How long does an HMRC tax enquiry typically take in the UK?

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How Long Does an HMRC Tax Enquiry Take? HMRC has the power to open an enquiry into any Self Assessment return within 12 months of the filing deadline (the 'enquiry window'). Enquiries can also be opened outside this window if HMRC suspects fraud or has received information suggesting undisclosed income (using 'discovery' powers). The length of an enquiry varies enormously by type and complexity. Types of HMRC enquiry 1. Aspect enquiry -- HMRC queries a specific item or figure on the return (for example, a particular expense claim or a capital gains entry). These are the quickest to resolve, typically three to six months if the taxpayer responds promptly with clear documentation. 2. Full enquiry -- HMRC examines the entire tax return. These are more serious and can take one to two years for straightforward cases, and two to five years or more where records are poor, there is significant complexity, or the taxpayer disputes findings. 3. Code of Practice 8 (COP8) -- Used where HMRC suspects tax avoidance arrangements (not fraud). These investigations routinely last two to four years. 4. Code of Practice 9 (COP9) -- Serious fraud investigation under the Contractual Disclosure Facility. HMRC may investigate multiple tax years (up to 20 years back in fraud cases). These often take three to seven years and sometimes longer. Factors that affect duration - Speed of the taxpayer's responses -- delays in providing documents significantly extend enquiries - Complexity of affairs (offshore accounts, multiple income sources, company structures) - Number of tax years under review - Whether specialist HMRC units (such as Fraud Investigation Service) are involved - Whether the case proceeds to a tax tribunal Dispute resolution options If you disagree with HMRC's conclusions, you can: - Request a statutory review by an HMRC officer not involved in the case (usually within 30 days) - Appeal to the First-tier Tax Tribunal (independent of HMRC) - Use the Alternative Dispute Resolution (ADR) process for complex cases Protecting yourself during an enquiry - Appoint a tax adviser or accountant immediately upon receiving a notice of enquiry - Do not contact HMRC directly without taking advice - Preserve all records -- HMRC can request records going back six years (20 years in fraud cases) - Keep correspondence in writing HMRC must formally close an enquiry by issuing a closure notice. If HMRC delays unreasonably, the taxpayer can apply to the tribunal for a direction compelling HMRC to close the enquiry.

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