If the phrase “HMRC enquiry” makes your stomach drop, you’re not alone. The idea of someone combing through your numbers isn’t exactly a day at the beach. Here’s the good news: an HMRC enquiry isn’t automatically bad news. When you know what to expect and how to prepare, you can deal with it confidently — and often resolve it quickly.
At OnPoint Accounting, we help small business owners navigate HMRC every day. This guide explains what enquiries are, why they happen, what the process looks like, and how to protect yourself so you can sleep at night.
What is an HMRC enquiry?
An HMRC enquiry is simply HMRC checking your tax return to make sure it’s correct. There are two broad types. A full enquiry means HMRC looks at the whole return. An aspect enquiry means they focus on a specific area — for example, a particular expense category, your VAT treatment on a transaction, or your PAYE records. Crucially, an enquiry doesn’t automatically mean HMRC thinks you’ve done something wrong. Returns can be selected because something looks unusual compared with industry norms, because third-party data doesn’t match the figures submitted, or because you were chosen at random.
Why does HMRC open enquiries?
There are a few common triggers. Inconsistencies between your return and data HMRC already holds — such as bank interest, PAYE submissions, or figures reported by third parties — will often prompt a look. Unusual claims, like a jump in expenses or an unexpected loss, can also raise questions. Some sectors are monitored more closely than others. And sometimes you’re simply picked as part of HMRC’s routine random checks. None of these, on their own, signal wrongdoing; they just invite clarification.
What to expect if you’re contacted
You’ll receive a formal letter explaining that your return is under enquiry, which areas HMRC wants to review, and what information they’d like from you. Requests typically include invoices, receipts, bank statements, and explanations of how you arrived at certain figures. Timelines vary with complexity. Straightforward enquiries can wrap up in weeks; more involved cases take longer. The key is to respond on time and provide clear, complete information. Once HMRC is satisfied, they’ll close the enquiry. If they identify errors, they’ll adjust your tax position and may charge interest or penalties, depending on the circumstances.
How to protect yourself — and your sanity
Strong bookkeeping is your best defence. Keep accurate records, reconcile regularly, and store supporting documents for at least six years. If you discover a mistake, be upfront; voluntary, early disclosure almost always leads to a better outcome. Never ignore HMRC correspondence — deadlines matter and silence only makes problems bigger. And don’t feel you have to go it alone. Having a professional deal with HMRC on your behalf keeps everything accurate and calm, and it stops a manageable process turning into a time-sink.
One practical safeguard many clients choose is fee protection insurance. In short, if HMRC opens an enquiry, the policy covers our professional fees to handle it for you. It’s not a licence to be sloppy; it’s peace of mind that the costs of defending a good-faith position won’t land in your lap.
The OnPoint approach
We see enquiries as a process to manage, not a crisis to fear. We start with tidy records, clear explanations, and prompt, professional responses. We keep you informed without drowning you in jargon, and we push for closure as quickly as the facts allow. Most enquiries resolve cleanly when the numbers add up and the narrative is coherent. Our job is to make sure they do.
Final thoughts
An HMRC enquiry can feel intimidating, but it doesn’t have to derail your business. With good records, timely responses, and the right support, most cases are resolved without drama. If you’ve received a letter — or you just want the reassurance that you’re ready if one arrives — we’re here to help.
Want expert backup and optional fee protection cover? Book a free discovery call with OnPoint Accounting and let’s put a plan in place before HMRC ever knocks.