appeals-Against-HMRC-Is-It-Too-Late-1024x683.png word_count: 1363 --- # Late Appeals Against HMRC: Is It Too Late? ***Missing the deadline to appeal an HMRC decision feels final. It usually is not. Both HMRC and the tax tribunal have power to accept an appeal made outside the statutory window, and applications succeed regularly where the delay is explained properly and the case has substance. What determines the outcome is rarely the length of the delay on its own. It is the quality of the explanation and how quickly the taxpayer acted once they realised.*** ## The Standard Deadline and What It Applies To For most direct taxes, a taxpayer has thirty days from the date of an appealable decision to appeal. That covers assessments, amendments to returns, closure notices at the end of an [HMRC enquiry](https://taxdisputes.co.uk/hmrc-tax-investigations/), and most [penalty determinations](https://taxdisputes.co.uk/hmrc-penalties/). The appeal is made to HMRC first, and only reaches the tribunal afterwards. Indirect taxes work differently. For VAT and similar matters the appeal is notified directly to the First-tier Tribunal rather than to HMRC, though the same thirty day period generally applies. That procedural difference catches people out, and a taxpayer who sends a VAT appeal to the wrong destination may find time has run out while they waited for a reply. Our [VAT dispute solicitors](https://taxdisputes.co.uk/hmrc-vat-investigations-evasion-input-ouput-double-taxation-tribunal-legal-advice/) deal with that scenario often, and our [tribunal team](https://taxdisputes.co.uk/first-tier-tax-tribunal-solicitors-london/) handles the applications that follow. ## The Two Routes Available After the Deadline Passes The first route is HMRC itself. HMRC has a statutory discretion to accept a [late appeal](https://taxdisputes.co.uk/hmrc-internal-review-appeals-solicitors-london/) where the taxpayer had a reasonable excuse for not appealing in time and appealed without unreasonable delay once the excuse ended, a discretion our [taxation solicitors](https://lexlaw.co.uk/practice-areas/taxation-solicitors-london/) engage with regularly. This is the cheaper and faster option, and it should always be attempted first. A properly argued letter to HMRC, supported by evidence, resolves a significant proportion of these situations without any application to court. The second route opens if HMRC refuses. The taxpayer can then apply to the First-tier Tribunal for permission to notify the appeal late, and the tribunal decides the question afresh rather than reviewing HMRC's refusal. That is a meaningful advantage, because the tribunal is not bound by HMRC's view of the excuse. Our [tax appeal lawyers](https://taxdisputes.co.uk/hmrc-appeal-lawyers-london/) prepare both stages, and our wider [tribunal representation practice](https://lexlaw.co.uk/first-tier-tax-tribunal-hmrc-representation-solicitor-london/) covers the hearing itself. ## How the Tribunal Approaches a Late Application The [tribunal](https://taxdisputes.co.uk/first-tier-tax-tribunal-solicitors-london/) works through a settled sequence. It first assesses whether the delay was serious and significant. A few days will rarely trouble it. Several months usually will, and at that point the taxpayer needs a genuine explanation rather than an apology, prepared with the assistance of [specialist representation](https://taxdisputes.co.uk/legal-representation/). It then examines the reason for the delay. Serious illness, the death of a family member, a document that never arrived at the correct address, or an adviser who failed to act all carry real weight. Ignorance of the deadline carries very little, and a taxpayer who simply hoped the problem would resolve itself will struggle. Finally the tribunal weighs everything in the round, including the prejudice to each side, the importance of statutory time limits, and whether the underlying appeal has any realistic prospect of success. That last factor is why a late application should always be accompanied by a proper analysis of the merits from your [tax dispute solicitors](https://taxdisputes.co.uk/hmrc-tax-investigations-solicitors-london/). ## What Counts as a Reasonable Excuse There is no statutory definition, which gives the concept useful flexibility. Circumstances that have succeeded include hospitalisation, bereavement, postal failures where the taxpayer can show the decision never arrived, and situations where an accountant or agent was instructed and did not act, which may itself found a [claim against that adviser](https://professionalnegligenceclaimsolicitors.co.uk/professional-negligence-claims/) as well as supporting the [appeal application](https://taxdisputes.co.uk/hmrc-appeal-lawyers-london/). Circumstances that reliably fail include pressure of work, being unaware of the rules, and a belief that a telephone conversation with HMRC had settled the matter. One requirement is frequently overlooked. The excuse must not only explain the original delay, it must also cover the period afterwards. A taxpayer who was seriously ill for two months but then waited a further eight months before appealing has an excuse for the first period and none for the second. Acting immediately on discovering the position is the single most useful thing a taxpayer can do, and where [enforcement action](https://taxdisputes.co.uk/hmrc-enforcement-action/) has already begun, speed becomes critical. ## Why Enforcement Changes the Picture An unappealed assessment hardens into an enforceable debt. HMRC can then take money directly from bank accounts, instruct [enforcement agents](https://taxdisputes.co.uk/hmrc-enforcement-action/), or move to [insolvency proceedings](https://windinguppetitionsolicitors.co.uk/what-is-the-process-of-winding-up-procedure/). Many