One of the most common questions we get from people starting out as sole traders is: how much is an accountant for a sole trader? It’s a reasonable thing to want to know upfront, and yet the answer you’ll find online varies enormously — from £150 a year to £150 a month, depending on where you look.

The honest answer is that sole trader accounting costs genuinely do vary, and they vary for good reasons. The complexity of your income, whether you’re VAT registered, how organised your records are, and what level of support you actually want — all of these shift the number considerably.

What we can do is give you a clear, honest picture of what the market looks like, what drives the price up or down, and how to work out what’s worth paying for. No waffle, just a practical steer.

Based on current market data and our own experience, here’s a realistic picture of what sole traders are paying for accountancy services in the UK right now.

For a very basic setup — a straightforward self-employment income with clean records and minimal complexity — annual accounts and a Self Assessment tax return will typically cost somewhere between £150 and £400 per year. That’s broadly what most accountants charge for a no-frills compliance job.

Once you move to a monthly retainer arrangement — which gives you ongoing access to your accountant, bookkeeping support, and proactive advice throughout the year — costs tend to sit in the £80 to £150 per month range for a typical sole trader.

For more complex businesses, perhaps with significant turnover, multiple income streams, employees, or VAT registration, the cost scales accordingly. It’s not unusual to see fees of £600 to £1,200 per year at that end of the spectrum.

Hourly rates for ad-hoc work generally run between £50 and £150 per hour, though most established accountancy practices prefer fixed pricing for ongoing work — it’s more predictable for both sides.

The key point: price variation isn’t random. It reflects what you’re actually getting.

Understanding the factors behind the price helps you make a better decision about what to buy. Here’s what we look at when quoting for a sole trader client.

Complexity of income

A sole trader with one client and a single invoicing stream is a quick job. A sole trader with rental income, PAYE employment alongside self-employment, cryptocurrency transactions, or overseas clients is a very different matter. More sources of income means more time, and time is what you’re paying for.

Turnover level

Higher turnover generally means more transactions to review and more to consider in terms of tax planning. A business turning over £150,000 a year needs more careful handling than one at £10,000 — not just in volume, but in terms of the decisions worth making around VAT, allowable expenses, and planning ahead.

How organised your records are

This one catches people off guard. If you hand over a shoebox of receipts in January, that costs more to process than a neatly reconciled Xero file. Good bookkeeping — whether you do it yourself using cloud software or pay for it as part of a package — keeps your accountancy bill down.

VAT registration

If you’re VAT registered, your accountant will typically need to prepare and file quarterly VAT returns under Making Tax Digital. That adds meaningful ongoing work, and it’s usually priced separately or bundled into a higher tier.

Level of service

A once-a-year tax return is a commodity. Proactive advice, year-round access, and someone who flags an issue before it becomes a problem — that’s worth paying more for.

There are broadly two ways to pay for sole trader accounting: a one-off annual fee, or a fixed monthly retainer. Both have their place, but they suit different situations.

Annual (or one-off) fees work well if your finances are genuinely simple, you’re comfortable managing your own bookkeeping, and you just need someone to file your Self Assessment accurately each year. You’ll typically engage them once the tax year ends, provide your records, and pay a fixed fee for the job.

The limitation is that you get nothing in between. If a tax question comes up in March or you want to know whether a particular expense is allowable, you’re on your own — or you’re paying an hourly rate for a call.

Monthly retainers give you ongoing access and usually cover far more: bookkeeping support, VAT returns if relevant, regular check-ins, and someone who actually knows your business throughout the year. For most sole traders who are running an active business — not just picking up occasional freelance work — this tends to be the better model.

In our experience, the clients who get the most value from an accountant are the ones who treat them as a year-round resource, not a January panic-fix. The tax savings and avoided mistakes typically outweigh the additional monthly cost many times over.

We’re obviously not neutral on this question, so let’s be transparent about that. But we’d also push back on the idea that it’s automatically a luxury.

The sole traders who tell us they don’t need an accountant because their finances are simple are often the ones making the most avoidable mistakes: overclaiming expenses in a way that would concern HMRC, underclaiming allowable costs and paying more tax than they need to, or missing the deadline for filing and paying penalties they didn’t budget for.

HMRC’s own data consistently shows that errors on sole trader Self Assessment returns are common. The question isn’t whether mistakes happen — it’s whether you have someone in your corner to prevent them.

Beyond compliance, a decent accountant should be helping you understand what you’re actually keeping after tax, what you can pull out of the business, and how to structure things sensibly as you grow. That kind of clarity has a real commercial value that’s hard to put a single number on.

Our honest view: if you’re billing above £20,000 a year as a sole trader, or your income is anything other than completely straightforward, the cost of a good accountant almost always pays for itself. If you’re genuinely at the very start with minimal income, a simple online filing tool might be sufficient for now — but do revisit that as you grow.