Receiving an HMRC enquiry does not automatically mean you have done anything wrong. It’s a formal review process, not an accusation. Not every enquiry results in any changes whatsoever, and the companies that weather them most comfortably are those that approach them calmly, promptly, and with the appropriate level of professional assistance, not those that panic or simply ignore the letter.
Few letters generate as much anxiety as one from HMRC. The reaction is usually immediate.
“What have I done wrong?”
“Am I being investigated?”
“Is this going to cost me money?”
“Should I reply straight away?”
After more than 25 years advising business owners and dealing with HMRC enquiries, I can reassure you that the first question is often based on a misunderstanding. An HMRC enquiry does not automatically mean you have done anything wrong.
In this guide, we will cover what constitutes an HMRC enquiry. Why does HMRC open them? What are the types of HMRC enquiries, and how long do they last? Can they result in penalties or prosecution? The most common mistakes when handling them.
What Is an HMRC Enquiry?
An HMRC enquiry is a formal review of a tax return, tax position or specific transaction. HMRC has statutory powers to check tax returns, verify information, request supporting records, and ask questions about figures submitted.
The purpose is to establish whether the correct amount of tax has been paid nothing more. Sometimes HMRC is checking something specific. Sometimes the review is broader. Sometimes a return has simply been selected as part of a wider compliance programme. Receiving an enquiry does not mean HMRC has already reached a conclusion; in most cases, they are gathering information before reaching a view.
Why Has HMRC Contacted Me?
There are many possible reasons, and not all of them relate to something unusual in your figures. Common triggers include:
- Large changes in profits
- Unusual expense claims
- Property transactions
- Capital gains
- Research and development claims
- VAT discrepancies
- Information received from third parties
- Industry-specific compliance projects
In some cases, there will even be no trigger point at all. The HMRC conducts random compliance audits along with risk-based reviews in many different industries; hence, an organisation which is completely ready for this type of review might still receive it.
The activity of the HMRC itself has also risen, as the compliance efforts of the agency have raised £24.2 billion in revenues during only nine months in 2025-26, compared to a target of £50.4 billion annually. The increased focus is on large corporations, but the HMRC’s capacity to gather information has improved.
Different Types of HMRC Enquiry
Not all enquiries are the same, and understanding which type you are dealing with matters for how you should respond.
Full Enquiry
A full enquiry examines an entire tax return. HMRC may review:
- Income
- Expenses
- Capital transactions
- Supporting records
These enquiries can become detailed and may run for several months.
Aspect Enquiry
An aspect enquiry focuses on a particular issue, for example:
- A capital gain
- A property disposal
- A director’s loan account
- A specific expense category
These are generally narrower in scope.
VAT Enquiries
VAT enquiries focus on VAT returns and compliance HMRC may review:
- Sales records
- Purchase records
- VAT coding
- Supporting documentation
Employer Compliance Reviews
These focus on PAYE matters, including:
- Payroll
- Benefits in kind
- Expenses
- Employment status
Information Notices
Sometimes HMRC doesn’t formally open an enquiry but instead requests information under its statutory powers. The distinction matters; see the formal definitions.
What Might HMRC Ask For?
The response will depend on the type of query, but the following may be among the requests: bank statements, accounts, sales and purchases invoices, Common requests include:
- Bank statements.
- Accounting records.
- Sales invoices.
- Purchase invoices.
- VAT records.
- Payroll records.
- Contracts.
- Loan agreements.
- Property documentation.
- Explanations for specific transactions.
Many business owners become concerned when the list appears extensive. It is usual for some businessmen to worry when the list seems to be a long one. However, the size of the request list does not mean that all the documents contained therein will be necessary to be supplied.
How Long Does an HMRC Enquiry Take?
There is no fixed timeline, and this is one of the most common questions we are asked. Duration depends almost entirely on the type of enquiry and how quickly information is exchanged.
- Aspect enquiries: often resolved within a few weeks to a few months, particularly where records are clear, and the point at issue is narrow.
- Full enquiries: typically run for several months and can extend longer when multiple tax years or complex transactions are involved.
- Large corporate investigations: can persist for years. The large UK business directorate of HMRC is dealing with almost 2,000 of the largest business groupings in the country, with around half of them being investigated at any point in time because of the heavy resource consumption of such investigations, as penalties have been issued in 636 cases in the fiscal year 2024-25, which is a dramatic increase from the 164 issued in 2021-22.
- Inheritance tax enquiries: these are increasing rapidly. HMRC has carried out 4,940 IHT inquiries in 2025/26, marking an increase of 18% when compared to last year, and marking the highest number of inquiries in six years, according to figures presented by accountancy firm Price Bailey. But 40% of all compliance inquiries that were referred during this period have shown change, while the rest have remained unchanged.
The single biggest factor within your control is the quality and speed of your response. Enquiries where records are organised, complete and provided promptly tend to close significantly faster than enquiries where HMRC has to chase repeatedly for missing information. Poor bookkeeping is one of the most common reasons an otherwise straightforward enquiry drags on for months longer than it should.
