Should you operate as a sole trader or form a limited company? It's one of the first questions new business owners ask. The answer isn't the same for everyone, but there's a clear framework to think about it.
The Basic Difference
As a sole trader, you and your business are one legal entity. You pay income tax and National Insurance on your profit. You're personally liable if something goes wrong.
As a limited company, you're a separate legal entity. Your company pays Corporation Tax on profits. You pay yourself salary and/or dividends. You have limited liability if the company gets sued or goes into debt.
Mostly though, this is a tax question. Let's look at the maths.
Tax Comparison at Different Profit Levels
At £25,000 profit:
Sole trader: Income tax £1,450 + National Insurance £2,000 = £3,450 tax. Take-home: £21,550
Limited company: Corporation tax £6,250. Pay yourself £12,570 salary (no tax). Remaining: £6,180. Dividend allowance: £1,000 tax-free. Taxable dividends: £5,180 at 10.75%: £556. Total tax £6,806. Take-home: £18,994
Winner: Sole trader. You keep an extra £2,556.
At £50,000 profit:
Sole trader: Income tax £7,143 + National Insurance £5,225 = £12,368 tax. Take-home: £37,632
Limited company: Corporation tax £12,500. Pay yourself £12,570 salary (no tax). Remaining: £24,930. Dividend tax (after allowance): £2,476. Total tax £14,976. Take-home: £35,024
Winner: Sole trader (slightly). You keep an extra £2,608.
At £80,000 profit:
Sole trader: Income tax £12,893 + National Insurance £8,425 = £21,318 tax. Take-home: £58,682
Limited company: Corporation tax £20,000. Pay yourself £12,570 salary (no tax). Remaining: £47,430. Dividend tax (after allowance): £4,871. Total tax £24,871. Take-home: £55,129. Plus: You can leave £10,000-15,000 in the company for equipment or cash flow.
Winner: It's close. Limited company gives you flexibility.
At £150,000 profit:
Sole trader: Income tax £31,268 + National Insurance £15,625 = £46,893 tax. Take-home: £103,107
Limited company: Corporation tax £37,500. Pay yourself £50,000 salary (income tax and NI £11,175). Remaining: £51,325. Dividend tax (after allowance): £5,388. Total tax £53,063. Take-home: £96,937. Plus: £27,000+ left in company for flexibility.
Winner: Limited company. You keep £18,170 more. And you have company cash to work with.
So When Should You Incorporate?
Based on pure tax:
- Under £50,000 profit: Sole trader is usually slightly better.
- £50,000-£80,000 profit: It's very close. Sole trader slightly better, but limited company gives flexibility.
- Over £80,000 profit: Limited company starts to win.
- Over £150,000 profit: Limited company clearly wins.
But it's not just about tax. Consider:
Credibility. Some clients prefer dealing with limited companies. "Ltd" after your name sounds more established.
Liability protection. As a sole trader, you're personally liable for business debts. With a limited company, usually only the company's assets are at risk.
Growth plans. If you're planning to raise investment or sell the business, limited company is better structured.
Admin burden. Limited companies have more filing requirements. Sole traders are simpler.
Flexibility. Limited companies let you keep profit in the company, use it for tax planning, or save it for lean months.
The Real Decision
If your profit is under £60,000 and you're happy doing your own accounts, sole trader is simpler. Once profit gets above that, the flexibility of a limited company becomes valuable even if tax is a wash.
Use our decision tool to think through your specific situation. Then talk to an accountant about the numbers. It's a conversation worth having.
And if you're already operating as a sole trader and profit is climbing, don't assume you're in the wrong structure. Run the numbers. Sometimes incorporating is worth it, sometimes it's not. You need to know your actual figures.
