Choosing between sole trader and limited company is one of the most consequential financial decisions a self-employed person faces. The limited company structure is more tax-efficient at higher profit levels — but comes with meaningfully more administration and legal responsibility. Here is a structured guide to help you decide.
How Each Structure Is Taxed
Sole trader: All business profits are added to your income and taxed through Self Assessment. You also pay Class 4 National Insurance on profits above £12,570 (9% up to £50,270, 2% above) and Class 2 NI (£3.45/week) if profits exceed £12,570.
Limited company: The company pays Corporation Tax on its profits (25% on profits above £50,000, 19% on profits below £50,000). You then draw money from the company — typically a low salary plus dividends — paying personal tax only on what you extract.
2025/26 Tax Rates
| Tax | Rate |
|---|---|
| Income tax — basic rate | 20% |
| Income tax — higher rate | 40% |
| Income tax — additional rate | 45% |
| Class 4 NI (£12,570–£50,270) | 9% |
| Class 4 NI (above £50,270) | 2% |
| Corporation Tax (up to £50,000) | 19% |
| Corporation Tax (£50,001–£250,000) | Marginal relief applies |
| Corporation Tax (above £250,000) | 25% |
| Dividend allowance | £500 |
| Dividend tax — basic rate | 8.75% |
| Dividend tax — higher rate | 33.75% |
| Dividend tax — additional rate | 39.35% |
Worked Example: £40,000 Profit
Sole trader
- Profits: £40,000
- Income tax: £40,000 - £12,570 = £27,430 × 20% = £5,486
- Class 4 NI: (£40,000 - £12,570) × 9% = £2,469
- Class 2 NI: £3.45 × 52 = £179
- Total tax + NI: £8,134
- Take-home: £31,866
Limited company (£12,570 salary + dividends)
- Salary: £12,570 (at Personal Allowance — no income tax or employee NI; employer NI on £12,570 - £5,000 = £7,570 × 15% = £1,136 but deductible)
- Remaining to draw as dividends: £40,000 - £12,570 salary cost - £1,136 employer NI = £26,294 remaining profit
- Corporation Tax (19%): £26,294 × 19% = £4,996
- Post-tax profit: £21,298 available as dividends
- Dividend income: £21,298 — first £500 free, remainder £20,798 × 8.75% = £1,820 dividend tax
- Total taxes paid (CT + dividend): ~£7,952
- Take-home equivalent: ~£32,048
At £40,000 the difference is modest — approximately £182 in the company’s favour. The administrative overhead may outweigh this saving.
Worked Example: £70,000 Profit
Sole trader
- Income tax on £57,430 above PA: basic rate on £37,700 = £7,540, higher rate on £19,730 = £7,892. Total: £15,432
- Class 4 NI: (£50,270 - £12,570) × 9% = £3,393, (£70,000 - £50,270) × 2% = £395. Total: £3,788
- Class 2: £179
- Total tax + NI: £19,399
- Take-home: £50,601
Limited company (£12,570 salary + dividends)
- Salary: £12,570. Employer NI on £7,570 = £1,136
- Remaining profit: £70,000 - £12,570 - £1,136 = £56,294
- Corporation Tax (19%): £10,696
- Post-tax: £45,598 as dividends
- Dividend tax: £500 free; £32,700 at 8.75% = £2,861; £12,398 at 33.75% = £4,184. Total: £7,045
- Total taxes: ~£19,877 (CT £10,696 + dividend tax £7,045 + employer NI £1,136)
- Take-home: ~£50,123
At £70,000, the sole trader is actually marginally better on pure take-home. The company structure carries its overheads without a large advantage here.
Worked Example: £100,000 Profit
Sole trader
- Income tax: Basic £7,540 + Higher on (£100,000 - £12,570 - £37,700) × 40% = £19,892 + taper trap impact if no pension planning
- Class 4 NI: £3,393 + (£100,000 - £50,270) × 2% = £994. Total NI: £4,387
- Class 2: £179
- Total tax + NI: approx £32,006
- Take-home: approx £67,994
Limited company (£12,570 salary + dividends)
- Employer NI: £1,136
- Remaining profit: £86,294
- Corporation Tax (25% marginal relief zone): approx £20,500
- Post-tax distributable: ~£65,794
- Dividend tax (higher rate on most dividends above PA): ~£18,500
- Total taxes: approx £40,136
- Take-home: approx £59,864
Wait — the limited company appears worse at £100,000? This is because you are extracting all profits as dividends. The real advantage of a limited company at higher incomes comes from retaining profits inside the company rather than drawing them all out. If you only need £50,000 to live on, leave the rest in the company taxed at 19% CT rather than drawing it and paying 40%+ dividend tax immediately.
The Retention Strategy: Where Limited Companies Win
The genuine advantage of a limited company at higher profit levels is deferral and control. You pay 19–25% Corporation Tax on profits inside the company. You then draw dividends in future years when your personal income may be lower — retiring early, taking maternity/paternity leave, or simply managing annual income to stay below higher rate thresholds.
| Profit needed personally | Profit retained in company | CT rate | Personal tax deferred |
|---|---|---|---|
| £30,000 from £80,000 profit | £50,000 | 19% | Potentially £17,000+ |
Administration and Costs
| Consideration | Sole Trader | Limited Company |
|---|---|---|
| Annual accounts | Basic (often DIY) | Statutory accounts required |
| Filing obligations | Self Assessment only | HMRC CT return + Companies House confirmation statement |
| Accountant cost | ~£300–£600/year | ~£800–£2,000/year |
| Personal liability | Unlimited | Limited |
| Perceived credibility | Lower (some clients) | Higher (often preferred) |
| IR35 considerations | N/A | Relevant if contracting |
When to Consider a Limited Company
The tipping point varies but a useful rule of thumb is that a limited company becomes meaningfully beneficial when:
- Profits exceed approximately £50,000–£60,000 per year, and
- You do not need to draw all profits personally, or
- You want to separate personal and business liability, or
- Your clients require or prefer to contract with a limited company
Below £40,000–£50,000 in profit, the administrative overhead typically erodes any tax saving. A good accountant can model your specific numbers.
The Bottom Line
Sole trader is simpler, cheaper to administer, and perfectly fine for most freelancers and self-employed people with modest profits. Limited company structures offer the greatest advantage when profits are high enough to retain inside the company at the 19–25% CT rate. Use our self-employment tax calculator to estimate your current sole trader liability, then speak to an accountant about whether incorporation makes sense for your level of income.