The key differences at a glance
| Factor | Sole Trader | Limited Company (Ltd) |
|---|---|---|
| Legal status | You and the business are one legal entity | The company is a separate legal entity |
| Liability | Unlimited — personal assets at risk | Limited to company assets and guarantees |
| Setup cost | Free (register with HMRC) | £12 at Companies House |
| Tax on profits | Income Tax (20-45%) + NI | Corporation Tax (19-25%) + dividend tax |
| National Insurance | Class 2 + Class 4 | Employer and employee NI on salary only |
| Admin burden | Self Assessment once a year | Annual accounts, CT600, confirmation statement, payroll |
| Privacy | Your name only (no public register) | Director details on public register |
| Credibility | Lower perceived credibility | "Ltd" suffix adds professional weight |
| Accountant costs | £150-400/year | £500-2,000/year |
Tax comparison: where Ltd wins
The main financial advantage of a limited company is tax efficiency through salary and dividends. As a sole trader, all your profit is subject to Income Tax and National Insurance. As a Ltd director, you can pay yourself a small salary (typically £12,570 — the personal allowance) and take the rest as dividends, which are taxed at lower rates.
| Annual Profit | Sole Trader Tax | Ltd Tax (salary + dividends) | Saving |
|---|---|---|---|
| £25,000 | ~£3,800 | ~£3,200 | £600 |
| £40,000 | ~£8,200 | ~£5,800 | £2,400 |
| £60,000 | ~£14,700 | ~£10,200 | £4,500 |
| £80,000 | ~£22,000 | ~£15,800 | £6,200 |
Figures are approximate for 2025/26 and assume a single director-shareholder. Use the CalcPad Tax Calculator for a personalised estimate.
When to stay sole trader
- Your profits are under £30,000 — the tax savings of a Ltd often do not justify the extra accountancy costs and admin.
- You want minimal paperwork — sole trader bookkeeping and tax returns are genuinely simpler.
- You are testing an idea — start as a sole trader, prove the concept, then incorporate when it makes financial sense.
- You do not need liability protection — if you are a freelance writer or tutor, the risk of being sued is low.
When to go Ltd
- Profits exceed £30-40,000 — the tax savings start to significantly outweigh the costs.
- You want limited liability — essential if your business involves contracts, physical products, or employing people.
- You work with larger clients — some businesses and government bodies will only contract with limited companies.
- You want to bring in investors or partners — shares make it easy to divide ownership.
- You are building a brand to sell — a limited company is an asset that can be sold or transferred.
How to switch from sole trader to Ltd
There is no formal "conversion" process. You register a new limited company with Companies House(£12), transfer your business operations to it, and then deregister as a sole trader with HMRC. Key steps:
- Register the Ltd company
- Open a business bank account in the company name
- Transfer contracts, clients and assets to the new company
- Register for Corporation Tax, PAYE and (if applicable) VAT
- File a final Self Assessment as a sole trader
- Inform clients and update invoicing
An accountant can handle the transition for £200-500 and ensure nothing falls through the cracks.
IR35 and contractor considerations
If you are a contractor working through a limited company, you need to be aware of IR35 legislation. Since April 2021, medium and large private sector clients are responsible for determining your IR35 status. If you are deemed "inside IR35", you will be taxed as an employee, negating most Ltd tax advantages. This does not apply to sole traders (who are already taxed on personal income).
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