- Understand typical Self Assessment tax return cost across the UK, with most accountants charging £150 to £350 for a standard return, and higher costs where income sources or structures are more complex.
- Recognise what drives pricing, including income complexity, business structure, location, and whether you need ongoing tax support in addition to filing.
- Weigh the value of professional support, as an accountant can file accurately, claim allowable expenses correctly, reduce the risk of penalties, and remove the stress of meeting HMRC deadlines.
How much do accountants charge for self assessment is one of the most common questions UK sole traders, freelancers and directors ask each tax year. Filing a return is rarely straightforward, and mistakes can lead to fines, missed allowances or unnecessary stress. So before the 31 January deadline approaches, it makes sense to understand what professional support will cost.
In 2026, how much do accountants charge for self assessment typically ranges from £150 to £350 for a standard return. However, the final fee depends on your income sources, business structure, record keeping, and whether you need additional tax advice alongside filing.
In this guide, we’ll fully explain what you can expect to pay in 2026, what those costs cover, as well as how to handle your own self-assessment tax return—whether you’re a sole trader, limited company director, or somewhere in between.
Self assessment fees at a glance
Accountant charges can vary significantly depending on your business type, income level, and required services. Here’s a typical breakdown based on UK-wide averages:
| Service | Who it’s for | Typical fee |
| Self-assessment return | Sole trader/freelancer | £150 – 300 |
| Director’s tax return | Limited company | £300 |
| Annual accounts (Ltd) | Small business, up to £100k | £400 – £700 |
| Payroll services (incl. PAYE) | Teams with up to 25 employees | £150 per month |
| Teams with up to 50 employees | £250 per month | |
| Teams with up to 100 employees | £500 per month | |
| Annual Accounts Submission | £20,000 to £30,000 | £200 – £350 |
| £100,000 to £130,000 | £450 | |
| £250,000 to £300,000 | £600 | |
| Partnership tax return | £20,000 to £30,000 | £200 – £300 |
| £100,000 to £130,000 | £500 | |
| £250,000 to £300,000 | £650 |
What determines the cost of self assessment?
1. Complexity of your income
If you only have one income source (e.g. sole employment), your return will be simple. But if you’re self-employed, a landlord, have investments, or multiple revenue streams, your accountant will need more time to prepare everything.
2. Business structure
- Sole traders often pay less due to simpler requirements
- Limited company directors usually need personal tax returns and company accounts filed
- Partnerships require a return for both the partnership and each partner individually
3. Location
London accountants as well as those found in other major cities tend to have higher fees. If you’re based in Wales or the North of England, rates are often more competitive. Many firms also offer national or remote services, which can reduce costs.
4. Level of support needed
Basic self-assessment services include preparation and filing. More advanced packages may also cover:
- Year-round bookkeeping
- VAT returns
- Tax planning
- Financial strategy reviews
In a nutshell, the more services you need, the higher the fee. (Shocking, we know.)
What small businesses should know about self assessment
If you run a small business, understanding self assessment is crucial—not just for compliance, but for better financial planning.
You’ll need to file a self-assessment tax return if you:
- Are a sole trader earning more than £1,000
- Run a partnership
- Are a director receiving untaxed income or dividends
- Have side income from property, crypto, or investments
For small businesses, accuracy matters. Over-claiming expenses could trigger an HMRC (His Majesty’s Revenue and Customs) enquiry. Under-claiming means paying more tax than you need to. A good accountant helps you find the right balance, based on your structure and income.
Top tips for small business owners:
- Keep receipts and invoices organised year-round
- Use accounting software to track income and expenses
- Understand allowable business expenses—like travel, home office use, and subscriptions
- Budget for your tax bill—don’t wait until the deadline
Why hire an accountant for self assessment?
You don’t have to hire an accountant. HMRC provides free tools to file online. But for many people, professional help brings peace of mind and tangible benefits:
- Avoid penalties by filing financial documents on time and accurately
- Claim all allowable business expenses and deductions
- Reduce the risk of HMRC missed deadlines or audits
- Save time during tax season
- Get advice on financial planning and maximise your tax efficiency
When should I file my self-assessment tax return?
The tax year runs from 6 April to 5 April, and the online filing deadline is 31 January of the following year. For example, for the tax year ending 5 April 2026, the deadline is 31 January 2027.
But leaving it to the last minute can mean:
- Limited access to accountants (they get booked up fast)
- Rushed, error-prone submissions
- Unexpected tax bills
Ideally, aim to get your paperwork to your accountant by October. This gives time for any clarifications—and if you owe tax, you’ll still have months to prepare.
Do accountants offer fixed-fee pricing?
Many do. Fixed-fee pricing is especially helpful for small businesses and sole traders who want cost certainty. Others may charge hourly rates—typically between £50–£150 an hour—for more complex returns or additional services.
If you’re comparing accountants, ask:
- What’s included in the quote?
- Does it cover the return, or also year-round support?
- Is VAT included?
What services are usually included?
A basic self-assessment package will usually include:
- Reviewing your income and expense records
- Completing your SA100 tax return
- Submitting it to HMRC on your behalf
- Explaining what’s been filed so you know what’s happening
For small businesses or higher earners, added-value services can include:
- Tax planning: Advice on how to legally reduce your tax bill through pension contributions, timing of dividends, or business structuring
- Year-round bookkeeping: Keeping your records in order throughout the year so you’re ready for deadlines and audits
- Cloud accounting setup: Access to platforms like Xero or FreeAgent, which simplify income tracking and make HMRC’s Making Tax Digital rules easier to manage
- Quarterly support: Some firms check in every few months to review your position and update projections
Even if you’re just looking for one-time help, it’s worth asking whether any tools or ongoing support are included in the fee.
How Sleek can simplify your self-assessment tax return
If you’d rather not spend hours puzzling over HMRC forms or worrying about what you can or can’t claim, Sleek can help.
Here’s what we offer:
- Fixed, transparent pricing
- Support from UK-based, qualified accountants who know the ins and outs of small business
- Simple, online processed with no hassle or surprise fees
Whether you’re a sole trader, director, or freelancer, we’ll take care of the paperwork so you can focus on running your business.
Stop struggling alone. We’re here to help.
Disclaimer: The preceding information is not legal advice. This content is aimed to provide general guidance. For more formal or legal advice, contact Sleek directly.
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