If you’ve been searching for sole trader accountant cost figures, you’ve probably found a wide spread — anything from £150 to £1,500 a year quoted across different sources. That range isn’t wrong, but it isn’t especially useful on its own either. What actually matters is what sits behind those numbers: what’s included, what’s excluded, and whether the service genuinely helps your business or just files a form once a year.

In our experience working with sole traders across Greater Manchester and beyond, the question isn’t really “how cheap can I go?” — it’s “what level of support do I actually need, and what’s the right price for that?” Those are different questions, and the answers depend on your turnover, your complexity, and how much you want to rely on someone else to keep your finances in order.

This post lays out what the market looks like in 2026, what different fee levels tend to buy you, and how to work out which bracket makes sense for where your business is right now.

Based on current market rates, most sole traders in the UK pay somewhere between £300 and £1,200 per year for accountancy services, though costs can run lower for very simple arrangements and higher for more complex businesses.

Breaking that down more practically, you’re likely looking at three broad tiers:

• Self assessment only (basic): Roughly £200–£500 per year. Your accountant completes and files your Self Assessment tax return, usually with a quick review of your income and expenses. That’s the extent of it.
• Self assessment plus bookkeeping support: Roughly £600–£1,200 per year. This typically includes some ongoing bookkeeping help, quarterly check-ins, and more proactive communication across the year — not just at tax return time.
• Full-service monthly retainer: Roughly £50–£150 per month (so £600–£1,800 annually). This covers cloud software, bookkeeping, VAT returns if applicable, regular management information, and year-round access to your accountant for questions.

Online-only services can price lower than those ranges — sometimes as low as £25–£50 per month — but those tend to be automated platforms with minimal personal contact. They work for some sole traders; they don’t work for others. We’d suggest thinking carefully before choosing a service purely on price, particularly if your finances involve anything non-standard.

This is where a lot of sole traders get caught out. A low headline fee can look attractive until you realise it covers only the bare minimum — and that anything beyond that is charged as an extra.

At a minimum, a decent sole trader accountancy package should include:

• Preparation and filing of your annual Self Assessment tax return (SA100)
• Calculation of your Income Tax and National Insurance liability
• Basic advice on allowable expenses
• Liaison with HMRC on your behalf if needed

Beyond that, a genuinely useful service — particularly if you’re growing — will also include:

• Cloud accounting software (Xero, QuickBooks, FreeAgent) and guidance on using it
• VAT registration advice and returns if you’re VAT-registered or approaching the threshold
• Regular check-ins during the year, not just at January deadline
• Proactive alerts on tax payments due so nothing catches you off-guard
• Access to your accountant for questions by phone, email, or message

The last point is often underrated. One of the most consistent frustrations we hear from sole traders who’ve used other firms is that their previous accountant was unreachable. Responsiveness has real value — it stops small questions turning into expensive problems.

The honest answer: sometimes, yes. If you’re a freelancer with straightforward income from one or two sources, no employees, no VAT, and a tidy set of records, a lower-cost Self Assessment-only service can do the job perfectly well. There’s no point paying for support you don’t need.

But there are several situations where cutting costs on accountancy tends to be a false economy:

If you’re growing quickly

A business that’s growing tends to throw up tax and compliance questions at pace — when to register for VAT, whether you’d be better off as a limited company, how to handle a subcontractor or a new member of staff. An accountant who’s only engaged once a year won’t be positioned to help you navigate those decisions well.

If your records are informal

If you’re not keeping clean records through the year, a purely transactional service will either cost you more in additional hours or miss things that cost you more in tax. A proactive accountant who helps you stay organised throughout the year tends to pay for themselves.

If you’re in a complex sector

Sole traders in construction (particularly under CIS), property, or e-commerce often have specific compliance requirements that a cut-price self assessment service simply isn’t set up to handle properly. Getting this wrong can be expensive.

Most modern accountancy firms — including us — have moved away from variable billing toward fixed monthly fees. There are good reasons for this on both sides.

For you as a sole trader, a fixed monthly fee means you know exactly what you’re paying, you’re not discouraged from picking up the phone with a question, and there are no unexpected invoices at year-end. It spreads the cost across the year rather than landing a large bill at tax return time.

For the accountant, it creates a proper ongoing relationship rather than a transactional one — which means they’re far more likely to be proactive and flag things before they become problems.

Pay-per-service arrangements still exist, and they can work if your needs are very infrequent and predictable. But the risk is that the scope of work becomes adversarial — you’re reluctant to ask questions because you’re worried about being charged, and the accountant is only engaged when you’ve explicitly asked for something. That’s not a great dynamic.

Our preference — and the model we work to — is a fixed monthly fee that covers everything you’d reasonably need across the year, with no surprise charges. It’s a cleaner relationship and a better outcome for the business.