UK, July 2026- When your business is built on selling expertise in consultancy, law, architecture, design, IT, and recruitment, the finances look deceptively simple. There's no stock to count, no machinery to depreciate, often no premises beyond a laptop. Yet people in professional services run into money and tax trouble just as often as any other business owner, and usually for the same handful of reasons. Here are the ones that come up most.

1.Lumpy income, steady bills

Fee income rarely arrives evenly. One month brings three big invoices, the next brings none, and slow-paying clients stretch things further. The classic mistake is treating everything in the bank account as spendable and leaving nothing aside for tax. Moving a fixed slice of every invoice — 25 to 30 per cent is a sensible habit into a separate tax pot as it's paid removes most of the panic before it can start.

2. The payments on account ambush

The first good year of self-employment often ends with a nasty surprise. Your January bill isn't just the tax you owe; HMRC adds half of next year's estimated bill on top, with the other half due in July. Almost nobody warns new consultants and freelancers about payments on account, which is why so many discover them the hard way.

3. Choosing, or outgrowing, the wrong structure

Plenty of people start as sole traders and simply never revisit the decision. But the sums behind sole trader versus limited company have shifted, corporation tax is no longer a flat 19 per cent, and dividend tax has crept upwards, so a structure that made sense at £40,000 of profit may cost you money at £90,000. This is a decision to review as profits change, not one to make once and forget.

4. IR35 and the off-payroll rules

For consultants and contractors working through their own company, IR35 can be the difference between a healthy take-home and a painful one. Larger clients now decide your employment status for tax, but the contracts you sign and the way you actually work still shape the outcome. Getting it wrong in either direction, paying tax you didn't owe, or facing a bill you didn't expect, is expensive.

5. Drifting past the VAT threshold

VAT registration kicks in at £90,000 of turnover, measured over any rolling twelve months rather than your accounting year. Service businesses with a strong run of contracts cross it mid-year without noticing, then face late registration penalties plus VAT they never charged their clients. Work for overseas clients adds another layer, because the place of supply rules decide whether those fees count at all.

6. Expenses: claiming too much, or too little

Home office costs, travel to client sites (watch the 24-month rule), training, software, professional subscriptions, the rules on each are more specific than people assume. Some claim things that were never allowable, like client entertaining. Just as many leave genuine deductions unclaimed for fear of getting it wrong, and quietly overpay year after year.

7. Making Tax Digital is no longer on the horizon

Since April 2026, sole traders with income over £50,000 have had to keep digital records and send HMRC quarterly updates, with lower income bands following over the next couple of years. The spreadsheet-and-shoebox approach is running out of road, and setting up proper software calmly beats scrambling into it mid-year.

Getting ahead of it

None of these problems is exotic. They're simply easy to miss when your days are filled with client work, which is rather the point of running a professional services business. Specialist professional services accountants, such as Allenby Accountants, handle these exact issues all year round, from structure reviews and IR35 checks to VAT registration and Making Tax Digital setup. A short conversation before the deadlines tends to cost a great deal less than the clean-up afterwards.

About Allenby Accountants

A London-based accounting firm, Allenby Accountants, offers specialised services to businesses in an array of industries, including restaurants, SMEs, and contractors. With a concentration on client-first methods and technology-driven solutions, Allenby Accountants helps businesses in achieving long-term growth, efficiency, and compliance.

Company Address:

Address: Brook House 54a, Cowley Mill Road Uxbridge UB8 2FX
Phone No: 0208 914 8887
E-mail: [email protected]
Website: https://www.allenbyaccountants.co.uk/