One of the most common questions we hear from sole traders who are thinking about getting proper accounting support is a simple one: how much does an accountant for a sole trader actually cost? The honest answer is that it depends — but in a way that is worth explaining rather than leaving as a shrug.

Fees for sole trader accounting in the UK currently range from around £250 per year for a basic self-assessment return up to £1,000 or more for a full annual accounts and tax service. The spread is wide because "sole trader accountant" covers a lot of ground — a part-time freelancer with straightforward income is a very different engagement from a growing self-employed business turning over £150,000 with employees, subcontractors, and VAT to manage.

What follows is our honest take on how fees are structured, what drives them up or down, and — with Making Tax Digital for Income Tax coming into force from April 2026 — why the calculus around accountancy costs is shifting for a lot of self-employed people right now.

Before comparing prices, it helps to be clear about what is in scope. Many sole traders search for "accountant fees" and end up comparing quotes that cover entirely different services.

At the simplest end, an accountant prepares and files your Self Assessment tax return — they review your income, apply allowable expenses, calculate the tax due, and submit to HMRC. That is the minimum, and for a straightforward sole trader with modest income and clean records, it is often all that is needed.

A fuller service typically includes:

• Preparation of annual accounts (a profit and loss statement and a basic balance sheet)
• Self Assessment tax return preparation and submission
• Advice on allowable expenses and tax-efficiency opportunities
• Review of your bookkeeping records and correction of common errors
• Liaison with HMRC on your behalf if questions arise

Some accountants — and we would include ourselves here — go further still, advising on whether sole trader status remains the right structure as your business grows, flagging National Insurance implications, and helping you plan cash flow around payment on account dates.

The point is: a £250 fee and a £900 fee are rarely the same product. The key question is not which is cheapest, but which is right for where your business actually is.

Based on current market data, here is a reasonable picture of what sole traders are paying for accounting services in the UK:

• Simple self-assessment return only: £250–£500 per year, depending on the volume of income sources and whether the accountant needs to do significant tidying of your records first.
• Self-assessment plus basic annual accounts: £500–£1,000 per year. This is the most common package for an established sole trader with a single trade and clean records.
• Full accounts, tax return, VAT returns, and ongoing advice: £850–£1,500+ per year, or a monthly retainer of roughly £100–£250. For a VAT-registered sole trader with turnover approaching £150,000–£175,000, this is closer to the right benchmark.

For context, average monthly accounting fees across all business types sit at around £360 per month, but that figure includes limited companies with more complex compliance obligations. Sole trader fees typically sit below that average.

It is also worth knowing that approximately 58% of self-employed UK businesses do hire an accountant for their tax returns — so if you have been managing it alone and wondering whether that is normal, it is increasingly not. The remaining 42% using self-filing software tend to be at the lower end of the income spectrum, often in early-stage trading.

The single biggest factor in sole trader accounting fees is how clean and organised your records are. An accountant spending three hours reconstructing a year's worth of transactions from a shoe box of receipts is going to charge more than one working from a tidy Xero file.

Other factors that push fees upward:

• Higher turnover and transaction volume — more data to process, more risk to manage
• VAT registration — quarterly returns add meaningful time to the engagement
• Multiple income sources — property income, employment alongside self-employment, dividend income, foreign income
• Prior year corrections — unpicking previous self-filings that contain errors is time-consuming
• Late or disorganised records — rushed jobs before the January deadline cost more

What can keep fees sensible:

• Using cloud accounting software — Xero, QuickBooks, and similar platforms mean your data arrives structured rather than as raw bank statements. The accounting work becomes faster, and that saving gets passed on.
• Staying on top of expenses throughout the year — monthly reconciliation beats annual scrambling every time
• A clear brief to your accountant — knowing what you need (basic return vs. full advisory) avoids scope creep

In our experience, sole traders who invest modestly in cloud bookkeeping software and spend 20 minutes a month keeping records current will almost always pay less in accountancy fees over time than those who arrive in December with an inbox full of PDFs.

One reason sole trader accounting fees deserve a fresh look in 2026 is Making Tax Digital for Income Tax Self Assessment (MTD for ITSA). HMRC is rolling out mandatory quarterly reporting requirements for self-employed people and landlords in stages:

• From April 2026: sole traders and landlords with qualifying income over £50,000 must comply
• From April 2027: the threshold drops to £30,000
• From April 2028: it is expected to fall further to £20,000

MTD for ITSA requires digital record-keeping and quarterly updates submitted to HMRC using compatible software — it is not just a one-a-year filing exercise any more. For sole traders who come within scope, the annual self-assessment relationship with an accountant is effectively replaced by an ongoing quarterly one.

That shift has two implications for fees. First, an accountant managing quarterly submissions will typically charge more than one filing a single annual return — that is just a function of the additional work involved. Second, it makes the case for proper cloud accounting software considerably stronger, because the MTD-compatible tools also tend to make the quarterly compliance process much smoother for both you and your accountant.

If you are currently self-filing your Self Assessment and earning above £30,000 from self-employment, now is the right time to understand what MTD compliance will look like for your business and what it will cost to do properly. Leaving it until April 2027 is not a strategy.

This is the question underneath the pricing question, and we think the honest answer is: for most sole traders earning above roughly £30,000 per year, yes — provided the accountant is doing more than data entry.

A well-structured Self Assessment will consider all allowable expenses, claim capital allowances correctly, and make use of reliefs that many self-filers miss entirely. The tax saved will often be greater than the accountant's fee, which is why clients who switch from self-filing frequently comment that the engagement pays for itself. We hear that directly from clients who have been with us for years.

Beyond the pure tax arithmetic, there is a less tangible but real benefit: knowing your obligations are being handled properly. HMRC's own data suggests the self-assessment tax gap for small businesses runs at around 18.5%, representing roughly £5 billion in under-reported or incorrectly calculated tax annually. A significant portion of that is not fraud — it is honest error. An accountant who knows your affairs is your best defence against inadvertently contributing to that number.

For sole traders at the very early stages — low income, simple affairs, using software like FreeAgent or Xero — self-filing may well be sufficient for now. But as income grows, as VAT approaches, or as MTD obligations kick in, the case for professional support becomes increasingly clear.

The question is not really whether an accountant costs money. It is whether the return — in saved tax, avoided errors, and time freed up — justifies the outlay. In most cases we see, it does.