Every year, thousands of self-employed people face an HMRC investigation. If you are being investigated by HMRC, or worried you might be, this guide explains everything you need to know. For taxi drivers and fleet operators, the stakes are particularly high. HMRC investigation activity targets self-employed workers in cash-heavy industries disproportionately.
Types of HMRC Investigation
Aspect Enquiry: HMRC is looking at one specific part of your tax return. For taxi drivers, these often focus on cash income or vehicle expenses.
Full Enquiry: HMRC is reviewing your entire tax return. This usually indicates broader concerns about the accuracy of your filing.
COP8: opened when HMRC suspects tax avoidance. Less common for individual taxi drivers but can affect fleet operators using aggressive tax-planning structures.
COP9: the most serious type. HMRC suspects deliberate tax fraud. Under COP9, HMRC offers the Contractual Disclosure Facility in exchange for not pursuing criminal prosecution.
What Triggers an HMRC Investigation?
Income inconsistencies, data-matching across multiple sources, informants, filing history gaps, large or regular cash deposits that do not match declared income, and random selection are all common triggers.
For self-employed taxi drivers, the most common triggers are the mismatch between licensing data and declared income, and the visibility of platform earnings HMRC can access directly.
Your Rights During an HMRC Investigation
You have the right to professional representation, to know what is being investigated, to reasonable deadlines, to appeal penalties, and to confidentiality. HMRC cannot share information about your investigation with your employer, council, or anyone else without legal authority.
What NOT to Do If HMRC Investigates You
Do not ignore HMRC letters or calls. Do not destroy records. This is a criminal offence. Do not call HMRC to explain yourself without advice. Do not provide more than asked for. Do not panic. The vast majority of investigations end with a negotiated settlement.
When to Get Professional Help
The honest answer: immediately. The earlier you engage a specialist, the better the outcome. TaxiLaw International provides dedicated HMRC investigation support for taxi drivers and fleet operators.