Whether you need an accountant as a sole trader is a fair question, and the honest answer is: it depends — but probably more than you think. HMRC doesn’t legally require you to hire one, and plenty of sole traders file their own Self Assessment returns every year without incident. So far, so encouraging.

But there’s a difference between getting away with it and doing it well. Filing your own return when your finances are simple is perfectly reasonable. Filing it when your income has grown, your expenses are varied, or the rules are changing around you — that’s where things get more expensive in the long run.

We work with sole traders at all stages, from first-year freelancers to established consultants turning over six figures. What follows is our honest view on where professional help earns its keep and where it genuinely might not.

Let’s be straight about this: there is no law that says a sole trader must use a qualified accountant. HMRC allows you to prepare and file your own Self Assessment tax return, and many people do — particularly in the early years when income is modest and the setup is clean.

If you’re a freelancer earning a single income stream, keeping decent records, and confident with numbers, doing your own Self Assessment is a reasonable choice. Free and low-cost software options exist, and HMRC’s own guidance is reasonably clear for uncomplicated cases.

That said, ‘you can do it yourself’ isn’t quite the same as ‘you should.’ The question worth asking isn’t whether it’s legal to self-file — it’s whether it’s actually costing you less to do so. When you factor in the hours spent, the risk of missing allowable expenses, and the penalties if something goes wrong, the calculation often looks different than it did at first glance.

The late filing penalties alone carry some sting: an immediate £100 fine, daily £10 charges after three months (up to £900), and further percentage-based penalties at six and twelve months. Most sole traders don’t realise how quickly a missed deadline compounds.

The most obvious benefit is accuracy — knowing your return is correct, filed on time, and that you’ve claimed everything you’re entitled to. In our experience, sole traders who manage their own returns tend to under-claim on expenses. Not because the rules are particularly complex, but because they don’t know what they don’t know.

A good accountant also helps you understand your tax position in advance. Rather than discovering what you owe in January and scrambling to find the cash, you’re planning quarterly and setting money aside sensibly. That alone reduces a significant amount of stress for most self-employed people.

Beyond the compliance side, the value tends to show up in areas like:

• Identifying allowable expenses you hadn’t considered — use of home, mileage, equipment, subscriptions
• National Insurance planning — Class 2 and Class 4 NIC can catch people out
• Timing income and expenses to manage tax across two tax years
• Spotting when incorporation might make sense — and being honest when it doesn’t

UK sole traders typically pay between £150 and £1,200 per year for professional accounting support. At the lower end of that range, the cost is easily justified against the time saved alone, let alone any tax efficiency gains.

If you’re a sole trader with total annual income from self-employment and property above £50,000, Making Tax Digital for Income Tax (MTD for IT) applies to you from 6 April 2026. That’s not a future consideration — it’s now.

MTD requires you to use compatible software to keep digital records, submit quarterly updates to HMRC, and file your final tax return by 31 January each year. It’s a meaningful change to how Self Assessment works, and it’s caught a number of sole traders off guard who assumed the system they’d always used would continue unchanged.

For sole traders who were just about managing their own returns under the old annual filing process, the quarterly reporting requirement under MTD adds a layer of complexity that tips the balance firmly towards getting professional support. Not because the tasks themselves are impossible, but because the cadence and the compliance obligations are now more demanding.

If your income is approaching or above that £50,000 threshold, the question of whether you need an accountant as a sole trader has a clearer answer today than it did two or three years ago. An accountant who sets you up on compatible cloud software, manages the quarterly submissions, and keeps you MTD-compliant removes a significant administrative burden.

We’re not going to pretend everyone needs an accountant from day one. If your circumstances are genuinely simple, self-filing is a legitimate option and we’d rather say so clearly than overstate the case.

DIY Self Assessment tends to work well when:

• You have a single source of self-employment income with no property, investments, or overseas income
• Your annual turnover is modest and well below the VAT registration threshold (currently £90,000)
• Your expenses are straightforward and you’re keeping records throughout the year
• You’re comfortable with numbers and have time to engage with the process properly
• Your income is below the £50,000 MTD threshold, at least for now

Even in these situations, a one-off review with an accountant when you’re starting out — or if your situation changes — can be worthwhile. Think of it less as outsourcing your tax affairs and more as a sense-check that your approach is sound.

Where it stops working is when your income grows, your expenses become more varied, you take on employees or a business partner, or MTD kicks in. At that point, continuing to self-file starts to look like a false economy rather than a sensible cost saving.