Self Assessment Tax Return — Done For You
Stop dreading the 31 January deadline. We prepare and file your self assessment tax return to HMRC — accurately, on time, and with every expense claimed that you're entitled to.
Whether you're self-employed, a landlord, a company director, or a high earner, your dedicated Clever Accounts accountant handles everything from start to finish.
What's Included
- Dedicated accountant assigned to you
- Full SA100 return preparation & filing
- All income sources covered
- Maximum expense claims reviewed
- Tax liability calculated in advance
- Payments on account managed
- HMRC correspondence handled
- Deadline reminders & year-round support
Starting from
£42.50/month
No setup fees · No minimum contract
Do You Need to File?
Who Has to Complete Self Assessment?
HMRC requires a self assessment tax return from anyone with income that isn't taxed at source through PAYE. This affects millions of UK taxpayers — and the consequences of missing the requirement can be expensive.
You must register with HMRC by 5 October following the end of the tax year in which you first need to file. If you're newly self-employed or have recently started receiving rental or investment income, don't delay.
If you're not sure whether you need to file, speak to one of our accountants — there's no obligation, and we'll give you a straight answer.
Check If You Need to FileSelf-Employed
Sole traders with trading income over £1,000 in the tax year.
High Earners
Individuals with income over £100,000, regardless of employment status.
Landlords
Anyone receiving rental income from property in the UK or abroad.
Company Directors
Directors of limited companies who receive income outside PAYE.
Foreign Income
UK residents with income from overseas sources or foreign assets.
Untaxed Income
Those with savings interest, dividends, or other untaxed income above allowances.
The Full Service
Everything Handled For You
Self assessment isn't just about filling in a form. Done properly, it means reviewing every income source, maximising legitimate expenses, calculating your liability accurately, and never missing a deadline. That's what we do.
Dedicated Accountant
Your own named accountant who knows your situation, handles your return, and is available whenever you need them.
Complete SA Return Preparation
We prepare and file your full self assessment tax return with HMRC — all pages, all supplementary forms.
All Income Sources Covered
Employment, self-employment, rental income, dividends, savings, capital gains — every source accounted for correctly.
Expense Maximisation
We review all allowable expenses and claim everything you're entitled to, reducing your tax bill legitimately.
HMRC Correspondence
We deal with HMRC on your behalf. Enquiries, letters, and compliance checks handled professionally.
Tax Calculation & Payment Reminders
We calculate exactly what you owe, including payments on account, and remind you before every deadline.
Key Dates
Self Assessment Deadlines
Missing any of these dates results in automatic penalties — even if you owe no tax. With Clever Accounts, every deadline is managed for you.
Register for Self Assessment
Deadline to register with HMRC if this is your first self assessment return. Miss this and you risk penalties before you've even filed.
Paper Return Deadline
If you want to submit a paper tax return rather than online, this is the deadline. Most people file online — it's simpler and gives you three more months.
Online Filing + Payment
The main deadline — online returns must be submitted and any tax owed must be paid. This is also when your first payment on account for the following year is due.
Second Payment on Account
If HMRC has set payments on account (advance payments toward next year's bill), the second instalment is due in July. We'll make sure you know exactly what to pay.
Penalties Are Automatic — and They Escalate Fast
A £100 immediate penalty applies the moment you miss the 31 January deadline, even if you owe nothing. After 3 months: £10/day (up to £900). After 6 months: 5% of tax owed (minimum £300). After 12 months: another 5% surcharge. Interest accrues throughout on any unpaid balance. The simplest solution is never to miss it — which is exactly what we ensure.
Avoid These Pitfalls
Common Self Assessment Mistakes
These errors cost taxpayers money every year — in penalties, in overpaid tax, and in unnecessary HMRC investigations. A dedicated accountant eliminates every one of them.
Missing Deadlines
An automatic £100 penalty applies the moment you miss the 31 January deadline, even if you owe no tax. Penalties escalate rapidly — £10/day after 3 months, then 5% surcharges on unpaid tax after 6 and 12 months.
Forgetting Expenses
Many self-employed people and landlords miss allowable expenses they're entitled to claim — home office, mileage, professional subscriptions, equipment, and more. Every missed expense means paying more tax than necessary.
Wrong Income Figures
Forgetting to include all income sources — rental income, savings interest, freelance work alongside employment, dividends — is a common error that can trigger HMRC enquiries and penalties for inaccurate returns.
Not Registering on Time
If you're newly self-employed or have a new income source requiring self assessment, you must register with HMRC by 5 October following the end of the tax year. Late registration itself carries penalties.
Client Stories
What Our Clients Say
Your Questions Answered
Self Assessment FAQs
Get Started Today
Never Miss a Tax Deadline Again
Join thousands of sole traders, landlords, and individuals who let Clever Accounts handle their self assessment. From just £42.50/month — no setup fees, no minimum contract.
Already have outstanding returns?
We can catch you up on previous years and get you fully compliant. No judgement — just solutions.