Common Mistakes Taxpayers Make
Patterns tend to emerge after responding to enquiries for a long period of time.
Mistake 1: Panicking
Receiving an HMRC letter can cause people to panic. However, panic does not usually help, as most enquiries are resolved by collecting information.
Mistake 2: Ignoring the Letter
Deadlines exist by failing to respond to the letter, one could make the situation even worse. Acknowledgement is recommended, regardless of whether you have enough time to seek some advice.
Mistake 3: Sending Everything Immediately
Taxpayers tend to send lots of documents without even considering their relevance. A well-thought-out response works much better than just sending a bunch of documents.
Mistake 4: Trying to Handle Technical Issues Alone
Some enquiries require nothing more than collecting records. Other enquiries might involve very complex technical questions that are hard to see at first glance.
Mistake 5: Taking It Personally
Compliance officers do their job; a professional approach yields better results.
What Happens During an HMRC Enquiry?
Every enquiry differs, but most follow a similar pattern.
Stage 1: Opening correspondence
Stage 1: Opening correspondenceHMRC explains what they’re reviewing, why, and what information is required.
Stage 2: Information gathering
Usually, the longest stage is during which documents are exchanged, questions are raised, and explanations are provided.
Stage 3: Review and discussion
HMRC analyses the material, which may lead to further questions or technical discussion. Meetings are sometimes arranged.
Stage 4: Conclusions
HMRC reaches a view: no adjustment, agreed adjustments, disputed adjustments, or formal closure. Many enquiries conclude with far more modest adjustments than the business owner initially feared.
Could an HMRC Enquiry Lead to Penalties or Prosecution?
It can, but it’s far from automatic, and most enquiries never get close to either outcome.
Penalties are the more realistic risk, scaled according to behaviour: innocent errors, carelessness, and deliberate non-compliance attract different treatment, with interest on unpaid tax on top. As of January 2026, HMRC’s late payment interest rate is 7.75%, roughly triple the 2022 rate, making prompt resolution worthwhile even where no penalty applies. Voluntary disclosure before HMRC raises the issue, rather than after, typically results in a much more favorable outcome.
Cases of prosecution are rare and only apply to proven fraud. The HMRC does not prosecute and refers such matters to the Crown Prosecution Service, which prosecutes only if there is sufficient evidence and deterrence. Statistics for recent years indicate that there has been a decline in prosecutions and convictions by 9% and 7%, respectively, an indication of a trend toward fewer and more valuable cases. In such cases that reach court, the probability of conviction is high at 91%, with more than half resulting in imprisonment.
Real-World Examples
A random enquiry
A local service company submits accurate returns year after year. An enquiry is opened, and the director assumes something must be wrong. In reality, the return was selected as part of a compliance review programme. Records are provided, questions are answered, and the enquiry closes with no adjustments, but is ultimately uneventful.
A record-keeping issue
A growing business has weak bookkeeping systems. The underlying tax position is broadly correct, but supporting records are inconsistent, so the enquiry drags on while time is spent reconstructing information. The lesson isn’t really about tax; it’s about record keeping. Good records often shorten enquiries dramatically.
A technical disagreement
A business undertakes a transaction with a genuine technical interpretation issue. The facts aren’t disputed; the law is. These enquiries usually involve professional representation and reasoned discussion; they’re about differing views of legislation, not wrongdoing.
When Professional Support Becomes Advisable
Not every HMRC letter requires specialist representation. But the value of the professional increases when there are considerable liability issues, complicated business dealings, more than one tax year involved, a difficult issue from a technical perspective, information notices, a VAT enquiry, an employer compliance check, or missing information.
Good representation can facilitate communication, accuracy, focus of the inquiry, reduction of stress, and avoidance of misunderstandings. It is important to be realistic in what one can expect; no adviser can ensure a certain outcome. But what good representation can accomplish is efficiency in the process, improved communication, and better decision-making.
Early Handling Matters
One of the most persistent facts derived from the enquiry process is the following: the method with which the enquiry begins tends to determine the course of the entire process. When things are dealt with early on, documentation is easier to get, mistakes are fewer, deadlines are met, and choices are possible. It is doubtful that anything positive will be achieved through delay.
The Bigger Picture
The majority of entrepreneurs take many years to build their businesses, and an HMRC investigation might appear as an obstacle to that process. However, an HMRC investigation is nothing more than an inquiry that may at times be inconvenient and at other times frustrating, but it always remains an investigation. The purpose is to conduct the investigation effectively by providing relevant facts and reaching a logical conclusion.
Conclusion
If you have heard from HMRC, it may be helpful to consider your situation before responding to their message. A simple conversation may shed light on what they are asking for and whether any assistance is needed.
Carter Collins & Myer frequently advises businesses across Rochdale, Oldham, Bury and the surrounding areas, company directors and individuals in respect of queries, demands for information and technical discussions with HMRC. In some situations, it is enough to provide the information HMRC requires. At other times, things are more complicated. But it helps to understand where you stand before replying.