HMRC Compliance Checks
The letter usually starts with “Compliance check into your return for the year ended…” and a list of documents required within 30 days. For most recipients, it is the first direct contact with HMRC’s Compliance team. For you as the director, it is a defined procedure under specific statutory rules, not an open-ended interrogation.
Knowing which rules apply, and using them, is the difference between a tidy closure and an expensive penalty assessment. We see directors make unnecessary concessions because they do not know where HMRC’s powers stop.
This page sets out what a UK HMRC compliance check is, the common triggers, the rights and responsibilities of directors during the process, the typical timeline, and the outcomes that follow, settlement, assessment, penalties, or escalation to a more serious enquiry.
What HMRC Compliance Checks Are and How They Work
An HMRC compliance check is a formal review of a taxpayer’s records and returns, conducted under Schedule 36 of the Finance Act 2008. It is the most common form of HMRC enquiry, routine, civil, and almost always conducted under Code of Practice 1 (COP1).
The scope of a check can include:
- Corporation Tax, the CT600 return and underlying accounts.
- VAT, quarterly returns, records, and specific transactions.
- PAYE, payroll records, P11D submissions, IR35 position on contractors.
- Specific transactions, where a single transaction is queried (property sale, R&D claim, share scheme).
- Cross-tax aspects, where issues in one tax raise questions about another.
A compliance check can be “aspect” (narrow focus on one or two issues) or “full” (comprehensive review of all returns for a year). Most checks are aspect-based; full checks are reserved for higher-risk cases or follow-on from aspect findings.
Common Triggers for an HMRC Compliance Check
HMRC selects compliance-check targets using a mix of risk-based intelligence and random sampling. The main triggers:
- Risk analytics on filed returns, sharp year-on-year changes, ratios inconsistent with sector benchmarks, unusual expense patterns.
- Specific claims, R&D tax credits, capital allowances on large expenditure, loss carrybacks, group relief elections.
- Third-party data reconciliation, VAT returns that do not reconcile with customer VAT returns; payroll data that does not match RTI submissions.
- Industry-wide campaigns, HMRC periodically targets specific sectors or arrangement types (offshore, let property, crypto assets, specific trades).
- Random selection, a small proportion of cases are selected without risk basis, for baseline compliance measurement.
- Third-party reporting, bank information under the Common Reporting Standard, whistleblower disclosures, intelligence from former employees or business partners.
Understanding the likely trigger informs your response. A check focused on a specific R&D claim needs different preparation from a check triggered by VAT reconciliation discrepancies. In our experience, knowing what HMRC is looking for before you respond saves significant time and penalty exposure.
Your Rights and Responsibilities During an HMRC Compliance Check
HMRC’s powers under Schedule 36 of the Finance Act 2008 are broad but not unlimited. The taxpayer’s rights:
- Right to representation by a qualified tax adviser or solicitor. HMRC will correspond directly with the agent, which keeps the director out of drafting replies at 11pm the night before a deadline and typically narrows the questions before a formal notice is issued.
- Right to written reasons for any formal information notice. HMRC must specify what is required and why.
- Right to appeal formal assessments to the First-tier Tribunal (Tax Chamber) within 30 days.
- Right to statutory review, an internal HMRC review by an officer not involved in the original decision, requested within 30 days.
- Right to privilege, legal professional privilege over solicitor communications; limited privilege over tax adviser advice.
- Right to decline voluntary meetings. Meetings are not compelled under COP1, though formal Schedule 36 notices can require specific document production.
Responsibilities:
- Produce documents specified in formal Schedule 36 notices, within the stated deadline. Non-compliance triggers penalties of £300 plus £60 per day.
- Answer specific questions that relate to the compliance check’s scope, in writing. Broad fishing questions can be declined; narrow questions should be answered accurately.
- Not destroy relevant records. Destruction is a separate offence and supports increased penalty categories.
- Co-operate in good faith. Co-operation scores contribute to penalty reductions under the Schedule 24 behaviour framework.
What to Expect During an HMRC Compliance Check
A typical check runs through the following stages:
- Opening notice, HMRC letter specifying the scope, tax year, and information requested. Typically 30 days to produce initial documents.
- Information exchange, HMRC may issue formal Schedule 36 notices for specific documents, or follow-up questions based on initial production.
- Meetings (optional under COP1), HMRC may request meetings with directors or accountants. Meetings are voluntary unless a formal notice is issued.
- Draft findings, HMRC sets out its provisional position, including any proposed adjustments, behaviour category, and penalty.
- Negotiation, the taxpayer can contest the proposed adjustments, behaviour category, or penalty calculation.
- Closure, HMRC issues a closure notice under section 28A of the Taxes Management Act 1970 (or section 32 for VAT), setting the final position. The 30-day appeal window begins.
Typical duration: 3–6 months for a simple aspect check; 12–18 months for a full check covering multiple years. Complex cases involving R&D or international aspects can run longer.
Preparing for an HMRC Compliance Check
Where a compliance-check letter has been received, your first week determines the rest of the outcome.
- Instruct an accountant or tax adviser with compliance-check experience. HMRC correspondence through a regulated professional is consistently cleaner than direct director response.
- Identify the scope precisely. Which tax, which year, which aspects? A check on VAT for a single quarter is a different animal from a full corporation tax enquiry.
- Review your underlying position honestly. If errors are present in your returns under check, unprompted disclosure before HMRC identifies them produces the biggest Schedule 24 penalty reduction.
- Prepare documents systematically. Bank statements, invoices, contracts, payroll records, organised by scope rather than chronology. HMRC’s information notice will specify what is required; producing a tidy, indexed response saves days of follow-up.
