UK HMRC Enquiry Survival Guide 2026/27

QWhat is an HMRC enquiry + how does it start?

HMRC enquiry = formal investigation under Section 9A TMA 1970 (income tax) or Schedule 18 Para 24 FA 1998 (corporation tax). Enquiry notice: HMRC letter "Notice of Enquiry" stating intent to enquire into specific SA return. Time limits: (1) Standard 12 months from filing deadline for normal enquiry. (2) Up to 4 years for careless behaviour. (3) Up to 6 years for behaviour requiring more care. (4) Up to 20 years for deliberate non-disclosure. Types of compliance activity: (a) Full enquiry: comprehensive review. Severe. (b) Aspect enquiry: specific item only. Most common. (c) Discovery assessment: HMRC found error after closure date. (d) Nudge letter: informal request to review position. Not formal enquiry. (e) COP9 / Contractual Disclosure Facility (CDF): serious fraud route (separate guide). Common triggers: (1) Random selection: 5-10% of cases. (2) Risk profiling: HMRC Connect data analytics. (3) Specific intelligence: tip-off, bank data, digital platform reports. (4) Industry sweeps: CIS, landlord, crypto, hospitality. (5) Inconsistencies: SA vs lifestyle. First action on receipt: (a) DON'T PANIC: most enquiries resolve without major issue. (b) Read notice carefully: scope of enquiry. (c) Note 30-day deadlines: information requests. (d) Engage tax professional: especially if amounts substantial.

QInformation notices + what HMRC can demand

Schedule 36 Finance Act 2008: HMRC's main information-gathering power. Types of notice: (1) Taxpayer Notice: requires you provide information / documents. (2) Third Party Notice: e.g., your bank, accountant - HMRC can require info about you. (3) Identity Notice: where HMRC doesn't know your identity. What HMRC can demand: (a) Bank statements: usually 6 years. (b) Business records: invoices, expense receipts. (c) Personal records of relevance. (d) Reasonable but defined scope. Limitations: (1) Reasonably required: must relate to checking tax position. (2) Statutory records: 6-year retention period. (3) Cannot demand legally privileged communications: solicitor advice. (4) Auditor working papers: limited protection. (5) Personal records: HMRC must justify. Response time: typically 30 days. Extension reasonable. Penalties for non-compliance: (a) £300 initial penalty. (b) £60 / day continuing. (c) Up to £3,000 for inaccurate response. Tax-geared penalty for serious non-compliance. Appeal rights: (1) Internal review of notice: 30 days. (2) First-tier Tribunal. Strategic approach: (1) Don't ignore: penalties stack quickly. (2) Respond fully + accurately: HMRC views partial responses suspiciously. (3) Professional adviser handles correspondence: reduces stress + improves outcomes.

QReasonable excuse defence

Reasonable excuse: defence against penalties when missing deadline or providing inaccurate information. Statute: various - Schedule 24 FA 2007 + Section 118 TMA 1970. Examples accepted by HMRC: (1) Serious illness: hospitalisation, mental health breakdown, terminal diagnosis. Of taxpayer or close family. (2) Bereavement: close family death days/weeks before deadline. (3) Software / system failure: documented HMRC outage. (4) Postal disruption: less relevant for digital. (5) Natural disaster: fire, flood. (6) Theft or destruction of records. NOT reasonable excuse: (a) "I forgot". (b) Pressure of work. (c) Accountant didn't file: taxpayer remains responsible. (d) Couldn't afford to pay: cash flow not reasonable excuse. (e) Ignorance of obligation. Test: "What a reasonable person would have done in the circumstances". How to claim: (1) Written submission with evidence: medical letters, death certificates, photos. (2) Within 30 days of penalty notice: appeal window. (3) HMRC reviews: typically 8 weeks. (4) Appeal to Tribunal if rejected: 30 days from decision. Success rate: ~30-40% of well-documented reasonable excuse claims succeed. Specialist tax adviser improves odds: framing + evidence presentation.

