If you’re asking whether you need an accountant as a sole trader, the honest answer is that HMRC doesn’t require you to have one. You can file your own Self Assessment tax return, keep your own records, and manage your own affairs. Plenty of people do.

But in our experience working with sole traders across Greater Manchester and the UK, the question isn’t really about legal obligation — it’s about whether doing it yourself actually makes financial sense once you weigh up the time, the risk, and what you might be leaving on the table. Most of the time, it doesn’t. Here’s how we think about it.

Sole traders are not legally required to hire an accountant. Unlike some other jurisdictions, UK law doesn’t mandate professional involvement in your Self Assessment filing. You’re perfectly entitled to complete and submit your tax return yourself via HMRC’s online service.

That’s the factual position. But “you can do it yourself” and “you should do it yourself” are very different statements. The self-assessment system sounds straightforward until you’re sitting in front of it trying to work out which expenses are allowable, whether you’ve accounted for your payments on account correctly, or how to handle income from multiple sources.

We see this regularly: sole traders who’ve filed their own returns for years, often leaving money unclaimed — use of home, mileage, professional subscriptions, equipment — simply because they weren’t sure what was allowable and defaulted to caution. The unclaimed tax relief doesn’t show up as an obvious mistake. It just quietly costs you year after year.

So while the legal answer is clear, the practical answer is more nuanced. The question isn’t whether you must have an accountant — it’s whether you’d be better off with one.

It’s worth being specific about what you’re actually getting, because “accountant” can mean a lot of things. For a sole trader, the core work typically covers:

• Self Assessment filing — preparing and submitting your annual tax return accurately and on time, including making sure all allowable expenses are claimed.
• Bookkeeping and record-keeping — keeping your income and expenses organised throughout the year, not just at January deadline time.
• Tax planning — making sure you’re structured sensibly, your payments on account are set correctly, and you’re not overpaying HMRC.
• Advice when it matters — whether that’s taking on staff, registering for VAT, or deciding whether to incorporate as a limited company.

Beyond the mechanics, a good accountant gives you a clearer picture of how your business is actually performing. That might sound like something only larger businesses need — but sole traders make financial decisions constantly, and making them with accurate information versus rough guesses makes a real difference.

We also find that sole traders who work with us spend significantly less time worrying about tax. That’s not a soft benefit. It has a real value when you’re trying to focus on the work that actually earns you money.

One area where the numbers get quite concrete is HMRC penalties. If you miss the 31 January filing deadline, HMRC charges an automatic £100 penalty — regardless of whether any tax is owed. After three months, daily £10 penalties begin to accumulate, up to a further £900. At six months, a further charge of 5% of the tax due or £300 applies, whichever is higher. At twelve months, that charge repeats.

On top of the filing penalties, late payment attracts separate charges: 5% of the unpaid tax at 30 days, again at 6 months, and again at 12 months — plus interest on the outstanding amount throughout.

None of this requires you to have done anything deliberately wrong. It can happen through disorganisation, a busy period, or simply not knowing the rules. An accountant removes this risk almost entirely — deadlines are tracked, returns are prepared in advance, and you’re not scrambling in January.

For context, if a basic Self Assessment service costs between £200 and £400 per year, a single late filing that runs for several months can cost you more in penalties alone. The maths tends to favour getting professional support.

There’s a timely reason this question has become more pressing in 2026. From 6 April 2026, sole traders and landlords with total annual income above £50,000 are required to use Making Tax Digital for Income Tax (MTD for IT). This means using HMRC-compatible software to keep digital records and submit quarterly updates to HMRC — rather than a single annual Self Assessment return.

More than 860,000 sole traders and landlords fall into this first wave. The threshold drops further in subsequent years: £30,000 and above from April 2027, and £20,000 and above from April 2028. So if you’re not caught now, you may well be within the next two years.

HMRC has confirmed that penalty points for late quarterly updates won’t be applied during the first tax year for those required from April 2026 — a grace period of sorts. But the practical burden of quarterly digital reporting is real, and it’s substantially more administration than an annual tax return.

If you’ve been managing your Self Assessment yourself up to now and it was working, MTD changes that equation. Four quarterly updates per year, in addition to an end-of-period statement, requires either compatible software you’re confident using or someone managing it on your behalf. This is exactly the kind of shift where having an accountant already in place — rather than scrambling to find one when you’re already behind — makes a significant difference.

To be fair about it: there are sole traders for whom DIY works well. If your income is from a single, straightforward source, your expenses are minimal and clearly documented, you’re comfortable with software like HMRC’s own free tools, and you have the time and discipline to stay on top of it — then self-filing is a reasonable option.

This is typically the position of someone who’s recently started out, earning relatively modestly, with simple finances and a genuine interest in managing the numbers themselves. Some people find it straightforward. Some enjoy it.

The calculus changes when your income grows, when expenses become more varied, when you take on staff or subcontractors, when you start receiving income from multiple sources, or when MTD obligations kick in. At that point, the time cost and risk of error both increase — and the potential savings from professional tax advice start to outweigh the accountant’s fees quite comfortably.

Our honest position: if you’re asking the question, you’ve probably already reached a stage where getting support makes sense. People who are genuinely fine on their own tend not to be googling it.