If you've been searching for what a sole trader accountant costs, you've probably already noticed the numbers vary wildly — anywhere from under £100 for a basic tax return to £200 or more per month for a fully managed service. That spread isn't random. It reflects genuine differences in what you're actually buying.

The honest answer is that sole trader accounting fees in the UK typically fall between £200 and £600 per year for a straightforward self-assessment return, and £50 to £200 per month if you want ongoing bookkeeping support alongside that. But those ranges only make sense once you understand what drives them — and right now, there's a structural reason why fees at the lower end of the market are under pressure: Making Tax Digital for Income Tax Self Assessment (MTD ITSA), which came into force for sole traders earning above £50,000 from April 2026.

Here's how we think about sole trader accountant pricing, and what you should actually be comparing when you get quotes.

The most common arrangement for a straightforward sole trader — one income stream, no VAT registration, no employees — is an annual fixed fee covering the self-assessment tax return, basic tax planning advice, and perhaps a short review call around the January deadline. That tends to land between £200 and £600 per year, with most established practices sitting somewhere in the £350 to £500 range.

Real-world numbers from sole traders discussing fees online bear this out: paying £460 to £550 per year including VAT is broadly typical for a competent, responsive firm handling a reasonably simple self-employment situation. If you're being quoted significantly less than £250, it's worth asking what's actually included — at that price point, you're usually looking at a basic return-filing service with minimal advisory input.

For sole traders who want more than compliance — monthly or quarterly bookkeeping, proactive tax planning, help with cashflow — the cost structure shifts to a monthly retainer. Those typically run from around £50 per month for low-volume bookkeeping support, rising to £150 to £200 per month or more for a fuller managed service. The right choice depends on how complex your finances are and how much time you're currently spending managing them yourself.

One thing we'd push back on: the instinct to find the cheapest option. In our experience, the difference between a £200 and a £450 engagement isn't just service quality — it's whether the accountant is actually looking at your numbers proactively or simply filing whatever you send them.

Accountants price sole trader work based on a handful of practical variables. The most significant ones are:

• Transaction volume. A sole trader with ten invoices a month and no business bank account takes far less time to service than one with multiple income streams, expenses across several categories, and a busy card reader. More transactions means more bookkeeping time, which means a higher fee.
• VAT registration. If you're VAT-registered, the accountant needs to prepare and file quarterly returns. That's meaningful additional work, and most firms price it separately — typically adding £100 to £300 per year to a basic engagement, depending on frequency and complexity.
• Whether you do your own bookkeeping. If you arrive with clean, reconciled records in Xero or a comparable platform, the accountant's job is much simpler. If you arrive with a carrier bag of receipts in March, the time cost — and the fee — rises accordingly.
• The level of advisory input you want. A firm acting as a genuine business adviser — reviewing your margins, helping you plan around tax reliefs, thinking about whether it makes sense to incorporate — is doing more work than one that files your return and goes quiet for twelve months.
• The firm's own positioning. A boutique chartered firm with a specialist focus will charge differently from a volume-processing operation. Neither is inherently wrong for every client, but they're not the same service.

The cheapest quote rarely represents the best value. That said, paying more doesn't automatically mean getting more — it depends on what the firm actually delivers for the fee.

From April 2026, sole traders and landlords with qualifying income above £50,000 are required to comply with Making Tax Digital for Income Tax Self Assessment. That means quarterly digital submissions to HMRC through compatible software, rather than a single annual self-assessment return.

This is a meaningful shift in workload for accountants servicing those clients. Where a straightforward sole trader previously generated one substantive piece of work per year — the return — MTD ITSA requires four quarterly updates, a year-end finalisation submission, and the ongoing software infrastructure to support them. Practices that haven't already priced for this are having those conversations with clients now.

If you're a sole trader above the £50,000 threshold, you should expect your accountant's fee to reflect this additional compliance burden. If you've been on a flat fee for several years and haven't had a conversation about MTD ITSA yet, it's worth raising it proactively rather than being surprised at renewal.

For sole traders below the threshold — the £30,000 threshold is expected to apply from April 2027 — the same trajectory is coming, just on a slightly longer runway. Getting your digital record-keeping in order now, ideally on a cloud accounting platform, makes the transition considerably easier and can reduce the compliance cost of the eventual switch.

We've been helping clients set up and migrate to cloud accounting for years, so this is familiar territory for us — but it's genuinely worth treating MTD ITSA as a planning item rather than something to deal with when the letter arrives.

A lot of sole traders do their own self-assessment, at least in the early years. For a very simple situation — one income source, minimal expenses, no complications — that's entirely reasonable. HMRC's own filing system works, and if your finances are genuinely straightforward, a professional is adding limited value.

The calculation changes in a few scenarios. The first is when the time cost of doing it yourself starts to add up. If you're spending four or five hours a year gathering records, cross-referencing expenses, and navigating the self-assessment portal, you're paying yourself less than most of us would consider a reasonable hourly rate to do compliance administration. At £400 to £500 per year for a competent accountant to handle it, the economics usually tip pretty quickly.

The second is when your situation becomes anything other than simple. Multiple income sources, employment income alongside self-employment, overseas income, property income, pension contributions, capital gains from an asset sale — any of these introduce genuine complexity where an accountant's input pays for itself in tax saved, not just time recovered.

The third is when you're growing. A sole trader turning over £60,000 and thinking about whether to incorporate, whether to bring in subcontractors, whether to register for VAT — these are decisions with meaningful financial consequences. The right accountant isn't just filing your return; they're helping you make better decisions with your business structure and your money.

We tend to tell prospective clients: if you're at the point where you're asking whether an accountant is worth it, you're probably at the point where one is.