Whether you need an accountant as a sole trader is a question worth taking seriously rather than defaulting to a yes or no. If your income is straightforward — one source, modest turnover, no employees, no VAT — there’s a reasonable case for filing your own Self Assessment. HMRC’s online system is reasonably functional, and plenty of sole traders use it without issue.

But that’s a narrower category than most people assume. The moment you add a second income stream, start claiming expenses properly, hit the VAT threshold, or find yourself working evenings trying to figure out what counts as a deductible cost, the calculation shifts. An accountant stops being an overhead and starts being something closer to insurance — and often pays for itself in tax savings alone.

There’s also a bigger structural change coming. Making Tax Digital for Income Tax is landing in April 2026 for sole traders earning over £50,000, with lower thresholds following. That changes the admin picture significantly for a lot of people.

We’d be doing you a disservice if we said every sole trader needs an accountant. Some genuinely don’t — at least not year-round.

If you’re in the early stages of self-employment, earn below £30,000 from a single source, have straightforward expenses, and feel comfortable using HMRC’s online Self Assessment portal, there’s a reasonable argument for handling it yourself. The tax calculation on a simple sole trader return isn’t complicated. HMRC’s system does the maths for you once you’ve entered your figures.

The same applies if you run a very low-volume side hustle alongside employment — say, occasional freelance work where income and outgoings are easy to track. One spreadsheet, a few receipts, and a couple of hours in January can be enough.

Where people in this camp often trip up is not the filing itself — it’s the expenses. Most sole traders who self-file underclaim, either because they’re not sure what’s allowable or because they don’t want to get it wrong. That caution is understandable, but it quietly costs money year after year. Even a one-off review with an accountant can pay dividends here.

The honest answer is that most sole traders cross the threshold where an accountant becomes worthwhile sooner than they realise.

Here are the situations we see regularly where DIY quickly becomes a liability:

• Multiple income streams. Employment plus freelance, rental income plus self-employment, or a mix of CIS and direct contracts all create complexity. Splitting income correctly and claiming the right reliefs isn’t guesswork — it requires knowing the rules.
• VAT registration. Once you cross the VAT threshold (currently £90,000), you’re dealing with quarterly returns, scheme choices, and MTD-compliant software. A mistake here can cost more than a year’s accountancy fees in one go.
• Growing expenses. Working from home, using your own vehicle, equipment purchases, professional subscriptions — the list of allowable expenses is longer than most people know. An accountant maximises what you legitimately claim.
• Time. If you’re spending three or four hours a month on bookkeeping and tax admin, that’s three or four hours you’re not billing. At any reasonable day rate, the maths usually favours outsourcing it.
• HMRC enquiries. If HMRC opens an enquiry into your return, having an accountant who filed it — and can respond to queries professionally — is worth considerably more than the annual fee you paid.

From 6 April 2026, sole traders and landlords with annual income over £50,000 are required to use Making Tax Digital for Income Tax. That means keeping digital records of income and expenses using HMRC-compatible software, sending quarterly updates to HMRC throughout the year, and still filing a final return by 31 January.

Lower thresholds are being phased in after that — so if you’re earning over £30,000, this is coming for you too within the next couple of years.

This matters because it fundamentally changes the admin burden of being a sole trader. A once-a-year Self Assessment exercise becomes an ongoing, software-driven process with quarterly obligations. For someone who already hates the January scramble, the prospect of four quarterly updates plus a year-end submission is a real reason to reconsider managing it alone.

An accountant who sets you up on the right software — Xero is well-suited to this — and keeps your records current means the quarterly submissions are essentially automatic. You’re not doing four times the admin; you’re doing less of it, because things are captured as you go rather than reconstructed at year-end.

For sole traders approaching or above the £50,000 threshold, getting the right setup now rather than scrambling in April is genuinely the sensible move.

One thing that stops people from engaging an accountant is an assumption about cost — either that it’ll be expensive, or that they’ll be charged every time they ask a question.

For a sole trader, accountancy fees typically range from around £100 to £150 per month on an ongoing basis, or £150 to £600 or more for a standalone Self Assessment return, depending on complexity. That’s a wide range, and the right number depends on your turnover, whether VAT or CIS is in the picture, and what’s actually included.

At JD Accountancy, we scope our fees to the actual size and complexity of the work — not a flat rate that overcharges a one-person operation to subsidise larger clients. You get a fixed fee in writing before any work starts, and there are no charges for a quick call or a straightforward question mid-year.

When people weigh up the cost, they often forget to factor in what they’d save. Correct expense claiming, the right tax treatment of capital purchases, and avoiding even a modest HMRC penalty can easily offset a year’s fees. That’s not a promise of a specific saving — every situation is different — but it’s a realistic framing of the value.