QAlternative Dispute Resolution (ADR)

ADR: structured mediation between taxpayer + HMRC. Free service: HMRC offers. When ADR appropriate: (1) Disagreement on facts: clarification beyond letter exchange needed. (2) Communication breakdown: positions entrenched. (3) Complex technical issues: facilitator helps. (4) Before Tribunal: cheaper + faster than litigation. (5) Settlement potential exists: both sides willing. NOT suitable: (a) Pure legal interpretation (no facts in dispute): tribunal better. (b) Criminal investigation: COP9 instead. (c) Avoidance scheme litigation: legal precedent needed. Process: Step 1 - Application: by taxpayer or HMRC. Step 2 - HMRC review of suitability. Step 3 - Facilitator assigned: independent of original officer. Step 4 - Pre-meeting: brief facilitator. Step 5 - ADR meeting: 1-2 days typically. Taxpayer + HMRC + facilitator. Step 6 - Outcome: settlement or no agreement. Step 7 - If settled: formal closure notice. Step 8 - If no agreement: enquiry continues + tribunal route open. Success rate: ~60% ADR cases settle. Cost: HMRC bears their costs. Taxpayer typically £2-£20k professional fees depending on complexity. Strategic value: faster than Tribunal (Tribunal queue 1-2 years currently). Often better commercial outcome.

QFirst-tier Tribunal appeal process

First-tier Tribunal (Tax): independent judicial body. Appeals against HMRC decisions: assessments, penalties, information notices. Tracks: Default Paper: simple, written submissions only. Basic: short hearing, simple legal issues. Standard: full hearing, complex cases. Complex: most demanding. Process: Step 1 - Internal review request: 30 days from HMRC decision. FREE. ~30% reversed. Step 2 - If review unsuccessful: tribunal appeal within 30 days. Step 3 - Submit notice of appeal Form Tax-1: outline grounds. £20-£150 fee depending on case. Step 4 - HMRC statement of case: their position. Step 5 - Document exchange + witness statements. Step 6 - Hearing: judge + sometimes member. Few weeks to multiple days. Step 7 - Decision: typically within 3 months of hearing. Step 8 - Upper Tribunal appeal: on law not facts. Step 9 - Court of Appeal: rare. Cost: (1) Self-represented: minimal £20-£150 fee. (2) Professional representation: £5-£50k typical. (3) Costs awards rare: each party usually bears own. Success rate: ~20% of FTT tax appeals succeed in part or whole. Higher for well-prepared technical arguments. Strategic considerations: (1) Cost-benefit: legal cost vs amount at stake. (2) Likelihood of success: realistic assessment. (3) Time: 12-24 months typical hearing wait. (4) Settlement during process: HMRC may negotiate. (5) Precedent value: published decisions affect future cases.

QPenalty negotiation Schedule 24 FA 2007

Schedule 24 FA 2007 penalty framework for inaccurate returns. 4 behaviour categories: (1) Reasonable care taken: 0% penalty. (2) Careless: 0-30% of tax. (3) Deliberate: 20-70% of tax. (4) Deliberate + concealed: 30-100% of tax. Prompted vs unprompted: unprompted disclosure (before HMRC contact) = lower band. Disclosure quality factors: telling + helping + giving access (TUG). Maximum 40% reduction within band. Worked example - £20k tax underpayment: Reasonable care: £0 penalty. Careless unprompted + full cooperation: 0% × £20k = £0. Careless prompted minimum: 15% × £20k = £3,000. Careless prompted maximum: 30% × £20k = £6,000. Deliberate prompted: 35-70% × £20k = £7,000-£14,000. Deliberate + concealed prompted: 50-100% × £20k = £10,000-£20,000. Strategic positioning: (1) Argue reasonable care category: 0% penalty if successful. Document care taken. (2) If careless: maximise disclosure cooperation. (3) Avoid deliberate categorisation: significant rate jump. (4) Voluntary unprompted disclosure: dramatically lower penalty. (5) Specialist tax adviser argues categorisation: technical framing matters. Suspended penalty: penalty waived if conditions met (typically improved compliance going forward).