taxpayers only discover an old assessment exists when a statutory demand arrives, which is a poor moment to be arguing about a deadline that expired two years earlier. Applying for permission to appeal late does not automatically stop collection. Where a statutory demand has been served, separate steps are needed, and there may be grounds to [set the demand aside](https://windinguppetitionsolicitors.co.uk/statutory-demand-set-aside-lawyers-london-hmrc/) on the basis that the debt is disputed. Where proceedings have advanced further, our guidance on [bankruptcy petitions](https://windinguppetitionsolicitors.co.uk/bankruptcy-advice/) and on [opposing a winding up petition](https://windinguppetitionsolicitors.co.uk/opposing-a-winding-up-petition/) sets out the position for individuals and companies respectively. ## When Your Adviser Was the Cause of the Delay A significant number of missed deadlines are not the taxpayer's fault at all. An accountant who received the [closure notice](https://taxdisputes.co.uk/hmrc-tax-investigations/) and failed to appeal, or who told the client the matter was in hand when it was not, has caused a loss the client may be entitled to recover through a [court claim](https://professionalnegligenceclaimsolicitors.co.uk/start-issue-professional-negligence-court-claim-case-legal-advice/). Two separate points follow from that. The adviser's failure may support the late appeal application itself, since it goes directly to the reason for the delay. Separately, it may found a claim, and our sister site addresses [professional negligence claims](https://professionalnegligenceclaimsolicitors.co.uk/professional-negligence-claims/) and the [limitation periods](https://professionalnegligenceclaimsolicitors.co.uk/limitation-period-in-professional-negligence-claims/) that apply to them. Pursuing the tax appeal and the negligence claim in the right order matters, since the value of the claim usually depends on what the appeal recovers. ## What to Do Now if Your Deadline Has Passed Establish the exact date of the decision and the exact date you became aware of it, because those two dates govern everything that follows. Gather the evidence that explains the gap, whether that is correspondence with an agent or proof of a change of address, and take advice from [tax appeal solicitors](https://taxdisputes.co.uk/hmrc-tax-appeals-solicitors-london/) before you send it, since [what you write becomes evidence](https://lexlaw.co.uk/hmrc-tax-investigation-penalty-advice-solicitors/). Then write to HMRC requesting that the late appeal be admitted, setting out both the excuse and the substance of the appeal. If HMRC refuses, move promptly to the tribunal rather than continuing to correspond. Further delay at that stage weakens the application, and the tribunal will notice it. Where an [internal review](https://taxdisputes.co.uk/hmrc-internal-review-appeals-solicitors-london/) is also available it can run alongside, and where HMRC has behaved unlawfully in its handling of the matter, [judicial review](https://taxdisputes.co.uk/judicial-review-applications-against-hmrc-challenge-decision-advice/) may provide an additional route. ## How We Can Help Our dual qualified solicitors and barristers prepare late appeal applications for both HMRC and the tribunal, assemble the supporting evidence, and argue the application at hearing. We also assess the underlying merits at the outset, because an application unsupported by a credible appeal rarely succeeds and rarely deserves to. Our [tax appeals practice](https://taxdisputes.co.uk/hmrc-tax-appeals-solicitors-london/) covers the full range of direct and indirect tax disputes. If your deadline has passed, act today rather than next week. Contact us through our [case assessment form](https://taxdisputes.co.uk/legal-case-assessment/), or read more about our approach to [specialist tax representation](https://taxdisputes.co.uk/legal-representation/) and our [penalty appeal work](https://lexlaw.co.uk/hmrc-tax-penalty-appeal-solicitor-london/). ### Frequently Asked Questions (FAQs) 1. How late is too late to appeal an HMRC decision? There is no absolute cut-off. Applications have succeeded years after the deadline where the explanation was compelling. The length of delay is only the starting point, and our [appeal lawyers](https://taxdisputes.co.uk/hmrc-appeal-lawyers-london/) assess each case on its own facts. 2. Will HMRC accept a late appeal without going to the tribunal? Often, yes. HMRC has discretion to admit a late appeal where there was a reasonable excuse. A properly evidenced request resolves many cases, and our [review and appeals team](https://taxdisputes.co.uk/hmrc-internal-review-appeals-solicitors-london/) prepares them. 3. Does a late appeal stop HMRC collecting the debt? Not automatically. Collection may continue, so separate steps are needed where a statutory demand has been served or [enforcement action](https://taxdisputes.co.uk/hmrc-enforcement-action/) has begun. Take advice on both fronts together. 4. My accountant missed the deadline. Does that help me? It can support the application, since it explains the delay. It may also give rise to a separate [professional negligence claim](https://professionalnegligenceclaimsolicitors.co.uk/professional-negligence-claims/) against the adviser, subject to [limitation](https://professionalnegligenceclaimsolicitors.co.uk/limitation-period-in-professional-negligence-claims/). 5. What evidence should I gather before applying? The decision date, the date you became aware of it, and documentary proof of whatever caused the gap. Our [tax dispute solicitors](https://taxdisputes.co.uk/hmrc-tax-investigations-solicitors-london/) will tell you what will carry weight before you send anything.