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Here's something HMRC won't tell you: most self-employed people in the UK pay more tax than they legally need to.
Not because they're dishonest — because they're busy. They miss expenses they didn't know were claimable. They don't know about reliefs that apply to their situation. They get caught off guard by a January tax bill that's far larger than expected. And they assume that managing their own tax is simpler than it actually is — until it isn't.
Going self-employed is one of the most rewarding decisions you can make professionally. But without a clear understanding of your tax obligations from day one, it's also one of the most expensive mistakes you can make financially.
This guide covers everything UK sole traders, freelancers, and self-employed professionals need to know about their tax position in 2026 — what you owe, what you can claim, what trips people up, and how the right accountant for self-employed individuals makes a measurable difference to your bottom line.
The moment you start earning money for yourself — whether as a full-time freelancer, a part-time side hustle, or a sole trader alongside employment — you become legally obligated to register with HMRC as self-employed.
The deadline is 5 October following the end of the tax year in which you started. So if you began trading in November 2025, registration was due by 5 October 2026. Miss it and you face an automatic penalty — and HMRC does not accept "I didn't know" as a reasonable excuse.
Once registered, you'll file a Self Assessment tax return every year, covering your income and expenses for the previous tax year. This applies even in years when your profit falls below the tax-free Personal Allowance — the return itself is still required.
If you work in construction, your obligations may include the Construction Industry Scheme (CIS), which involves deductions taken at source by contractors. CIS returns are separate from standard Self Assessment and require specialist handling to ensure you're not overpaying — or underpaying.
As a sole trader, your taxable profits are subject to two charges: Income Tax and Class 4 National Insurance Contributions.
| Band | Taxable Income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic Rate | £12,571 – £50,270 | 20% |
| Higher Rate | £50,271 – £125,140 | 40% |
| Additional Rate | Above £125,140 | 45% |
Note: the Personal Allowance reduces by £1 for every £2 earned above £100,000, disappearing entirely at £125,140.
Real example: A freelance graphic designer with £38,000 profit in 2025/26 would pay:
That figure changes significantly based on expenses claimed, pension contributions made, and any other income sources. An accountant for self-employed individuals ensures the calculation reflects your actual position — not a rough estimate.
Your taxable profit is turnover minus allowable expenses. Every pound of legitimate expenses you miss is a pound of profit you're paying tax on unnecessarily.
Office and Equipment Stationery, printer ink, postage, computer equipment, office furniture used exclusively for business, and software subscriptions used for work.
Travel Business mileage in your own vehicle (45p per mile for the first 10,000 miles, 25p thereafter), rail and bus fares for business trips, parking costs. Commuting to a regular place of work is not claimable — but travel to client sites, meetings, and other business locations is.
Marketing and Advertising Website design, hosting, domain fees, social media advertising, flyers, business cards, and any paid promotion directly related to your business.
Professional Fees Accountancy fees, legal costs directly related to the business, professional indemnity insurance, and membership fees for industry bodies relevant to your work.
Phone and Internet The proportion of your phone and broadband bills used for business. If your phone is 60% business use, 60% of the cost is claimable.
Home Office If you work from home, you can claim either a proportion of household costs (utilities, broadband, rent/mortgage interest) based on the proportion of your home used for work, or the flat rate of £6 per week without needing to keep receipts.
Training and Development Courses, books, and subscriptions that develop skills you already use in your current work. Retraining for a completely different career does not qualify.
The Trading Allowance If your gross self-employment income is £1,000 or less in a tax year, you don't need to declare it. Above that, the full Self Assessment process applies.
Different professions have different claimable expenses. Freelancers and content creators, personal trainers, Uber and taxi drivers, tradespeople, and teachers and tutors all have sector-specific expenses that a generalist might miss. Our accounting and bookkeeping service ensures nothing legitimate is left on the table.
Unlike employment, tax isn't deducted at source. Many sole traders spend their income as it arrives, then face a painful January reckoning. A practical rule: set aside 25–30% of every payment received into a separate account and don't touch it.