- Document your own position. Notes of key decisions, supporting third-party documents, and contemporaneous evidence of reasonable care are the materials that defeat “careless” allegations.
Potential Outcomes and Next Steps After an HMRC Compliance Check
Four main outcomes:
- No adjustment required. The check closes with no changes to the return. This is the outcome in a meaningful minority of cases where the underlying position was correct.
- Adjustment with no penalty. An error is identified but classified as “reasonable care”, no penalty under Schedule 24. Tax and interest apply.
- Adjustment with behaviour-based penalty. The error is classified as careless, deliberate, or deliberate-and-concealed, with penalty in the relevant Schedule 24 band. See HMRC Penalties & Investigations for the full framework.
- Escalation to more serious enquiry. Where the compliance check uncovers patterns suggesting fraud or systematic concealment, HMRC may escalate to Code of Practice 9 or to criminal investigation. The transition is formal and the procedural rules change.
Where a settlement cannot be paid, Time to Pay arrangements are usually available for first-time cases with credible future compliance. Where the settlement threatens business viability, licensed insolvency advice becomes relevant.
When an HMRC Compliance Check Intersects with Business Distress
Compliance checks and business distress often arrive together, for predictable reasons. The conditions that cause compliance errors, stretched bookkeeping, cash-flow pressure, director overload, are the same conditions that precede cash-flow insolvency.
If your compliance check arrives at a moment when the business is already stretched, that overlap deserves separate attention from a licensed IP. In our experience, directors who treat the two problems as one tend to make concessions during the check that worsen their insolvency position.
Signals to watch during a check:
- Accumulating HMRC arrears while the check is ongoing, compounds the eventual settlement and signals underlying insolvency.
- Director’s loan account issues surfacing in the check, section 455 exposure at 33.75% of outstanding balances adds to the bill.
- Parallel HMRC collection action on other debts, see HMRC Enforcement Action.
- Escalation signals, meeting requests moving from voluntary to formal Schedule 36 notices; questions broadening beyond the original scope.
Where the eventual settlement will threaten your business viability, licensed insolvency practitioner involvement should start well before closure, to model formal-process alternatives and protect your personal position alongside the tax settlement. We assess that exposure at the outset, so nothing is left unexamined when the check closes.
Your Next Step on an HMRC Compliance Check
The first call on any compliance-check letter is to a qualified accountant or tax adviser with check experience. Handling a check without representation is possible but rarely optimal; the cost of representation is typically a fraction of the penalty mitigation it produces. Your risk of paying unnecessary penalties rises sharply when you respond to HMRC directly without specialist support.
Our licensed IPs and business rescue specialists can assess the cash-flow impact of the settlement, model formal-process alternatives where the business cannot absorb the bill, and handle the HMRC Debt Management conversation alongside the tax professional running the check.
The honest caveat: if the closure notice lands and you have already paid dividends or preferred other creditors during the check, our options narrow fast. The time to get a second opinion is while the check is still open, not the week the settlement arrives. Call us free on 0800 074 6757 for confidential advice.
HMRC Compliance Check FAQs
How long does an HMRC compliance check take?
A simple aspect check on a single issue typically closes in 3–6 months. A full check covering multiple tax years or complex positions runs 12–18 months. R&D, international, and cross-border aspects routinely extend the timeline further. The recipient has limited control over duration; prompt and complete responses to information notices are the main lever.
Do I have to attend meetings with HMRC?
Under COP1, meetings are voluntary. The taxpayer can choose to respond entirely in writing through their adviser. Formal Schedule 36 notices can compel production of specific documents but do not compel attendance at meetings for most purposes. For serious enquiries under COP8 or COP9, the position changes.
Can HMRC extend the scope of a compliance check?
Yes, where information produced during the check raises questions about adjacent years or other tax types. A check that starts on a single CT600 can extend to prior years within the statutory enquiry window (4 years for careless, 6 years for deliberate, 20 years for deliberate concealment). Scope extension should be formally notified.
Can I refuse to produce documents HMRC has asked for?
Where the request is informal, yes. Though refusal without basis often triggers a formal Schedule 36 notice that must be complied with or appealed. Formal Schedule 36 notices can be appealed within 30 days on grounds including irrelevance or disproportionate scope. Non-compliance with a valid Schedule 36 notice triggers penalties of £300 plus £60 per day.
What happens if an error is found during the check?
HMRC issues an assessment for the additional tax, interest from the original due date, and a penalty under Schedule 24 of the Finance Act 2007 based on the behaviour category (careless, deliberate, or deliberate-and-concealed).
The penalty percentage can be reduced by the quality of your disclosure (unprompted vs prompted, telling/helping/giving scores). Unprompted disclosure before HMRC identifies the issue produces the largest reduction.
Can a compliance check become a fraud investigation?
Yes, where patterns suggesting deliberate concealment surface during the check. HMRC formally escalates by moving to COP8 (serious, non-fraud) or COP9 (fraud suspected, CDF offered). The procedural rules change sharply at that point; specialist representation becomes essential if it was not already instructed.
Methodology & Disclosure
This guide is written by our editorial team, reviewed by our licensed insolvency practitioners and tax specialists, and reflects UK compliance-check law and HMRC practice as at the last-reviewed date. Statutory references are drawn from the Finance Act 2008 (Schedule 36), Finance Act 2007 (Schedule 24), Taxes Management Act 1970, and VAT Act 1994.
Company Debt is an insolvency advisory firm. Compliance-check representation itself is handled by qualified tax advisers or solicitors. Where the eventual settlement threatens your business viability, we can act as the licensed Insolvency Practitioner for a CVA, Administration, or CVL under separate engagement. Our 0800 number is a free confidential consultation.
