The basic difference
As a sole trader you and your business are the same legal entity. You own it, you keep the profits after tax, and there is no separation in law between your business and your personal affairs. Setting up is simple, you register with HMRC for Self Assessment and you are trading.
A limited company is a separate legal entity that you own through shares and usually run as a director. The company earns the money, owns the assets and owes the debts. You take money out as a salary, as dividends, or both. It is more formal to set up and run, but that separation brings real advantages.
Neither structure is universally better. The right choice depends on your profits, your attitude to risk, the image you want to present and how much administration you are willing to take on.
Legal liability
This is often the deciding factor. As a sole trader you have unlimited liability: if the business cannot pay its debts, your personal assets, potentially including your home, can be at risk. For many low-risk businesses this is a manageable concern, but for anyone taking on larger contracts or financial exposure it matters.
A limited company offers limited liability. Because the company is separate from you, your personal risk is generally limited to what you have put into the company, provided you act properly as a director and have not given personal guarantees. For businesses with meaningful risk, this protection is a strong reason to incorporate.
How each is taxed
The tax treatment is where the two structures diverge most, and it is the area that most often drives the decision.
Sole trader: Income Tax and National Insurance
As a sole trader you pay Income Tax on your business profits through Self Assessment, along with National Insurance. Income Tax works in bands: a personal allowance of £12,570 (currently frozen), then a basic rate of 20% on taxable income up to £37,700, a higher rate of 40% above that, and an additional rate of 45% on taxable income over £125,140. You pay tax on the profit the business makes, whether or not you take it out.
Limited company: Corporation Tax, then personal tax on what you draw
A company pays Corporation Tax on its profits. The small profits rate is 19% where profits are £50,000 or less, and the main rate is 25% where profits exceed £250,000, with marginal relief tapering between the two (an effective rate of 26.5% applies in that band). You then pay personal tax on the money you take out of the company.
Directors commonly take a modest salary plus dividends. Dividends have their own tax rates and a dividend allowance (currently £500), and the salary and dividend mix affects both your Corporation Tax and your personal tax. Because profit is taxed at the company level first and again when extracted, the comparison with sole trader tax is not a simple one, which is precisely why advice matters here.
The headline point
At lower profit levels the tax difference between the two structures is often modest, and the simplicity of sole trader status wins. As profits rise, the company route can become more tax-efficient because of how profit is taxed and extracted, and because profit left in the company is not immediately subject to personal tax. The crossover point depends on your numbers and what you need to draw, so it is worth modelling properly with tax planning rather than relying on a rule of thumb.
Admin and compliance
A company brings more obligations, and it is important to go in with eyes open.
| Area | Sole trader | Limited company |
|---|---|---|
| Set-up | Register for Self Assessment with HMRC | Incorporate at Companies House, register for Corporation Tax |
| Annual filing | Self Assessment tax return | Statutory accounts at Companies House, Corporation Tax return, confirmation statement, plus director's own Self Assessment |
| Public record | Private | Accounts and director details are on the public register |
| Record keeping | Business income and expenses | Full accounting records plus statutory registers |
| Taking money out | Simply draw profits | Salary and/or dividends, with records for each |
In short, a company is more visible, more formal and more work. For many owners the benefits justify it; for others, especially early on, the simplicity of sole trader status is worth keeping. A good accountant can take most of the extra admin off your hands either way.
When switching makes sense
Plenty of businesses start as sole traders and incorporate later, which is a perfectly sensible path. Common signals that it is worth looking at include:
- Rising profits. Once profits grow beyond the level where sole trader tax is comfortable, the company route may become more efficient.
- Growing risk. Larger contracts, employees or financial exposure make limited liability more valuable.
- Client expectations. Some clients and sectors prefer, or require, dealing with a limited company.
- Reinvesting profit. If you want to leave profit in the business to grow it, a company can be more tax-efficient than drawing everything personally.
- Raising finance or bringing in co-owners. Shares make ownership and investment far easier to structure.
Switching is not automatic or free of consequences. There are steps to transfer the business, and timing affects your tax, so it pays to plan it with an accountant rather than rushing. We cover the move end to end through company formation and ongoing limited company accounts.
Getting the decision right
The choice between sole trader and limited company comes down to your profits, your risk, your plans and how much admin you are prepared to take on. The tax difference is real but rarely the whole story, and the right answer for you this year may change as the business grows.
Because the figures and the trade-offs are specific to your situation, this is a decision worth talking through rather than guessing at. Request a consultation and we will model both options against your own numbers and give you a clear recommendation.
Frequently asked questions
Is a limited company always more tax-efficient than a sole trader?
No. At lower profit levels the difference is often small and sole trader simplicity can win. As profits rise, a company can become more efficient because of how profit is taxed and extracted, but it depends on your numbers and what you need to draw. Always confirm current rates with GOV.UK or ask us to model your position.
Can I switch from sole trader to limited company later?
Yes, and many businesses do. You incorporate a new company and transfer the business across. There are steps to follow and the timing affects your tax, so it is best planned with an accountant rather than done on the fly.
Do limited company accounts become public?
Yes. A company's accounts and certain director details are filed at Companies House and appear on the public register. Smaller companies can usually file reduced information, but some disclosure is unavoidable. Sole trader finances stay private.
Does a limited company cost more to run?
Generally yes, because there are more filings and obligations, statutory accounts, a Corporation Tax return, a confirmation statement and your own Self Assessment. Accountancy fees are usually higher as a result, though the tax savings and liability protection can outweigh the extra cost.
How do I actually pay myself from a limited company?
Usually through a combination of a salary and dividends. The company pays Corporation Tax on its profits, and you pay personal tax on what you draw. The most efficient mix depends on current rates and your wider income, so it is worth agreeing with your accountant each year.