If you’ve searched for sole trader accountant fees recently, you’ve probably found a range that goes from suspiciously cheap to eye-wateringly expensive — with very little explanation of what sits in between. That’s not especially helpful when you’re trying to make a sensible decision about your business finances.

The honest answer is that fees depend on a handful of practical factors: what services you actually need, how much admin you bring to the table, and whether you’re paying hourly or on a fixed monthly retainer. In our experience, most sole traders overpay for a basic service or underpay and end up with something that just about ticks the compliance box — without any real support behind it.

This post sets out what typical sole trader accountant costs look like in 2026, what drives fees up or down, and how to judge whether the price you’re being quoted represents good value.

The core service most sole traders need is a Self Assessment tax return filed with HMRC each year. For that alone, the average UK accountant charges somewhere between £150 and £400 plus VAT — though that range covers everything from a basic online return for a trader with straightforward income to a more complex submission involving multiple income streams, property, or untidy records.

A step up from that is an ongoing monthly arrangement, which typically includes your Self Assessment but also covers bookkeeping, quarterly check-ins, and proactive tax advice throughout the year rather than a one-off scramble in January. These packages tend to run from around £40 to £100 or more per month for sole traders, depending on turnover and complexity.

At DG Accountancy, our sole trader packages start from £41 per month — which includes HMRC registration, Making Tax Digital compliance, unlimited invoicing, a dedicated accountant, and your Self Assessment. The second tier, at £99 per month, adds VAT filing. Those prices drop further with our current promotional offer of 50% off the first three months.

The key thing to understand is that a one-off tax return and a full-service monthly arrangement are different products. Comparing them on price alone is like comparing a one-off MOT to a full service plan.

Many traditional accountancy firms still charge by the hour. That means the final bill depends on how long your work takes — which in turn depends heavily on how organised your records are, how many questions come up, and how efficient the firm’s processes are. For straightforward work, hourly billing can be reasonable. For anything more complex, it creates unpredictability that most small business owners find uncomfortable.

Fixed monthly fees have become the norm among modern online accounting practices, and for good reason. You know exactly what you’re paying each month, you can budget accordingly, and there’s no incentive for the accountant to make simple things complicated.

That said, fixed fees are only genuinely fixed when they’re scoped properly from the start. Be wary of headline prices that don’t include VAT returns, payroll, or your Self Assessment — those add-ons can quickly double the number on the quote. The right question to ask any accountant is: what exactly is included in this fee, and what would trigger an additional charge?

Transparent pricing isn’t just a nice-to-have. It’s the baseline you should expect from any firm you work with.

A few factors tend to push fees higher, and it’s worth being honest about where your business sits before you shop around.

Volume and complexity of transactions

A sole trader turning over £30,000 a year with clean invoicing and a single bank account is straightforward to service. One with the same turnover but four revenue streams, expenses across multiple categories, and six months of uncategorised bank transactions is considerably more work. Messy records cost real time — and that gets reflected in the price, rightly so.

VAT registration

Once you cross the VAT threshold (currently £90,000 as of June 2026) or register voluntarily, quarterly VAT returns add to the workload. Most accountants include this in a higher-tier package or charge it as an add-on. Either is fine, as long as it’s clear upfront.

Additional income streams

Rental income, dividends, investment gains, or freelance work alongside employment all add complexity to your Self Assessment. Each one needs to be reported correctly, and getting it wrong costs more to fix than getting it right first time.

How prepared you are

Honestly, one of the biggest variables is how much preparation you do before handing things over. Clients who keep their records tidy through cloud accounting tools like Xero generate far less chargeable work than those who bring a bag of receipts in February.

There’s a version of this question that comes up regularly: is it worth hiring an accountant as a sole trader at all, or can I just do it myself?

For very small hobby-type income — say, below the £1,000 trading allowance — HMRC’s own guidance is that you may not need to register for Self Assessment at all. But for anyone running a real business, even a modest one, the answer is almost always yes.

Here’s the practical case: an accountant who spots one legitimate expense category you’ve been missing, or flags that you’re paying the wrong amount in payments on account, will often save you more than their fee in the first year. And that’s before you factor in the time you’d otherwise spend — time that, for most self-employed people, has a real opportunity cost.

The more useful question isn’t whether to have an accountant, but what level of service genuinely fits your situation. If your finances are simple and you’re happy to keep your own records throughout the year, a lean fixed-fee arrangement focused on compliance is probably the right fit. If you’re growing, managing multiple income sources, or want proactive tax planning built in, a more comprehensive package pays for itself.

We tend to find that clients who come to us after years of DIY filing often have years of missed allowances behind them — not through any wrongdoing, just through not knowing what they didn’t know.