The core difference between a limited company and a sole trader in the UK is liability and tax. A sole trader is the business — their personal assets are exposed to business debts. A limited company is a separate legal entity, so personal liability is capped at share capital. Tax treatment also diverges significantly once annual profits exceed roughly £30,000–£35,000.
What is the difference between a limited company and a sole trader?
A sole trader is the simplest business structure: you register with HMRC for Self Assessment, keep records, file a tax return, and pay Income Tax and Class 4 National Insurance on profits. There is no Companies House registration, no separate legal entity, and no corporation tax. The trade-off is unlimited personal liability — business debts are your debts.
A limited company incorporated through Companies House is a distinct legal person. It can own assets, enter contracts, employ people, and carry debts entirely in its own name. The shareholders' liability is limited to the nominal value of their shares — typically £1 or £100. This separation is real, but it has limits: banks often require personal guarantees from directors, and courts can pierce the corporate veil in cases of fraud.
| Feature | Limited Company | Sole Trader |
|---|
| Legal entity | Separate legal person (registered at Companies House) | No separate entity — you are the business |
| Personal liability | Limited to share capital (e.g. £1 or £100) | Unlimited — personal assets at risk |
| Tax on profits | Corporation Tax: 19% (≤£50k) / 25% (>£250k) per HMRC | Income Tax: 20%, 40%, 45% on profits above personal allowance |
| National Insurance | Director pays Class 1 NI on salary; dividends have no NI | Class 2 (flat) + Class 4 (9% / 2%) on profits per HMRC |
| Admin burden | Higher — annual accounts, confirmation statement, CT return | Lower — Self Assessment tax return only |
| Privacy | Director names + registered office publicly visible on Companies House | No public register — private by default |
| Formation cost | £50 online per GOV.UK (+ ongoing accountancy) | Free — register with HMRC for Self Assessment |
| Annual running cost | £34 confirmation statement (per GOV.UK) + accountancy fees | No statutory fees — accountancy optional |
Tax rates per HMRC, statutory fees per GOV.UK / Companies House, May 2026.
When is it better to be a sole trader?
Sole trader is the right starting point when the business is early, simple, and low-risk. If you are testing an idea, freelancing on the side, or your annual profit is well below £30,000, the admin overhead and accounting costs of a limited company will likely exceed the tax savings. The tax advantage of a company at low profit levels is small to zero.
Sole trader also makes sense when privacy matters. A director's name and the company's registered office appear on the public Companies House register permanently. Some founders — particularly those running service businesses from home — prefer to avoid that exposure for as long as possible.
Other scenarios where sole trader works well: you are working alone with no employees, you have no meaningful liability risk (no physical products, client-facing premises, or large contracts), and you expect profit to remain modest. The moment any of those conditions changes, a limited company becomes worth revisiting.
When is it better to form a limited company?
A limited company becomes clearly better in four situations: profits are reliably above £30,000–£35,000 per year; the work carries real liability risk; you plan to hire employees; or you are seeking investment. At those thresholds and in those contexts, the tax efficiency, liability protection, and commercial credibility of a company outweigh the extra admin.
Commercial credibility is often underweighted. Many corporate clients, local authorities, and larger buyers require suppliers to be limited companies. Some contracts, insurance policies, and financing products are simply unavailable to sole traders. Incorporating early removes that friction.
For anyone planning to raise investment — angel funding, venture capital, EIS/SEIS schemes — a limited company is not optional. EIS and SEIS relief, available per HMRC, specifically require the investee to be an unquoted UK limited company.
At what income level does a limited company become more tax-efficient?
The crossover point is approximately £30,000–£35,000 of annual profit, though the exact figure varies with personal circumstances. Below that level, a sole trader's Self Assessment often produces a similar or lower total tax bill once you account for Corporation Tax, accountancy fees, and the cost of running payroll.
The limited company tax model works like this: the director takes a salary up to the National Insurance primary threshold — £12,570 per HMRC in 2025/26 — which is Corporation Tax-deductible and keeps personal NI liability to zero. Remaining profits are withdrawn as dividends. The first £500 of dividends is tax-free per HMRC (the dividend allowance). Above that, dividend tax rates (8.75%, 33.75%, or 39.35% depending on band) apply — but these are significantly lower than the equivalent income tax + NI rate on the same money drawn as salary through a sole-trader structure.
At £50,000 profit, the salary-plus-dividends model typically saves £3,000–£5,000 in tax compared with sole-trader status, net of accountancy fees. By £80,000, the saving is often £8,000–£12,000. These are illustrative ranges; a qualified accountant should model the specific figures for your circumstances. For more detail on the salary-versus-dividends decision, see the dividend vs salary guide for UK directors.
For founders ready to incorporate, the step-by-step process is in the how to set up a limited company guide. The Rajoka starting a business guides cover both routes in full.
Frequently asked questions
Can I switch from sole trader to limited company later?
Yes. You can incorporate a limited company at any time, then transfer the business across. The transition involves closing the sole-trader HMRC registration, incorporating the company, opening a business bank account, and potentially transferring contracts and assets. An accountant can handle the handover cleanly, including any Capital Gains Tax considerations on transferred assets.
Is a limited company more expensive to run than a sole trader?
Yes, in terms of both statutory fees and accountancy costs. A limited company must file a confirmation statement (£34 per GOV.UK), annual accounts with Companies House, and a Corporation Tax return each year. Annual accountancy fees for a limited company typically run £600–£2,000+ compared with £200–£500 for a straightforward sole-trader Self Assessment.
Does a limited company always save tax compared to a sole trader?
No — at lower profit levels (below roughly £30,000) the tax saving is minimal or zero, and may be wiped out by higher accountancy costs. The salary-plus-dividends model becomes meaningfully more efficient from around £30,000–£35,000 of annual profit. The exact crossover depends on personal circumstances and should be modelled by an accountant.
Do sole traders need to register with Companies House?
No. Sole traders do not register with Companies House. They register with HMRC for Self Assessment before 5 October in the second tax year they trade. There is no public register entry, no annual accounts filing, and no confirmation statement. The only annual obligation is the Self Assessment tax return, due by 31 January each year.