Is an HMRC compliance check the same as an investigation?

In everyday conversation, people use "compliance check" and "investigation" to mean the same thing, and that's not unreasonable, because both describe HMRC looking into your tax affairs. But HMRC's own literature reserves the word "investigation" more for the serious end of the spectrum, particularly cases run under Code of Practice 8 or Code of Practice 9.

A routine compliance check, such as a query about one expense claim, is not the same scale of matter as a Code of Practice 9 case, where HMRC suspects deliberate fraud and the taxpayer may need to make a formal disclosure to avoid criminal prosecution. Both fall under the broad HMRC compliance umbrella, but the stakes and process differ enormously.

The practical point is not to panic simply because you've heard the word "investigation" attached to your situation. Check exactly what type of letter you have and whether it references a specific Code of Practice.

The letter itself is the best guide. A standard compliance check letter will usually reference a specific return, year, and a request for information, often under Schedule 36 Finance Act 2008. It will typically not use words like "fraud" or reference a Code of Practice number.

If your letter specifically mentions Code of Practice 8, HMRC suspects a significant tax loss that goes beyond a simple error, often involving tax avoidance arrangements or complex structuring, but without necessarily alleging fraud. If it mentions Code of Practice 9, HMRC suspects deliberate, serious fraud and is offering the Contractual Disclosure Facility as a route to resolve matters without criminal investigation.

If you're not sure which category your letter falls into, that uncertainty itself is a good reason to get professional advice quickly, since the right response differs significantly between a routine check and a Code of Practice 9 case.

Getting the categorisation right changes how you should respond. A routine compliance check usually just needs accurate, timely information. A Code of Practice 8 case often benefits from a considered strategy around how disclosures are made and negotiated. A Code of Practice 9 case has a formal process with strict deadlines, and getting professional advice immediately is essential given the criminal law dimension.

Confusing the two in either direction causes problems: treating a routine check as a criminal matter can cause unnecessary anxiety and cost, while treating a genuinely serious case too casually can make things significantly worse.

Most directors who receive HMRC correspondence are dealing with a standard compliance check relating to Corporation Tax, VAT, or their own Self Assessment return. These are manageable with good record-keeping and, where needed, professional support.

If you're ever unsure whether your letter is a routine check or something more serious, don't guess. Read the letter for any Code of Practice reference and, if in doubt, get it reviewed by an accountant before responding.

Misjudging the seriousness of a letter, in either direction, tends to increase costs: either unnecessary anxiety and rushed decisions, or under-preparation for a genuinely serious case.

Growth plan clients receive tax investigation insurance as standard, covering professional costs whether the matter turns out to be a routine check or something more significant. See /fees for plan details.

Don't assume every HMRC letter is a serious investigation; check the actual wording and any Code of Practice reference.

Don't dismiss a letter that does reference Code of Practice 8 or 9 as routine; get advice immediately.

Don't rely on secondhand descriptions of what type of case you're in; read the letter itself carefully.