Last updated: June 2026 · Reviewed by the AccountingFirms editorial team (UK qualified-accountant network)
Quick answer: A straightforward self-assessment tax return in the UK typically costs £150 to £350 when prepared by an accountant. More complex returns, such as those with rental income, capital gains or multiple income sources, usually cost £300 to £600+.
Filing a self-assessment tax return can be stressful, and getting it wrong is costly. So how much should you expect to pay an accountant to do it for you? This 2026 guide sets out realistic self-assessment accountant fees across the UK, what changes the price, and how to make sure you’re paying a fair rate.
Get in touch with our skilled professionals for expert UK tax and accounting solutions specialised to minimise your tax burden and resolve your financial challenges efficiently.
How much does an accountant charge for a self-assessment tax return?
| Type of return | Typical UK cost (2026) |
|---|---|
| Simple return (employment / one income) | 150 to 250 GBP |
| Self-employed / sole trader return | 200 to 400 GBP |
| Landlord with rental income | 250 to 500 GBP |
| Return with capital gains | 300 to 600 GBP |
| Complex / multiple income sources | 500 to 900+ GBP |
Many accountants offer a fixed price for self-assessment, so you know the cost upfront. Others bundle it into a monthly package alongside your wider accounts.
What affects the cost of your tax return?
How many income sources you have
One salary is simple. Add self-employment, dividends, rental income and foreign income, and the work, and the fee, rises.
Capital gains and investments
Selling property or shares means extra calculations and reporting, which increases the price.
How organised your records are
Tidy, categorised records keep the fee down. Disorganised paperwork takes longer and costs more.
Timing
Leaving it until January often means rush fees. Filing early usually means a calmer, cheaper experience.
Is it worth paying an accountant to file your tax return?
For many people, yes. An accountant makes sure you claim every allowable expense and relief, avoids costly mistakes, and removes the stress of HMRC deadlines. The late-filing penalty alone starts at 100 GBP, and missed reliefs often cost far more than the fee. With Making Tax Digital changing how returns work, professional help is increasingly valuable.
How to get a fair price
- Ask for a fixed quote based on your specific situation.
- Compare at least three accountants on a like-for-like basis.
- Check the fee includes filing and HMRC correspondence, not just preparation.
- File early to avoid last-minute premium charges.
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Get in touch with our skilled professionals for expert UK tax and accounting solutions specialised to minimise your tax burden and resolve your financial challenges efficiently.
Frequently asked questions
How much does an accountant charge for a self-assessment tax return?
A straightforward return usually costs 150 to 350 GBP. Returns with rental income, capital gains or multiple income sources typically cost 300 to 600+ GBP.
Is it cheaper to file my own self-assessment?
Filing yourself saves the fee, but an accountant often saves more by claiming reliefs you’d miss and avoiding penalties.
When is the self-assessment deadline?
For online returns it’s 31 January following the end of the tax year. Filing early usually means a lower, calmer fee.
What does the accountant’s fee include?
Typically preparation, submission to HMRC and basic correspondence. Always confirm what’s included before you commit.
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