If your tax bill exceeds £1,000, HMRC requires advance payments toward the following year's tax — called Payments on Account. These are due:
In your first year of significant income, you can face a bill of up to 150% of what you expected — your actual tax plus the first Payment on Account, all due in January. Many first-time filers are caught completely unprepared. Our tax advisory team calculates this well in advance so you're never surprised.
HMRC can request receipts and records going back up to 6 years. Claiming expenses you can't evidence is risky. If you're subject to an HMRC tax investigation, having clean, organised records is the difference between a quick closure and a lengthy, costly process.
Not everyone who files a Self Assessment return owes tax — sometimes HMRC owes you. Overpaid tax through PAYE employment, allowable losses from a previous year, or relief on pension contributions can all generate a tax refund that many people never claim simply because they didn't know it was available.
Beyond a certain profit level — typically around £30,000–£40,000 — operating through a limited company can be significantly more tax efficient than sole trader status. Corporation Tax rates are lower than higher-rate Income Tax, and directors can extract profits through a combination of salary and dividends to minimise NICs. If you haven't reviewed this recently, company formation services from Hayes include a full tax comparison before any decision is made.
If your taxable turnover exceeds £90,000 in any rolling 12-month period, VAT registration is mandatory — and the clock starts the moment you cross the line, not at year-end. You must register within 30 days of breaching the threshold.
Many self-employed professionals also register voluntarily below the threshold, particularly if their clients are VAT-registered businesses who can reclaim input VAT. Voluntary registration means you can also reclaim VAT on your own business purchases.
VAT return services from Hayes cover registration, scheme selection (standard, flat rate, or cash accounting), and all quarterly return preparation and submission.
Making Tax Digital for Income Tax is already live for self-employed individuals with qualifying income above £50,000, and the threshold drops to £30,000 in April 2027 and £20,000 in April 2028. This will eventually bring the vast majority of sole traders into mandatory quarterly digital filing with HMRC.
Under MTD, annual Self Assessment returns are replaced by four quarterly updates plus a year-end Final Declaration, all submitted through HMRC-recognised software. Our complete Making Tax Digital service handles every step — from checking whether you're in scope to submitting all quarterly updates on your behalf.
How much does self-employed accounting actually cost? Hayes provides accountants for self-employed individuals from just £20 per month — covering your dedicated accountant, tax return preparation and submission, bookkeeping reminders, and unlimited help and advice. For most sole traders, the tax savings identified more than cover the monthly fee many times over.
Do I need an accountant if I earn a small amount self-employed? Even lower earners benefit from an accountant ensuring all allowable expenses are claimed and the return is filed correctly. Errors or omissions on a Self Assessment return — even minor ones — can attract HMRC attention. The cost of getting it wrong typically far exceeds the cost of getting it right from the start.
What if I'm both employed and self-employed? This is one of the most common situations we handle. Your Self Assessment return covers all your income — employment income (which has already had PAYE deducted), plus your self-employment profit. The interaction between the two affects your overall tax liability and which band your self-employment income is taxed at.
What if HMRC investigates me? HMRC can open a compliance check on anyone at any time — sometimes randomly, sometimes triggered by inconsistencies. Hayes provides HMRC tax investigation support, handling all correspondence and representation on your behalf so the process doesn't disrupt your business.
I think I've overpaid tax in previous years — can I claim it back? Yes — up to 4 years of overpaid tax can usually be reclaimed. Our tax rebate and refund service identifies overpayments and manages the reclaim process with HMRC.
At Hayes, we are more than just accountants — we are your gateway to financial clarity and success. For self-employed professionals across the UK, that means one ACCA-certified team, one fixed monthly fee from £20, and a full service that covers everything from registration to HMRC representation.
We work with sole traders across every industry — from electricians and plumbers to barbers, contractors, freelancers, and startup founders — understanding that each profession has its own expense profile, its own risks, and its own opportunities to reduce the tax bill.
What's included:
Book your free 15-minute consultation with Hayes →
📞 020 8646 0800 | 💬 WhatsApp: 07429 584 191 | 📧 info@hayes-accountants.co.uk 🏢 Aquis House, 27-37 Station Road, Hayes, UB3 4DX, London