HMRC VAT Compliance Check: What The Letter Means

An HMRC VAT compliance check is a targeted review of whether the VAT you have declared, reclaimed or charged is correct. HMRC opens these checks using powers connected to the VAT Act 1994 and its information powers under Schedule 36 Finance Act 2008. The letter will usually name the periods under review and the specific point of concern, such as input tax recovery, zero-rating or a large repayment claim.

This is different from the general VAT dispute support covered elsewhere on this site. Here the focus is the compliance-check letter itself: what it asks for, how a visit works, and what happens if HMRC assesses extra tax. Read the letter as a scoped request, not a general audit, and respond to what is actually asked.

HMRC rarely gives a detailed reason for selecting a return. Triggers commonly include a repayment return that looks unusual against your trading pattern, a mismatch between VAT returns and figures reported elsewhere, third-party data, a sector risk, or simple random selection.

Being selected does not mean HMRC believes the return is wrong. It means the return has scored as worth checking. Treat the letter calmly, but do not assume the check will be superficial if the underlying records are weak.

Under Schedule 36 Finance Act 2008, HMRC can require a business to produce information or documents reasonably required to check its tax position, including VAT records, invoices, contracts and, where relevant, business bank statements. The request must relate to the tax position being checked; it is not an unlimited power to demand every document a business holds.

Bank statements are commonly requested where sales, cash handling or the source of funds behind a repayment claim need verifying. You can query a request that seems disproportionate, and in some cases you can appeal against a formal information notice. An informal request is different from a formal Schedule 36 notice, so check which one you have received before deciding whether to challenge it.

If you believe a notice asks for something not reasonably required, put the objection in writing promptly rather than simply not responding. Missing the appeal window on a formal notice removes that option.

There is no fixed HMRC deadline for closing a VAT compliance check. A narrow question about one invoice or transaction type can be resolved in a matter of weeks if records are clear. A check spanning several VAT periods, or one that leads to a visit, can run for many months.

The check ends in one of a few ways: HMRC closes it with no change, HMRC and the business agree an adjustment, or HMRC issues a formal assessment where agreement cannot be reached. Keep the closing letter with your VAT records, since it may be needed if the same point is queried again in future.

Where HMRC concludes that VAT has been understated or over-claimed, it can raise an assessment for the shortfall together with interest for late payment. A separate penalty may also apply, but it is not automatic; the amount depends on the behaviour that caused the error.

HMRC's penalty regime distinguishes between careless and deliberate behaviour, and between disclosures that are prompted (after HMRC has raised the issue) and unprompted (volunteered first). A careless, unprompted error attracts a lower penalty range than deliberate concealment discovered by HMRC. Cooperating fully, correcting errors early and explaining what went wrong can reduce the penalty within the applicable range, even though it cannot guarantee a specific outcome.

If you disagree with an assessment or penalty, HMRC's decision letter should explain the review and appeal options, typically within 30 days. You can ask for an internal HMRC review or appeal directly to the First-tier Tribunal (Tax Chamber); do not let informal discussion with HMRC cause you to miss that deadline.

The most common mistakes are missing the reply deadline, sending records without checking them first, and answering questions HMRC did not ask while ignoring the ones it did. Volunteering a broad narrative before reconciling figures can create inconsistencies that are hard to unpick later.

Another frequent error is treating a visit request as optional or informal. If HMRC proposes to visit your premises, confirm the purpose, who will attend and what will be reviewed, and prepare records in advance rather than improvising on the day.

A small manufacturing business submitted a VAT return showing a repayment larger than its usual quarterly pattern, driven by a one-off purchase of machinery. HMRC opened a compliance check asking for the purchase invoice, evidence of payment and confirmation the asset was used for business purposes.

The business located the invoice, matched it to the bank payment and confirmed the asset's use in a short covering letter, without sending unrelated records. HMRC raised one follow-up question about the supplier's VAT registration, which was answered within the reply window. The check closed with no adjustment once HMRC was satisfied the input tax claim was correctly evidenced.

The outcome reflects a well-organised, scoped response rather than any special treatment. Where records exist and match the return, a compliance check can close quickly.