Sole trader tax return mistakes that trigger HMRC enquiries


Most HMRC enquiries into sole traders do not start with fraud. They start with a return that looks odd enough for a computer to flag. Here are the mistakes that trigger those flags, and how to avoid them.

Claiming 100 percent of mixed-use costs

The classic: a car used for both business and school runs, with 100 percent of fuel, insurance and repairs claimed. Or the full mobile contract, or the entire home internet bill. HMRC expects apportionment, and it expects the method to be reasonable and consistent. Pick a defensible split, write down how you calculated it, and use it every year.

Income that does not match third-party data

HMRC receives data from banks, platforms and employers. If your declared turnover is 28,000 but your business bank account shows 45,000 of credits, expect a letter. This is the single most common trigger, and it usually comes from sloppy records rather than dishonesty: personal transfers mixed into the business account, or income banked but forgotten. One business account, used only for the business, eliminates most of this risk.

Big year-on-year swings with no explanation

Turnover doubling or halving between years is not wrong, but it is interesting to HMRC. If there is a reason (a big contract won or lost, a career break, a pivot), say so in the white space on the return. A one-line explanation now can prevent a six-month enquiry later.

Expenses that grow faster than income

A return showing flat turnover and expenses up 60 percent invites the question of what changed. Sometimes the answer is legitimate (new equipment, a one-off legal bill). If so, the capital allowances or the exceptional item should be visible and labelled. Unexplained margin erosion is one of the oldest enquiry triggers there is.

Missing the obvious disclosures

Rental income on the side, a crypto disposal, a grant received during the year: HMRC's data gathering keeps widening, and "I forgot" is not a defence that improves with repetition. Before you file, run through a checklist: employment, self-employment, property, savings, dividends, crypto, grants, overseas. Anything with money attached probably needs a line.

Late filing as a habit

A return filed late once is a penalty. A return filed late three years running is a pattern, and patterns attract attention. The filing deadline is 31 January; the payment deadline is the same day. Neither moves because you were busy.

Clean records filed on time with sensible claims rarely get a second look. If your bookkeeping is the weak link, that is the place to invest: professional tax compliance support, like the services at Finex Outsourcing, keeps sole trader returns accurate, explained and filed before the deadline rush.


 

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