QTime limits for HMRC + you

HMRC time limits to open enquiry / assess: Section 9A TMA 1970. (1) Normal enquiry: 12 months from filing deadline (1 February for SA). (2) Discovery assessment careless behaviour: 6 years from end of tax year. (3) Discovery deliberate behaviour: 20 years from end of tax year. (4) Offshore matters: 12 years (RTC rules expanded historic). Your time limits: (1) Respond to information notice: 30 days typically. (2) Appeal HMRC decision: 30 days. (3) Internal review request: 30 days. (4) Tribunal appeal (after review): 30 days. (5) Provide further information requested: agreed deadline (typically 30 days). Late response consequences: (a) Penalty notice. (b) Default assessment: HMRC estimates owed amount + assesses. (c) Enquiry closed unfavourably: limited later appeal. Diary management: (1) Calendar HMRC deadlines. (2) Multiple reminders. (3) Allow buffer for review by adviser. (4) Submit before deadline + retain proof of posting. (5) Track HMRC's response deadlines: their slowness can be argued in your favour. HMRC delay tactics: cases can drag 2-5 years. Document delays. May support reasonable behaviour argument.

QWorking with HMRC - communication tactics

Productive HMRC communication strategies: (1) Be polite + professional: HMRC officers human. (2) Cooperative tone: faster resolution. (3) Written correspondence preferred: paper trail. (4) Phone calls followed up in writing: record details. (5) Don't volunteer information beyond what's requested: focus + scope. (6) Use professional adviser as primary contact: reduces stress + improves quality. (7) Meet deadlines + request extensions if needed: don't disappear. (8) Constructive engagement: discuss issues, propose solutions. What NOT to do: (a) Aggressive / threatening language: escalates + harms position. (b) Refuse to engage: discovery assessments + worst outcomes. (c) Concealment / lies: deliberate behaviour penalty + potential criminal. (d) Inconsistent statements: HMRC cross-references. (e) Direct contact with HMRC officer who's been hostile: request reassignment if relationship breakdown. HMRC's Charter: HMRC's published standards. Reference for complaint. Includes: respect, fair treatment, helpfulness, professionalism. Complaint process if HMRC behaves poorly: (1) Initial complaint to HMRC. (2) Second-tier complaint to HMRC Adjudicator. (3) Parliamentary Ombudsman: ultimate independent. (4) Strategic use of complaints: not to bully officer but to address specific failures.

QStrategic checklist - HMRC enquiry survival

End-to-end enquiry management checklist: ON RECEIPT (Days 1-7): (1) Read notice carefully: identify scope + deadlines. (2) Engage tax adviser if substantial: ICAEW / ATT / CIOT for SA cases; specialist tax solicitor for COP9. (3) Acknowledge receipt to HMRC: confirm you'll respond by deadline. (4) Gather relevant records: bank statements, invoices, contracts, receipts. (5) Self-review your position: identify any errors before HMRC does. (6) Consider voluntary disclosure if errors found: lower penalties. EARLY STAGES (Days 7-30): (7) Respond fully to information requests: don't hold back. (8) Provide explanations + context: not just bare documents. (9) Reconcile any discrepancies: explain rationally. (10) Establish open communication with HMRC officer. MIDDLE STAGES: (11) Track HMRC's progress + decisions: log all correspondence. (12) Respond to follow-up requests within deadline. (13) Consider ADR if dispute persists: cheaper than tribunal. (14) Settlement negotiation: penalty band, tax amount, time-to-pay. RESOLUTION: (15) Signed closure notice: HMRC formal closure. (16) Payment via direct debit / lump sum: avoids interest. (17) Time-to-Pay arrangement if needed: 12-36 months typical. (18) Tribunal appeal if disputed: 30-day window. POST-RESOLUTION: (19) Lessons learned: improve systems. (20) Ongoing compliance discipline: HMRC monitors disclosed taxpayers. (21) Annual professional review: catch issues early. (22) Documentation retention 6+ years: future enquiry support. Mental health: (a) Enquiries stressful: 1-3 years typical duration. (b) Professional support + family awareness. (c) Don't bear alone: tax adviser + GP if needed. Average enquiry resolution: (1) Aspect enquiry: 3-9 months. (2) Full enquiry: 1-3 years. (3) Complex / disputed: 3-7 years. (4) Tribunal route: adds 1-2 years. Specialist representation outcome: typically 30-50% lower final settlement vs DIY. Worth £2-20k professional fees on £10k+ disputes.