One of the most common questions we hear from sole traders is some version of: how much is an accountant actually going to cost me? It's a fair question, and the honest answer is that fees vary considerably depending on what you need, how organised your records are, and who you go to.

What we can tell you is that the old model — where you hand over a shoebox of receipts once a year and pay for a self-assessment return — is becoming less relevant by the month. Making Tax Digital for income tax is already live for sole traders earning above £50,000, and the threshold is coming down. The compliance landscape is changing, and that changes the value equation too.

This post sets out what sole trader accountancy typically costs in 2026, what affects the fee, and — more importantly — how to think about whether the spend is justified.

Let's start with the number that brought you here. For a straightforward self-assessment tax return — income from one self-employed source, no employees, no VAT, clean records — fees in 2026 generally sit somewhere in the range of £300 to £700 per year. Some sole traders report paying towards the top of that range or above, particularly in London, or where the records need significant tidying before a return can be filed.

Below that, you're moving into DIY territory: free or low-cost software, your own bookkeeping, and submitting the return yourself through HMRC's online portal. That's genuinely viable for some people — particularly those with simple finances and the time and inclination to keep on top of it.

Above the self-assessment-only level, costs increase depending on what else you're buying:

• Bookkeeping support — typically charged monthly, from around £50–£150 per month depending on transaction volume
• VAT returns — add-on cost if you're VAT registered, usually priced per quarter or bundled into a monthly package
• MTD-compliant software — cloud accounting platforms start from around £100 + VAT per month for sole traders needing Making Tax Digital compliance in 2026, though costs vary by provider and package
• Full managed service — bookkeeping, VAT, self-assessment, and ongoing advice as a monthly retainer can run from £150 to £400+ per month

The spread is wide because "accountant for a sole trader" covers everything from a once-a-year tax return to a near-full finance function for someone running a sizeable self-employed business.

If you've asked two or three accountants for a quote and got very different numbers, here's why.

The state of your records

This is the single biggest variable most people overlook. An accountant quoting for a self-assessment return is, in part, quoting for the time it will take to reconstruct your books if they're in poor shape. Arrive with a reconciled Xero or QuickBooks file and you'll pay less than if you hand over a year's worth of unmatched bank transactions. The cost of disorganisation gets passed on.

Complexity of income sources

A sole trader with one client and one bank account is a different proposition to someone with multiple revenue streams, foreign income, rental property, capital gains, or income from investments. Each layer adds time and therefore cost.

VAT registration

If you're VAT registered, quarterly returns need filing and your records need to be MTD-compliant for VAT. That's additional scope — priced accordingly.

Making Tax Digital for income tax

As of April 2026, sole traders and landlords with gross income over £50,000 must submit quarterly updates and an annual final declaration under MTD for income tax — with deadlines falling on 7 August, 7 November, 7 February, and 7 May each year. Roughly 864,000 people are affected in this first wave, with a points-based penalty system applying if submissions are missed. If you're in scope, your accountant needs to be set up to manage this — which adds to the service and, in most cases, the fee.

We're not going to pretend every sole trader needs to pay for professional accountancy. For some people, DIY is genuinely the right call — at least for a period.

If your income is straightforward, you're under the VAT threshold, you're below the MTD income tax threshold, and you're reasonably confident with numbers, the self-assessment return itself isn't technically difficult. HMRC's own portal handles the calculation once you've entered the figures, and there are free or low-cost tools — some providers offer free tiers for the simplest use cases — that make basic bookkeeping manageable without a professional.

The cash basis accounting method, available to sole traders with income under £150,000, also simplifies record-keeping considerably: you record money when it actually comes in or goes out, rather than when it's invoiced.

Where DIY tends to fall down is not in the mechanics but in the gaps. The tax reliefs you didn't know you could claim. The timing of a purchase that makes a material difference to this year's tax bill. The conversation about whether your structure still makes sense as income grows. These aren't things software fills in for you — and they're often where an accountant pays for themselves.

In our experience, the sole traders who regret not getting professional support earlier are rarely the ones who had a clean, simple business. They're the ones whose situation quietly got more complicated while they were busy running the business.

This is the question worth asking before comparing quotes: not "what will it cost?" but "what's the return on that cost?"

A decent accountant who knows sole trader tax well should, at minimum, identify reliefs and allowable expenses that offset a meaningful portion of their fee. That's table stakes. The more interesting return comes from a few other directions:

• Time. If you're spending two or three hours a month on bookkeeping and chasing your own records together each January, that's time you're either not billing or not spending elsewhere. At any meaningful day rate, the maths can shift quickly.
• Avoiding penalties. The new MTD penalty regime applies a points-based system — four points for missed quarterly submissions, two for the annual declaration, with a £200 charge per threshold reached. Getting that wrong once can cost more than a year's accountancy fee.
• Structural decisions. At some level of income, the question of whether to remain a sole trader or incorporate as a limited company has real financial consequences. That's not a conversation a piece of software has with you — it's a conversation with a practitioner who's seen where the numbers typically fall.

If you're working with an accountant who only surfaces at self-assessment time, you may not be getting the full value the relationship could offer. The best sole trader accountant relationships are ongoing, not annual.