If you have recently gone self-employed and you are asking do I need an accountant as a sole trader, you are asking exactly the right question at exactly the right time. Most people ask it too late — after they have filed something incorrectly, missed a deadline, or realised they have been paying more tax than they needed to.

There are around 5.64 million small businesses in the UK, and a significant proportion of them are sole traders managing their own tax affairs. Some do it well. Many do not — not because they lack intelligence, but because Self Assessment, allowances, and record-keeping rules are more involved than HMRC’s guidance makes them appear.

Our view is straightforward: the right answer depends on your situation. What we want to do in this post is help you work out which situation you are actually in, rather than giving you a blanket answer that does not fit.

When sole traders ask whether they need an accountant, they are usually asking one of three slightly different questions:

• Can I legally handle my own tax? Yes, you can. There is no rule that says sole traders must use an accountant. HMRC accepts Self Assessment returns filed directly by individuals.
• Is it worth paying for one? That depends on what your time costs you, how complex your income is, and whether you are leaving money on the table through missed reliefs.
• What happens if I get it wrong? Penalties for late or incorrect returns, interest on underpaid tax, and HMRC compliance checks are all real risks — and they cost more than most accountancy fees.

The honest practitioner’s view is this: if your sole trader income is simple, consistent, and your only source of earnings, you can probably file your own Self Assessment return with care and the right software. But if your income is growing, involves multiple streams, or you have any uncertainty about what you can and cannot claim, an accountant is not an optional luxury — it is a practical investment.

We have seen too many sole traders arrive with two or three years of messy records and penalties accumulating, when a relatively modest annual fee would have kept everything clean from day one.

There is no point overselling professional help to someone who genuinely does not need it. If your situation looks like the following, self-filing is a realistic option:

• You have one source of self-employment income with straightforward expenses
• Your income is below the VAT registration threshold (£90,000 as of 2026) and you are not VAT-registered
• You have no rental income, investment gains, or foreign income to declare
• You keep accurate records throughout the year, not just in January
• You are comfortable using HMRC’s online system or dedicated accounting software

In this scenario, the Self Assessment return is not especially complex. The main risks are missing allowable expenses (which costs you money) and filing late (which triggers an automatic £100 penalty, with further charges after three months). Both are avoidable with discipline.

That said, even sole traders in this position often find that a one-off review by an accountant in their first year saves more than it costs, simply because they learn what they can legitimately claim — home office costs, equipment, professional subscriptions, mileage — that they might otherwise overlook.

The calculation shifts considerably once your sole trader finances become more involved. In our experience, the following situations are where professional support consistently earns its keep:

Your income is growing or variable

When income grows, so does your tax liability — and so does the importance of planning. An accountant can advise on payments on account, help you budget for tax bills before they arrive, and identify timing or structure decisions that reduce your liability legally.

You have more than one income source

Employment income alongside self-employment, rental income, dividends, or investment gains each interact in ways that are not always intuitive. Getting the order of allowances and reliefs wrong means paying more tax than you owe.

You are thinking about going limited

The sole trader versus limited company decision is one of the most consequential choices you will make as a small business owner. An accountant can model the actual tax and NI position for your specific income level — the answer is rarely obvious from general articles alone.

You are not confident in your records

If you find yourself scrambling for receipts each January, or you are not certain which expenses qualify, the cost of an accountant is almost certainly less than the tax you are overpaying or the stress of a compliance check. A good accountant saves more than they cost — that is not a cliché, it is consistently true in practice.

There is an additional consideration that makes this question more pressing right now. From 6 April 2026, sole traders and landlords with qualifying income above the relevant threshold must use compatible software to report income and expenses to HMRC under Making Tax Digital for Income Tax (MTD for IT).

This is not a minor administrative change. Under MTD for IT, you will be required to:

• Keep digital records of your self-employment income and expenses throughout the year
• Submit quarterly updates to HMRC — not just an annual return
• File a final declaration by 31 January, replacing the current Self Assessment return

There are two types of compliant software: tools that create and maintain digital records directly, and bridging software that connects existing records to the HMRC submission system. You can use more than one product, but only one per individual submission.

This shift to quarterly reporting is significant. It means that managing your own tax as a sole trader requires not just an annual effort in January, but an ongoing process throughout the year. For many sole traders, this is the point at which working with an accountant stops being optional and becomes genuinely practical — both to ensure compliance and to avoid quarterly filing becoming a recurring source of stress.

If you are not sure whether MTD for IT applies to you yet, or which software you should be using, it is worth getting clarity now rather than in April.