What does a compliance check letter from HMRC mean?

"Compliance check" is HMRC's umbrella term for any review it carries out to check whether tax has been correctly reported and paid. It covers everything from a short letter asking you to confirm one figure, to a formal enquiry into a whole Self Assessment or Corporation Tax return. The letter itself will usually say what's prompted the check and what HMRC wants to see.

These checks apply across most taxes: Income Tax, Corporation Tax, VAT, PAYE and Capital Gains Tax can all be subject to one. The common thread is that HMRC has identified something it wants to verify, whether that's because of a data mismatch, a claim that stands out, or simply as part of its routine risk-based checking.

Receiving a compliance check letter is not the same as HMRC accusing you of dishonesty. Many checks are resolved with no change at all once the figures are confirmed.

HMRC uses a mix of risk-based selection and random checks. Risk indicators might include a large or unusual expense claim, income figures that don't match third-party data such as bank interest reports, or a pattern that's common in a particular trade sector.

Some checks are opened simply because HMRC receives information from elsewhere, such as land registry data on a property sale, or information from another country under international exchange agreements. Others are entirely random, intended to keep the overall system honest.

Whatever the trigger, the letter you receive should set out clearly what aspect of your affairs is being looked at, even if it doesn't explain exactly why you were selected.

In practice, people use "compliance check" and "enquiry" almost interchangeably, and HMRC's own literature does the same. A formal enquiry into a Self Assessment or Corporation Tax return is a type of compliance check, opened within a specific time limit and following a defined legal process.

Other compliance checks are less formal and don't require HMRC to "open an enquiry" in the strict legal sense; they might simply be a request for information under Schedule 36 Finance Act 2008 to check one aspect of a claim, such as a VAT repayment.

The distinction matters mainly for time limits and appeal rights, which is why it's worth checking exactly what kind of check you're facing rather than assuming all HMRC letters carry the same weight.

For a director, a compliance check letter often relates to Corporation Tax, VAT, or the Self Assessment return that reports dividends and salary from the company. Because company and personal tax interact closely, a check that starts on one return can sometimes extend into the other if HMRC finds something that needs following up.

Treat the letter as a prompt to get your records in order and respond clearly, rather than as evidence of a problem. Most checks close once HMRC has seen enough to confirm the figures are right.

The cost of a compliance check is mostly your time and, if the matter is complex, professional fees for advice. A check that's handled promptly and with clear evidence rarely leads to significant additional cost.

Growth plan clients get tax investigation insurance included as standard, covering professional costs if a check develops into a fuller enquiry. See /fees for details.

Don't assume a compliance check means you're being investigated for fraud; the vast majority are routine.

Don't leave the letter unanswered because you're unsure what it means; ask HMRC or an adviser to clarify the scope.

Don't provide speculative answers about figures you're not sure of; say you'll confirm and follow up with accurate information.