HMRC’s own term for most of this work is a compliance check. It can cover any tax you pay. In practice that means your VAT returns, your Company Tax Return and the corporation tax calculation, your Self Assessment, and the PAYE and RTI records behind your payroll if you employ people. The accounts and workings underneath all of it are fair game too.

Aspect checks and full enquiries

An aspect check looks at one thing: a single VAT quarter, one expense category, a director’s loan account. A full enquiry opens the whole return and runs for months. Most businesses that get contacted get the first kind. The letter will tell you which it is by listing what HMRC wants to see.

What draws attention

• Gross margins out of line with the rest of the trade, which is common in shops and takeaways where till records are patchy
• VAT repayment claims, especially a first one
• Big swings in turnover or costs from one year to the next with no explanation in the accounts
• Figures that do not agree with data HMRC already holds, such as card acquirer takings or income reported by Airbnb and Booking.com
• Returns filed late, filed and then amended, or filed with estimates

Some cases are picked at random, so a clean record is no promise of a quiet life. Read the HMRC guidance on compliance checks if you want the official wording, then send the letter to your accountant.

HMRC writes or phones to say what it wants to look at and by when. If you have appointed an agent, HMRC contacts the accountant rather than you, which is the single biggest practical reason to have one in place before anything happens.

Information notices and deadlines

HMRC can ask for documents informally, or issue a formal information notice with a date on it. Miss that date and a penalty can follow, unless there is a reasonable excuse such as serious illness or a bereavement. Asking for more time before the deadline passes usually works. Asking afterwards rarely does.

Visits

An officer may want to come to your business premises, your home if you trade from it, or your accountant’s office. You can have your accountant with you, and for a VAT check on a shop or takeaway you should. Most of what goes wrong in a visit goes wrong in conversation, not on paper.

The result

HMRC writes to tell you the outcome. If more tax is due, payment is generally expected within 30 days. Penalties depend on why the tax was underpaid, how quickly you told HMRC, and how well you co-operated during the check. If you disagree with the decision you can appeal, and you can apply for alternative dispute resolution at any point while the check is running.

Keep every letter and note the dates. Your accountant will need both.

Strip away the brochure language and the product is simple. It pays the professional hours spent defending you when HMRC opens a check. Those hours go on things like this:

• Reading the opening letter and working out what HMRC is really asking
• Reconstructing records where the bookkeeping is thin, which is where most of the time goes
• Writing the responses and handling the back and forth, which can run across several months
• Attending a visit or a meeting with the officer
• Arguing penalty behaviour, because the difference between careless and deliberate changes the bill significantly
• Preparing an appeal or an ADR application if the decision is wrong

What stays with the business

The tax itself, the interest on it, and any penalty remain yours to pay. Cover deals with the cost of the defence. A handful of specialist policies in the wider market add liability protection at a much higher premium, and that is a different product aimed at a different risk.

Why the hours matter more than the headline

Policies advertise large maximum limits. The limit is rarely the thing that bites, because very few small business enquiries get anywhere near it. What matters is whether anyone picks up the file quickly and whether the person handling it has dealt with HMRC on your type of business before. Ask about that before you ask about the limit.

Being clear about the gaps is more useful than another list of features.

It does not stop the check

Nothing stops HMRC opening a compliance check. Good records, filed on time, with a sensible explanation for anything unusual, shorten one. Cover changes who pays for the work, not whether the work happens.

It cannot be bought retrospectively

Fee protection schemes across the market respond to enquiries opened after the cover is in place. Once the letter has landed, the window has closed. This is the single most common disappointment we see, and it is why the decision is worth making while nothing is going on.

Deliberate behaviour is out

Where HMRC finds deliberate understatement or fraud, no scheme in the market stands behind it. Penalties and interest caused by consistently late filing sit in the same place.

Cover is only as good as the person using it

Plenty of firms sell cover that routes the work to a panel adviser you have never met. That can work. It can also mean a stranger learning your business from scratch while the clock runs. Ask who will actually write the letters and attend the visit, and get the answer before you sign anything. If you want to know how ours works for your business, ask Mudassir and you will get a straight answer the same working day.

The usual model is an annual add-on. The practice buys a block policy from an insurer, then sells places on it to clients, commonly in the range of £300 to £1,000 a year depending on turnover and whether directors and partners are included. It often appears on a renewal notice with an opt-out rather than an opt-in, which is why many owners pay for it for years without ever reading what it says.

The tax treatment

HMRC generally treats fee protection premiums as non-deductible for the business, so you do not get tax relief on the cost in the way you would on most running expenses. Treatment depends on how the policy is written and who it covers, so check the position with your accountant rather than assuming.

How we do it

Tax investigation cover is included free for every client here. There is no annual add-on, no opt-out box, and no separate line on the renewal. It sits alongside the way we price everything else: a fixed fee agreed in writing before any work starts, with calls, meetings and emails never charged on top. Every HMRC investigation this practice has handled, it has won. That is a record of what has happened, not a prediction about your case.

If you are paying an add-on at the moment, dig out the renewal and see what you are getting for it.

When a letter arrives, you photograph it and send it over. We reply the same working day, and if the answer needs longer we come back that day to say when. As your authorised agent we become the point of contact, so the phone calls and the deadlines come to us.

Before we write a word to HMRC, we go through your own records. That order matters. Half the time the figures HMRC is querying turn out to be explainable, and the other half we would rather find the problem ourselves than have an officer find it.

One example of what turns up

A client came to us owing HMRC around £20,000 across Corporation Tax, VAT and Self Assessment, with no real idea what the debts were for. We went through every line. A large part of the Self Assessment balance was payments on account set from estimates, so we filed his return early. That part of the debt was cancelled and HMRC wrote off the interest charged on it. He ended up knowing exactly what he owed and paying far less than the letter said.

That work happened because someone read the paperwork line by line. It is the same work a compliance check needs, and it is the work the cover is there to pay for. If HMRC has written to you and you have no accountant acting, answer the questions on this page and Mudassir will come back to you today.