How to Handle HMRC Investigations and Enquiries — A Founder's Guide (2026)

HMRC opens approximately 300,000 formal investigations per year. Most are random or triggered by inconsistencies. An aspect enquiry (looking at one item on your return) is most common. A full enquiry (everything) is rarer but more intensive. This article covers: what triggers an HMRC enquiry, how to respond, your rights, and whether to use a tax specialist (always yes).