For UK self-employed workers, choosing between a sole trader and a limited company affects your tax bill, legal liability, and administrative burden. For profits below £30,000/year, sole trader is usually simpler. For profits above £35,000, a limited company typically saves thousands of pounds in tax each year.
Key Differences at a Glance
| Factor | Sole Trader | Limited Company |
|---|---|---|
| Tax on profits | Income Tax + Class 4 NI | Corporation Tax (25%) + dividend tax |
| Personal liability | Unlimited | Limited to share capital |
| Privacy | Full name on HMRC records | Accounts filed at Companies House (public) |
| Admin | Simple — one Self Assessment | Annual accounts, confirmation statement, payroll |
| Accountant cost | £300-£600/year | £800-£1,500/year |
| Best for income | Under £30,000 net profit | Over £30,000-£35,000 net profit |
| Pension | Self-employed pension (SIPP) | Employer pension contributions (corporation tax deductible) |
| Expenses | Allowable business expenses | Allowable business expenses + director benefits |
Sole Trader: How Tax Works
As a sole trader, all profit is your personal income. You pay:
- Income Tax on profits above the personal allowance (£12,570 in 2026/27)
- Class 4 NI: 6% on profits from £12,570 to £50,270; 2% above £50,270
Worked example — £40,000 profit (sole trader):
| Amount | |
|---|---|
| Total profit | £40,000 |
| Personal allowance | −£12,570 |
| Taxable income | £27,430 |
| Income Tax (20%) | £5,486 |
| Class 4 NI (6%) on £27,430 | £1,646 |
| Total tax and NI | £7,132 |
| Net take-home | £32,868 |
Limited Company: How Tax Works
As a limited company director, you structure income as a low salary + dividends:
- Company pays Corporation Tax of 25% on profits above £50,000 (19% for profits under £50,000)
- You take a salary up to the NI threshold (£12,570) — no Income Tax or NI
- Remaining profit (after Corp Tax) is distributed as dividends
- Dividends attract lower tax rates: 0% (£500 allowance), 8.75% (basic), 33.75% (higher)
Worked example — £40,000 profit (limited company):
| Amount | |
|---|---|
| Company profit | £40,000 |
| Director salary | −£12,570 |
| Taxable company profit | £27,430 |
| Corporation Tax (19%) | −£5,212 |
| Available for dividend | £22,218 |
| Dividend allowance | −£500 |
| Dividend tax (8.75%) | £1,912 |
| Director salary take-home (after £0 income tax) | £12,570 |
| Dividend received | £22,218 |
| Total take-home | £34,788 |
| Total tax paid (CT + dividend) | £7,124 |
On £40,000, the limited company saves approximately £1,900 net — but accountant fees of £800-£1,500 may reduce or eliminate the benefit.
Tax Comparison Across Income Levels
| Annual Profit | Sole Trader Net | Ltd Company Net | Ltd Saving |
|---|---|---|---|
| £20,000 | £17,400 | £17,200 | −£200 (ltd worse) |
| £30,000 | £24,300 | £25,400 | +£1,100 |
| £50,000 | £37,500 | £41,200 | +£3,700 |
| £80,000 | £54,200 | £62,500 | +£8,300 |
| £100,000 | £63,000 | £75,000 | +£12,000 |
Figures approximate for 2026/27. Assumes all profit extracted. Higher savings at higher incomes from retaining profit in company at Corp Tax rates.
Liability: A Key Non-Tax Factor
Sole trader: Your business and personal finances are legally the same. If a client sues you for a £50,000 error and you cannot pay, your personal savings, home equity, and assets are at risk.
Limited company: The company is a separate legal entity. In most circumstances, your personal liability is limited to the amount you invested in shares — often £1. Creditors cannot pursue your personal assets (exceptions: personal guarantees, fraud, wrongful trading).
For consultants, tradespeople, and professionals working in sectors with any litigation risk, limited liability is a strong non-tax reason to incorporate.
Administrative Burden Comparison
Sole trader requirements:
- Register with HMRC as self-employed
- File one Self Assessment tax return per year
- Keep records of income and expenses
- Pay Class 4 NI and Income Tax twice yearly (January and July)
- VAT registration if turnover exceeds £90,000 (2026 threshold)
Limited company requirements:
- Register with Companies House (one-off, ~£50 online)
- Run payroll (usually monthly) for director salary
- File annual accounts with Companies House (within 9 months of year end)
- File Corporation Tax return with HMRC (within 12 months)
- File confirmation statement annually (£34/year online)
- Directors file personal Self Assessment tax returns
- VAT registration if turnover exceeds £90,000
The additional admin of a limited company typically costs £800-£1,500/year in accountancy fees versus £300-£600/year for sole trader.
When to Stay as a Sole Trader
- Your net profit is under £25,000-£30,000/year
- You want minimal admin and paperwork
- Your work carries very little liability risk
- You are just starting out and not sure how long the business will continue
- You plan to go back into employment soon
When to Switch to a Limited Company
- Your net profit consistently exceeds £30,000-£35,000/year
- You want to protect personal assets from business liability
- Your clients or sector require you to operate via a limited company
- You want to retain profits in the company and invest them (Corp Tax at 19-25% is lower than higher-rate Income Tax at 40%)
- You want to make employer pension contributions (deductible from company profits)
- You are considering IR35 — most contractors must operate via a PSC
Contractor Note: IR35 and Limited Companies
If you are a contractor working through a personal service company (PSC), your income from contracts may be subject to IR35 rules. Being inside IR35 removes most of the tax benefits of operating via a limited company for that contract. See the IR35 guide for full details.
How to Switch from Sole Trader to Limited Company
- Incorporate your limited company at Companies House (online at gov.uk, ~£50)
- Notify HMRC that you have ceased self-employment as a sole trader
- Transfer business assets to the company (specialist advice needed for property or IP)
- Open a business bank account in the company name
- Register for payroll (PAYE) with HMRC
- Register for VAT if required
- Appoint an accountant — the admin step-up is significant
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The content on Wealthvieu is for informational purposes only and should not be considered financial, tax, or investment advice. Consult a qualified professional before making financial decisions. Full disclaimer · Editorial policy