How Likely Is an HMRC Enquiry — and What Would It Mean for Your Business?
Nobody wants to receive a letter from HMRC saying they are opening an enquiry or compliance check. For many business owners, the first reaction is worry: Have we done something wrong? How serious is this? What will HMRC ask for? How much could it cost?
The reality is that an HMRC enquiry does not automatically mean you have done anything wrong. HMRC carries out compliance checks to make sure the right amount of tax is being paid, the right allowances and reliefs are being claimed, and records support the figures submitted. HMRC guidance says a check can cover taxes you pay, accounts and tax calculations, Self Assessment returns, Company Tax Returns, PAYE records and returns. If you have an accountant, HMRC will normally contact them instead.
How likely is an HMRC enquiry?
There is no simple percentage that applies to every business. The likelihood depends on the type of business, the taxes involved, the figures submitted, the quality of records, the claims made and whether HMRC identifies a risk.
HMRC’s own Compliance Handbook says a compliance check should not be started unless there is a risk to address, or the case has been selected as part of the random enquiry programme.
That means enquiries can arise in two broad ways.
The first is risk-based. HMRC may see something in the return, accounts, VAT submissions, PAYE records or wider information that does not look consistent. That does not always mean the figures are wrong, but it may mean HMRC wants an explanation.
The second is random selection. Even a well-run business with accurate records can be selected. This is one reason why good bookkeeping and supporting evidence matter, even when you are confident everything has been done correctly.
What might trigger HMRC interest?
HMRC does not publish a full checklist of triggers, but common areas that can increase scrutiny include unusual movements in profit, VAT repayment claims, large expense claims, director loan account issues, PAYE or CIS inconsistencies, subcontractor costs, poor record-keeping, late filings, undeclared income, or claims for reliefs that need strong evidence.
For limited companies, HMRC may look at the Company Tax Return, corporation tax computation, accounts, VAT returns, payroll records, dividends, benefits, expenses and transactions between the company and directors.
For owner-managed businesses, the line between business and personal costs can also attract attention. Items such as travel, entertaining, home working costs, vehicles, repairs, mobile phones, subsistence and director reimbursements should all be properly recorded and supported.
What happens during an HMRC compliance check?
HMRC will usually write or phone to explain what they want to check. Their factsheet says they may ask for information or documents to help with the check, and some checks may be carried out over the phone. If HMRC phones, you can ask them to write instead. (GOV.UK)
In practice, HMRC may ask for records such as:
accounting records;
bank statements;
invoices;
receipts;
payroll records;
VAT workings;
CIS records;
director loan account details;
explanations of specific transactions;
contracts or supporting documents.
The key is not to panic, but also not to ignore it. Deadlines matter, and replies need to be accurate, complete and carefully considered.
The implications of an HMRC enquiry
The implications depend on what HMRC finds.
If the records support the returns, the enquiry may close with no adjustment. That is obviously the best outcome, although it can still take time and cause stress.
If HMRC finds errors, the business may need to pay additional tax. There may also be interest and, depending on the circumstances, penalties. HMRC’s compliance check guidance explains that checks are used to make sure the taxpayer is paying the right amount of tax at the right time and receiving the correct allowances and reliefs.
The financial cost can therefore include:
extra tax;
interest;
penalties;
professional fees;
time spent gathering records and answering questions;
disruption to the business.
There can also be a wider cost. An enquiry can distract directors, delay other work, create anxiety and expose weaknesses in bookkeeping systems.
Why good records are your best defence
Good records do not guarantee HMRC will never ask questions, but they make a huge difference if they do.
If every figure in the accounts can be traced back to proper evidence, the business is in a much stronger position. If records are incomplete, inconsistent or difficult to explain, the enquiry becomes harder to manage.
Strong bookkeeping, cloud accounting, receipt capture, regular reconciliations and management accounts all help create a clear audit trail.
A business should not wait until HMRC opens an enquiry to find out whether its records are good enough.
How a good accountant helps
A good accountant should do more than prepare accounts after the event. They should help reduce enquiry risk by making sure returns are accurate, records are complete and tax positions are properly considered.
If HMRC does open a check, your accountant should help you understand what HMRC is asking for, gather the right records, respond clearly and avoid giving inaccurate or unnecessary information.
They should also help identify whether HMRC’s questions are reasonable, whether more time is needed and whether any proposed adjustments are correct.
Final thought
An HMRC enquiry is not always a sign that something is wrong, but it should always be taken seriously.
The best protection is not panic after the letter arrives. It is having accurate records, strong systems, regular reviews and an accountant who understands your business before HMRC asks questions.
For limited companies, the goal should be simple: know your numbers, keep proper evidence, file accurate returns and deal with HMRC professionally if a check ever arises.
Call to action:
At williams lester accountants, we help limited companies keep accurate records, understand their tax position and deal with HMRC confidently. If you are worried about the likelihood or implications of an HMRC enquiry, speak to us before it becomes a problem.