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Self Assessment Tax Return Accountant
Your tax return prepared, checked and filed with HMRC, for a fixed fee
We prepare your Self Assessment tax return, claim every allowance and expense you're entitled to, file it online with HMRC and tell you exactly what to pay and when. No hourly rates and no surprises.
- Filed before 31 January
- Every expense claimed
- Payments on account explained
- Fixed fee, agreed first
Get your Self Assessment fixed fee
Free, no obligation. We usually reply the same working day.
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How much will your Self Assessment tax return cost?
Tap everything that applies to you this tax year. Your fixed price updates instantly.
£180 including VAT
One-off fee for one tax year. Confirmed in writing before we start.
In short
What is a Self Assessment tax return?
A Self Assessment tax return is how you tell HMRC about income that hasn't been taxed automatically, such as self-employment, rental, dividend or foreign income. You file it online by 31 January after the end of the tax year, which runs from 6 April to 5 April, and pay any tax owed by the same date. An accountant prepares the return, claims your allowances and expenses, and files it for you.
- Tax year6 April to 5 April
- Online deadline31 January 2027 for 2025/26
- Late filing£100 automatic penalty
- Our feeFrom £150 + VAT, fixed
Who needs to file a Self Assessment tax return?
You usually need to file a Self Assessment tax return for a tax year if any of these apply to you.
- Self-employed with gross income over £1,000
- A partner in a business partnership
- A landlord with rental income above the £1,000 property allowance
- Untaxed income, such as tips or commission, over £2,500
- Capital gains to report, including disposals over £50,000
- The High Income Child Benefit Charge to pay
- Foreign income that's taxable in the UK
- A notice to file from HMRC, even if you think you owe nothing
Not sure? Use HMRC's tax return checker, or ask us and we'll confirm for free.
Self Assessment deadlines for the 2025/26 tax year
Miss a deadline and HMRC charges penalties automatically. These are the dates that matter.
- OCT5 October 2026Register for Self Assessment if it's your first return
- OCT31 October 2026Deadline for paper tax returns
- JAN31 January 2027File online, pay the balance and your first payment on account
- JUL31 July 2027Second payment on account due
days until the online deadline. Send us your records at least 60 days before 31 January and your return is filed in good time, with no last-minute rush.
What's included in our Self Assessment tax return service
Everything needed to file an accurate return and keep you on the right side of HMRC.
- Registering you for Self Assessment and getting your UTR
- Authorising us as your agent with HMRC
- Preparing your return from your records and documents
- Claiming every allowable expense and relief
- Pension contributions and Gift Aid tax relief
- Checking your tax code and any refund due
- Calculating your tax and payments on account
- Your approval before anything is filed
- Filing online with HMRC and confirmation of receipt
- A clear summary of what to pay and when
- Answering HMRC letters about your return
- Unlimited questions by phone, email and video
How we file your Self Assessment tax return
Four simple steps, all online.
Get your fixed fee
Tell us about your income and we confirm your price in writing before we start.
Send your records securely
Upload documents online or forward them by email. We tell you exactly what we need.
We prepare your tax return
We prepare and check your Self Assessment, then send it to you to approve.
We file your Self Assessment with HMRC
We file online, confirm HMRC has received it and tell you what to pay and when.
Documents you need for your Self Assessment tax return
Use this checklist to gather your records. We'll tell you if anything else is needed.
About you
- Your UTR and National Insurance number
- Your HMRC online account, if you have one
- Details of any student loan
Your income
- P60, P45 and P11D from employers
- Pension statements
- Bank interest and dividend statements
- Business sales or rental statements
- Foreign income details
Costs and reliefs
- Business or property expenses
- Mileage records
- Mortgage interest statements
- Pension contributions and Gift Aid
- Sale and purchase details of any assets sold
Self Assessment penalties and how to avoid them
HMRC charges penalties for filing late and paying late, and they add up quickly.
| How late | Late filing penalty | Late payment penalty |
|---|---|---|
| 1 day | £100, even if no tax is due | Interest starts on unpaid tax |
| 30 days | No extra filing penalty | 5% of tax unpaid |
| 3 months | £10 a day for up to 90 days, maximum £900 | Interest continues |
| 6 months | £300 or 5% of the tax due, whichever is higher | A further 5% of tax unpaid |
| 12 months | A further £300 or 5% of the tax due, whichever is higher | A further 5% of tax unpaid |
Already received a penalty? If you had a reasonable excuse, such as serious illness, we can appeal it for you for £99 plus VAT. If you're in Making Tax Digital, a points-based penalty system applies to late quarterly updates.
Source: GOV.UK Self Assessment penalties.
Self Assessment tax return prices
Fixed fees, agreed in writing before we start. Prices exclude VAT.
Standard tax return
Jobs, pensions, benefits in kind, work expenses, pension and Gift Aid relief.
See what's includedSole trader tax return
Business accounts and your tax return, with every allowable expense claimed.
