How Much Does a Sole Trader Accountant Cost in the UK? (2026)
September 12, 2026
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A sole trader accountant in the UK typically costs £150 to £400 for a one-off self assessment return or £25 to £100 per month for an ongoing package that includes bookkeeping, annual accounts, and tax filing. Full-service arrangements with VAT returns and year-round advice can reach £1,200 to £1,500 per year.
That’s a wide range. The price you actually pay depends on how complex your finances are, how organized your records are, and what level of support you need. A freelance photographer with one bank account and 20 invoices is a very different job from a contractor with multiple income streams, subcontractors, and construction industry scheme deductions.
Tax Return Assist offers fixed-fee sole trader packages with no surprise bills. You can get an instant quote based on your specific situation, or keep reading to understand what the market charges and what you should expect for your money.
This covers the preparation and filing of your annual self assessment tax return. You provide your income and expense records. The accountant reviews them, prepares the return, files it with HMRC, and tells you how much you owe. It doesn’t include bookkeeping, ongoing advice, or help with anything during the year. This suits sole traders with simple finances who keep their own records and just need the return filed correctly.
A step up. The accountant prepares formal annual accounts (profit and loss statement, balance sheet) as well as the tax return. This gives you a clearer picture of your business performance and is often required if you’re applying for a mortgage or business loan. Some accountants include a year-end review where they look for tax-saving opportunities before filing.
This is the most popular arrangement for sole traders who want ongoing support. The accountant handles your bookkeeping throughout the year (categorizing transactions, reconciling bank statements, chasing missing receipts), prepares your annual accounts, and files your self-assessment return. Most monthly packages also include unlimited email support so you can ask tax questions as they come up rather than waiting until January.
If you’re VAT-registered or required to comply with Making Tax Digital for Income Tax (qualifying income from self-employment and/or property above £50,000 from April 2026), you’ll need quarterly submissions. This adds to the workload. Full-service packages cover bookkeeping, quarterly VAT or MTD returns, annual accounts, self-assessment, and ongoing tax advice.
The quality of your records: This is the biggest price driver. If you hand your accountant a neatly organized spreadsheet or a connected Xero account, the work takes an hour. If you hand them a carrier bag of receipts and 12 months of unsorted bank statements, it takes 5 hours. Some accountants charge extra for “records preparation” (which is accountant-speak for sorting out your mess). Others just quote a higher fixed fee. Either way, you’re paying for the time.
Complexity of your income: One self-employment income with a few expenses is straightforward. Add rental income, capital gains, foreign income, dividends, CIS deductions, or a mix of employment and self-employment, and the return gets more complicated. Each additional section takes more time and more expertise.
Number of transactions: A sole trader with 50 transactions per year costs less to service than one with 500. If you’re selling products online with hundreds of small transactions, the bookkeeping workload is much higher than a consultant who sends 12 invoices a year.
Location: Central London firms typically charge 20% to 30% more than accountants in the rest of the UK. Online accountants (who serve clients anywhere) tend to be priced closer to the national average. Tax Return Assist serves clients across Essex and London at fixed fees that don’t vary by postcode.
Filing near the deadline: Some accountants charge rush fees for returns submitted in the last few weeks before 31 January. If you give your accountant your records in December, expecting a January filing, expect to pay more. Hand them everything in May and you’re a more profitable, less stressful client. They may price accordingly.
VAT registration: If your turnover exceeds £90,000 (or you’ve registered voluntarily), quarterly VAT returns add £300 to £600 per year to the bill, depending on the volume of transactions.
Fixed fees, not hourly rates: Hourly billing creates uncertainty. You don’t know what the final bill will be until the work is done. Fixed fees mean you know exactly what you’re paying before the accountant starts. Most good sole trader accountants have moved to fixed-fee pricing.
Clear scope of service: Know exactly what’s included. Does the fee cover just the tax return or bookkeeping too? Does it include email support during the year? What about payroll if you hire someone? What about HMRC enquiries? Ask before you sign up, not when the extra invoice arrives.
Response time: A cheap accountant who takes 2 weeks to reply to an email is more expensive than a slightly pricier one who responds in 24 hours. When HMRC sends you a letter or you need to make a financial decision, waiting 2 weeks isn’t an option.
Qualifications and HMRC registration: Make sure your accountant is a member of a recognized professional body (ICAEW, ACCA, AAT, CIOT) and is registered with HMRC as an agent. Anyone can call themselves an accountant in the UK. That doesn’t mean anyone should file your tax return.
Industry understanding: An accountant who works with sole traders and small businesses regularly will know the common expenses, the typical traps, and the reliefs that apply to your situation. A specialist self-employed accountant is generally a better fit than a generalist firm that mainly handles large limited companies.
If your finances are genuinely simple (one income source, a few expenses, no property or investments), you can file your own return. HMRC’s online system is designed for this. Your cost: £0 plus your time.
An accountant becomes worth the fee when:
You’re spending more than 2 to 3 hours on your return, and the accountant’s fee is less than your hourly rate. You’re not confident you’re claiming all your allowable expenses (most sole traders under-claim by £500 to £2,000 per year). You’ve had a compliance check or an HMRC enquiry and want professional representation. You want to focus on earning money rather than doing tax admin. You’re approaching the VAT threshold or the MTD threshold and need guidance on what’s coming.
For most sole traders earning over £20,000, the tax savings from professional expense review cover the accountant’s fee. Our guide to allowable sole trader expenses lists everything you can claim. If you’re missing even a few of those categories, an accountant will find them.
Online accountants typically charge 20% to 40% less than high-street firms because they don’t carry office rental costs. Communication happens through email, video calls, and shared accounting software. Your records live in the cloud, not in a filing cabinet on the high street.
For most sole traders, online works perfectly. You don’t need face-to-face meetings to file a tax return. You need someone who responds quickly, understands your business, and files accurately.
That said, some people prefer a local accountant they can visit in person. If having a face across a desk matters to you, that’s a valid preference. Just expect to pay more for the office space you’re sitting in.
Tax Return Assist offers the best of both: a dedicated accountant who handles everything remotely, with local presence across Grays, Essex and London for clients who want to meet in person.
The cheapest option isn’t always the worst, but these warning signs should make you cautious:
No clear qualifications or professional body membership. No fixed-fee quote (just “we’ll see how much work it is”). Takes weeks to respond to emails. Files your return without reviewing it with you first. Doesn’t ask about your expenses (a sign they’re not looking for deductions). Charges extra for every question you ask during the year.
An accountant who costs £150 and misses £800 in claimable expenses has cost you £950. An accountant who costs £400 and catches everything has saved you money. The fee is only one half of the equation.
Tax Return Assist provides fixed-fee sole trader accounting packages with no hidden charges. Self-employed accountant services include HMRC registration, bookkeeping, self assessment filing, and year-round support. Small business accountant packages cover everything from startup to ongoing compliance.
Call 02039377911, email contact@taxreturnassist.co.uk or use the online quote form. You’ll get a clear price for exactly what you need, with no obligation.
Disclaimer: This article is for general information purposes only and does not constitute professional financial, tax, or legal advice. Tax rules and rates can change, and individual circumstances can affect the amount of tax payable. Always check the latest HMRC guidance or speak to a qualified accountant or tax adviser before making tax decisions. Tax Return Assist accepts no liability for actions taken based on the information contained in this article.
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