Self Assessment Tax Returns for Sole Traders Fixed-Fee London Accountant - MTD Ready
Fixed-fee, HMRC-compliant self assessment tax returns for sole traders and the self-employed. From £350. No surprises. Avoid the January panic.
ICAEW Chartered Accountant Regulated & Qualified
HMRC Registered Agent Authorised to act on your behalf
Sage QuickBooks Xero All major platforms supported
East & South London Offices Local accountant, national reach
In Person & Online Meet us or work remotely
THE SERVICE
Expert sole trader accountant — accurate, on time, and stress-free
As a sole trader, your Self Assessment tax return is one of your most important annual obligations. Get it wrong and HMRC may charge penalties, interest, or request an enquiry. With the right accountant, you may find legitimate savings you didn't know existed.
Circular3 handles Self Assessment returns for sole traders across all industries — from freelancers and consultants to tradespeople and e-commerce sellers. Our chartered accountants ensure your return is filed accurately, on time, and with every allowable business expense claimed. We quote a fixed fee upfront, based on your income and complexity. No hidden charges.
What This Service Does for You
What This Service Enables You to Do
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Meet your HMRC deadline with confidence
31 January deadline for online returns — filed on your behalf via HMRC agent credentials
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Claim every allowable business expense
From mileage and home office to equipment and professional subscriptions — everything is checked
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Know your tax bill in advance
Your liability & payments on account are calculated so you can plan your cash flow — no January shocks
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Avoid late filing penalties
There is a £100 automatic penalty for late filing — the deadline is never missed
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Prepare for Making Tax Digital (MTD)
MTD ITSA applies from April 2026 for sole traders earning over £50k — get ready now
Who Needs to File a Self Assessment Tax Return
Do I Need to File a Self Assessment as a Sole Trader?
Freelancer, taxi driver, gig worker, tradesperson, consultant, side hustler — it doesn't matter what you call it.
Whether you're a freelance consultant logging hours on a laptop, a craftsperson running a workshop, a self-employed professional managing a full client list, or just running a side hustle — your Self Assessment return has the same hard deadline and the same potential penalties.
Circular3 works with sole traders across every industry and income level. The pricing structure supports people at all income levels and supports you to do as much as you are comfortable with. Your chartered accountant can do more than file — they can check, optimise, and advise.
What's Included
What's Included in Your Sole Trader Self Assessment Tax Return
Everything below is covered in your fixed fee — fully managed by your ICAEW Chartered Accountant.
Your Tax Return, Filed for You
Accurate preparation and direct HMRC submission — with full confirmation once accepted.
- SA100 & SA103 preparation
- Tax computation
- National Insurance (Class 2 & 4)
- HMRC filing & confirmation
- Deadline & payment reminders
All Income & Reliefs Covered
Every income source declared, every relief claimed — so you never pay more tax than necessary.
- Bank & savings interest, UK dividends
- Pension income & higher rate relief
- Gift Aid & charitable giving
- Student loan repayment calculation
Advice & Peace of Mind
Your return explained in plain English — and practical guidance to stay on top of things year-round.
- Clear explanation of what you owe and why
- Payments on account calculation
- Digital record keeping guidance
- MTD readiness advice
Transparent Fixed-Fee Pricing
How Much Does a Sole Trader Self Assessment Cost?
Fees shown are estimates based on your income band, the timetable and the complexity of the work. A fixed fee estimate will be agreed with you before any work begins.
| Record Complexity | What this means | Total Fee |
|---|---|---|
| Simple | Cloud accounting + bookkeeper/automation + <50 transactions/yr | £375£450 incl. VAT |
| Moderate | Spreadsheet records + owner-maintained + 50–250 transactions/yr | £450£540 incl. VAT |
| Complex | Raw data / paper + not maintained + 250–1,000 transactions/yr | £575£690 incl. VAT |
| Highly Complex | Full reconstruction needed + 1,000+ transactions/yr | £725£870 incl. VAT |
| Record Complexity | What this means | Total Fee |
|---|---|---|
| Simple | Cloud accounting + bookkeeper/automation + <50 transactions/yr | £425£510 incl. VAT |
| Moderate | Spreadsheet records + owner-maintained + 50–250 transactions/yr | £525£630 incl. VAT |
| Complex | Raw data / paper + not maintained + 250–1,000 transactions/yr | £650£780 incl. VAT |
| Highly Complex | Full reconstruction needed + 1,000+ transactions/yr | £825£990 incl. VAT |
| Record Complexity | What this means | Total Fee |
|---|---|---|
| Simple | Cloud accounting + bookkeeper/automation + <50 transactions/yr | £500£600 incl. VAT |
| Moderate | Spreadsheet records + owner-maintained + 50–250 transactions/yr | £625£750 incl. VAT |
| Complex | Raw data / paper + not maintained + 250–1,000 transactions/yr | £775£930 incl. VAT |
| Highly Complex | Full reconstruction needed + 1,000+ transactions/yr | £950£1,140 incl. VAT |
| Record Complexity | What this means | Total Fee |
|---|---|---|
| Simple | Cloud accounting + bookkeeper/automation + <50 transactions/yr | £575£690 incl. VAT |
| Moderate | Spreadsheet records + owner-maintained + 50–250 transactions/yr | £725£870 incl. VAT |
| Complex | Raw data / paper + not maintained + 250–1,000 transactions/yr | £900£1,080 incl. VAT |
| Highly Complex | Full reconstruction needed + 1,000+ transactions/yr | £1,100£1,320 incl. VAT |
The fee quoted is an estimate based on the timetable, provision of information and scope of work assumptions. Should these assumptions turn out to be incorrect, Circular3 reserves the right to notify you of a revised figure or range and seek your agreement to the change, before continuing. VAT charged at 20%. Fees shown are for sole trader Self Assessment — additional income sources such as property, capital gains or foreign income are quoted separately.
Optional Add-Ons
Additional Services — Quoted Separately
The following are not included in the standard fee and are only added if needed, based on your individual circumstances. Each is quoted and agreed before any work begins.
Reconciliation
Self-Employment
Capital Gains Tax
Other Add-Ons
Turnaround Time
All add-on fees are estimates and will be confirmed before work begins. Add-ons are only included if required — you will not be charged for anything not agreed in advance. All fees exclude VAT at 20%.