Check my exact priceLandlord tax return
One rental property, with £50 for each additional property.
Add other incomePrefer support all year? Monthly packages including your tax return start from £30 a month plus VAT. Compare monthly packages.
Using an accountant vs filing your own Self Assessment
You can file your own tax return, but an accountant usually saves more than they cost.
| Filing it yourself | With Fixed Fee Accountant | |
|---|---|---|
| Expenses and reliefs | Easy to miss what you can claim | Every allowable expense and relief checked |
| Accuracy | Mistakes can lead to penalties and enquiries | Prepared and checked by qualified accountants |
| Deadlines | You track every date yourself | We remind you and file in good time |
| HMRC letters | You deal with HMRC alone | We deal with HMRC for you |
| Cost | Your time | From £150 + VAT, fixed |
Self Assessment help for every situation
Every tax return is different. Choose your situation to see how we help.
Sole traders and the self-employed
Business accounts and your Self Assessment tax return in one, with every allowable expense claimed.
Self Assessment for sole traders →Landlords
Rental income, mortgage interest relief and property expenses reported correctly on your return.
Self Assessment for landlords →Employed people with other income
Side income, dividends, foreign income or the Child Benefit charge added to your salary.
Self Assessment for employed people with other income →Company directors
Salary, dividends and benefits in kind brought together on your personal tax return.
Self Assessment for company directors →Partners
Your share of partnership profit reported on your own Self Assessment, alongside the partnership return.
Self Assessment for partners →Non-residents and expats
UK income while living abroad, the residence pages and any double taxation relief.
Self Assessment for non-residents →Making Tax Digital and your tax return
Sole traders and landlords with qualifying income over £50,000 now send quarterly updates and a final declaration instead of a Self Assessment tax return. We handle both.
Fixed fee Self Assessment accountant
As a fixed fee Self Assessment accountant, we agree your price before we start. Questions, HMRC letters and reminders are included, so your fee never changes because you needed help.
- Price agreed in writing first
- No hourly rates
- No charge for questions
Online Self Assessment accountant
As an online Self Assessment accountant, we work with clients across the UK by phone, email and video, including evenings and Saturdays. Send documents from your phone and approve your return online.
- Secure online document upload
- Evenings and Saturdays
- Support anywhere in the UK
Self Assessment tax return FAQs
When is the Self Assessment tax return deadline?
The online deadline is 31 January after the end of the tax year. For the 2025/26 tax year, which ended on 5 April 2026, you must file online and pay any tax owed by 31 January 2027. Paper returns are due by 31 October.
Who needs to file a Self Assessment tax return?
You usually need to file if you're self-employed with income over £1,000, a partner in a partnership, a landlord, have untaxed income, owe the High Income Child Benefit Charge, have capital gains to report, or HMRC has sent you a notice to file. HMRC's online checker can confirm whether you need to.
How much does an accountant charge for a Self Assessment tax return?
Our Self Assessment tax return starts at £150 plus VAT for employment or pension income. A sole trader return is £199 and a return with one rental property is £250, both plus VAT. Year-round support starts at £30 a month.
What happens if I miss the Self Assessment deadline?
HMRC charges an automatic £100 penalty the day after the deadline, even if you owe no tax. Further penalties apply after 3, 6 and 12 months, and interest is charged on unpaid tax. Filing as soon as possible limits the penalties.
Can you file late or past Self Assessment tax returns?
Yes. We bring earlier years up to date and can appeal penalties where you have a reasonable excuse. Catch-up work starts from £199 plus VAT per year, and an HMRC penalty appeal is £99 plus VAT.
What are payments on account?
If your last tax bill was over £1,000, HMRC usually asks for two advance payments towards next year's bill, due on 31 January and 31 July. Each is half of the previous year's bill. We show you exactly what to pay and when, and can reduce them if your income falls.
Do I need a UTR number to file a Self Assessment tax return?
Yes. Your Unique Taxpayer Reference is issued when you register for Self Assessment. If you don't have one, we can register you with HMRC. You must register by 5 October after the end of the tax year in which you first need to file.
Does Making Tax Digital replace the Self Assessment tax return?
For sole traders and landlords with qualifying income over £50,000, Making Tax Digital for Income Tax replaces the annual return with quarterly updates and a final declaration. Everyone else continues to file a Self Assessment tax return.
What expenses can I claim on my tax return?
Self-employed people can claim allowable business costs such as stock, travel, phone and software. Employees can claim work expenses they pay themselves, and everyone can claim relief on personal pension contributions and Gift Aid. We check every claim you're entitled to.
How long does it take to prepare a Self Assessment tax return?
Most returns are ready within 10 working days of receiving complete records. We send your return to you for approval before filing, and confirm once HMRC has accepted it.
Get your Self Assessment tax return filed
Tell us about your income and we'll confirm your fixed fee, usually the same working day.