1. I've received a letter from HMRC about a compliance check, what do I do?
Do not ignore it. Read the letter carefully to identify which tax and years it covers, note the reply deadline, and gather the records it mentions. Contact a tax adviser or accountant promptly, especially if you are unrepresented, before responding to HMRC. Early, organised engagement reduces the risk of penalties and keeps the enquiry proportionate.
Read the full answer2. What does a compliance check letter from HMRC mean?
A compliance check is HMRC's general term for reviewing whether you have paid the right tax. It can cover Self Assessment, VAT, PAYE or Corporation Tax, and ranges from a simple query to a full enquiry. It does not automatically mean wrongdoing; HMRC checks many returns routinely as well as targeting risk indicators.
Read the full answer3. Is an HMRC compliance check the same as an investigation?
They overlap but are not identical terms. "Compliance check" is HMRC's umbrella phrase covering informal queries through to formal enquiries opened under s9A TMA 1970. A formal enquiry carries statutory information powers and a closure notice process; a lighter compliance check may resolve with a simple explanation and no formal enquiry ever being opened.
Read the full answer4. How do I know if an HMRC letter is genuine?
Check the letterhead, reference number and named officer against GOV.UK's guidance on genuine HMRC contact. Genuine letters never ask you to pay by gift card, urgent bank transfer, or click an embedded payment link. If unsure, phone HMRC's official helpline number from GOV.UK directly, rather than any number printed on the letter itself.
Read the full answer5. What is a Code of Practice 8 letter?
A Code of Practice 8 letter opens a civil investigation into suspected serious tax avoidance or complex arrangements where HMRC does not yet suspect fraud. It sits below Code of Practice 9 in severity but is still serious, involves specialist officers, and usually justifies instructing an experienced tax investigation adviser immediately upon receipt.
Read the full answer6. What is a Schedule 36 information notice?
A Schedule 36 information notice is a formal statutory demand under Schedule 36 FA 2008 requiring you to provide specified documents or information HMRC reasonably needs to check your tax position. Failure to comply on time can trigger daily penalties, and in some cases you can appeal the notice to the tribunal.
Read the full answer7. What does “check of your Self Assessment tax return” mean?
It means HMRC has selected your Self Assessment return, or a specific entry on it, for review before accepting the figures as final. This can be a full enquiry into the whole return or a narrower "aspect" enquiry focused on one item, such as expenses, income sources, or a claimed relief.
Read the full answer8. How long do I have to reply to an HMRC enquiry letter?
There is no single fixed deadline for every letter, but any stated response date should be treated seriously. Formal information notices under Schedule 36 FA 2008 commonly allow a set minimum period, often around 30 days, to produce documents. Missing it risks penalties, so respond or request an extension before that date passes.
Read the full answer9. Can I ask HMRC for more time to respond?
Yes, you can ask HMRC for more time, and reasonable requests are often granted, particularly where you are gathering records or instructing an adviser. Contact the officer named on the letter before the deadline expires, explain why more time is needed, and get any extension confirmed in writing to avoid later dispute.
Read the full answer10. What happens if I ignore an HMRC compliance check letter?
Ignoring it rarely makes an enquiry go away and usually makes things worse. HMRC can issue formal Schedule 36 FA 2008 notices, raise penalties for non-compliance, and ultimately make a discovery or best-judgement assessment based on limited information, which is often higher than the true liability would have been with full cooperation.
Read the full answer11. Do I have to reply to an HMRC nudge letter?
You are not legally compelled to reply to a nudge letter itself, since it is not a formal information notice. However, ignoring credible evidence that HMRC holds data about undeclared income is risky, because it can later be treated as prompted rather than unprompted disclosure, increasing any penalty if HMRC investigates further.
Read the full answer12. Why has HMRC opened an enquiry into my tax return?
HMRC opens enquiries under s9A TMA 1970 for many reasons: figures that look inconsistent with data it already holds, a pattern that fits a known risk profile, a random selection, or a specific tip-off. The opening letter does not have to explain the exact trigger, only that an enquiry is being made.
Read the full answer13. Is my HMRC enquiry random or targeted?
It could be either, and HMRC is not required to tell you which. Some enquiries are opened through risk-based data matching against third-party information, such as bank interest, property sales or online marketplace data. Others form part of a small random sample used to test overall compliance levels across taxpayers generally.
Read the full answer14. How does HMRC select people for a tax investigation, and what triggers one?
HMRC uses risk-based software (Connect) that cross-matches your return against data from banks, land registries, online marketplaces, and other government sources, alongside a small element of random selection. Common triggers include income inconsistent with lifestyle, repeated losses, large or unusual expense claims, late filing patterns, and tip-offs or industry-specific campaigns.
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