A practical 2026 comparison of operating as a UK limited company versus a sole trader covering tax, National Insurance, liability, admin, credibility, and the income levels at which switching becomes worthwhile.
Sole trader is simpler, cheaper, and has no Companies House filings. A Ltd becomes more tax-efficient once the combined savings from the 19% small profits corporation tax, the GBP 500 dividend allowance, and lower NI on dividends outweigh the extra accountancy costs. A Ltd also protects your personal assets and looks more credible to larger clients who avoid contracting with sole traders.
More than 4.3 million self-employed workers in the UK have to answer this question: should I trade in my own name as a sole trader, or set up a limited company (Ltd)? The answer used to be simple - sole trader until you earn enough that tax savings justify the admin, then incorporate. HMRC has closed some of the old Ltd advantages (the dividend allowance has dropped from GBP 5,000 in 2016 to GBP 500 today, and dividend tax rates increased by 1.25 percentage points in 2022), but Ltd status remains meaningfully more tax-efficient for mid-earning self-employed people and essential for anyone with real liability exposure.
This guide compares the two structures across fifteen practical dimensions using tax year 2025/26 and 2026/27 data. It explains the crossover point where incorporating starts to pay, walks through the National Insurance and dividend tax changes, and helps you pick the right path based on your actual business, not a generic rule of thumb. For full formation mechanics see our guide on United Kingdom company formation.
Simple, cheap, personal liability
Tax-efficient, protected, credible
| Factor | Sole Trader | Limited Company (Ltd) |
|---|---|---|
| Legal status | Same person as owner | Separate legal entity Winner |
| Personal liability | Unlimited | Limited to share capital Winner |
| Tax on profit | Income tax 20/40/45% + Class 4 NI | Corporation tax 19-25% Winner |
| Tax efficiency above GBP 50k profit | Lower | Higher Winner |
| Tax efficiency below GBP 30k profit | Higher Winner | Similar or worse |
| Setup cost | Free Winner | GBP 50 Companies House fee |
| Time to set up | Immediate Winner | 24 hours typical |
| Annual admin | Self Assessment only Winner | Accounts, CT600, CS01, SA |
| Annual accountancy cost | GBP 0-500 Winner | GBP 800-2,000 |
| Public disclosure | None Winner | Accounts & directors public |
| Credibility with large clients | Lower | Higher Winner |
| Raising investment | Not possible | Shares, SEIS, EIS available Winner |
| Pension contributions | Personal limits | Employer contributions as corporate expense Winner |
| Loss relief | Against other income Winner | Carry forward in company only |
| Name protection | None | Registered name protected Winner |
A sole trader is simply a self-employed individual running a business in their own name or under a trading name. There is no separate legal entity - the person and the business are the same in law. You register with HMRC for Self Assessment (by 5 October after the end of the tax year in which you began trading), keep basic records of income and expenses, and file a personal tax return each year by 31 January. That is the entire regulatory footprint. Around 56% of UK businesses are sole proprietorships, making this the dominant structure for freelancers, tradespeople, consultants, and side-hustlers.
A sole trader pays income tax on taxable profit after the personal allowance (GBP 12,570 frozen through 2028). Rates are 20% on profits from GBP 12,571 to GBP 50,270, 40% from GBP 50,271 to GBP 125,140, and 45% above GBP 125,140. The personal allowance tapers away at GBP 1 per GBP 2 of income above GBP 100,000, producing a punishing 60% effective marginal rate between GBP 100,000 and GBP 125,140. On top of income tax, Class 4 National Insurance applies at 6% on profits from GBP 12,570 to GBP 50,270 (reduced from 9% in April 2024) and 2% above. Class 2 NI was abolished in April 2024 for most. If profits exceed the VAT threshold (GBP 90,000 from April 2024), registration becomes mandatory.
A private limited company, or Ltd, is a separate legal entity incorporated with Companies House. It has directors (who run the company), shareholders (who own it - typically the same people as directors for solo founders), and is governed by its articles of association. The owners' liability is limited to the amount they have paid or agreed to pay for their shares - the business itself bears its debts. Incorporating is fast (usually under 24 hours online), cheap (GBP 50 standard or GBP 78 same-day), and standard practice for UK businesses beyond freelance scale. See our full guide on UK company formation for step-by-step mechanics.
A Ltd pays corporation tax on taxable profit: 19% for profits up to GBP 50,000 (the small profits rate), 25% on profits above GBP 250,000 (the main rate), and a tapered marginal relief between GBP 50,000 and GBP 250,000 that produces an effective marginal rate of 26.5% in that band. The director then extracts money via salary, dividends, or a combination. The common tax-efficient pattern is a small director's salary (typically at the NI secondary threshold to secure state pension credits without paying NI) plus dividends for the remainder. Dividends are paid from after-tax profits and the shareholder pays dividend tax at 8.75% (basic), 33.75% (higher), or 39.35% (additional) above a GBP 500 dividend allowance. The combined corporation-plus-dividend tax is typically lower than income tax plus Class 4 NI at sole trader levels above roughly GBP 35,000-40,000 of profit, with the gap widening as income rises. See our UK corporate tax guide for rate detail.
Start lean. Registering with HMRC as a sole trader costs nothing and imposes minimum admin. Track your monthly profit. Once you are consistently clearing GBP 40,000 of profit per year and the trend is up, incorporate - the tax savings will pay for the accountant several times over, and limited liability becomes meaningful protection once you are contracting with real clients. If you are launching a venture-backed business or a product with liability risk from day one, incorporate immediately. For the end-to-end formation walkthrough, see our UK company formation guide, and compare the UK against other jurisdictions with our country comparison tool.
For most self-employed people under roughly GBP 35,000 to GBP 40,000 of annual profit, staying a sole trader is simpler and similarly tax-efficient. Above that crossover, a limited company usually saves tax through the 19% small profits corporation tax rate, the dividend allowance, and lower NI on dividends, while also providing limited liability protection and greater credibility with larger clients.
A sole trader pays income tax at 20%, 40%, or 45% plus Class 4 NI at 6% to the upper profits limit and 2% above. A Ltd pays corporation tax at 19% up to GBP 50,000 of profit, tapered to 25% above GBP 250,000. The director then pays personal tax on salary (income tax plus NI) or dividends (8.75%, 33.75%, or 39.35% after the GBP 500 dividend allowance). The combined Ltd rate is typically lower than sole trader tax above GBP 35,000 to GBP 40,000 of profit.
Limited liability means the company is a separate legal person. Creditors of the business can only pursue the company's assets, not the shareholders' personal property. Sole traders have unlimited personal liability, so personal assets including the family home are at risk if the business fails or is sued. For any business with meaningful risk exposure - client contracts, premises, product liability, employees - a Ltd provides materially safer structure.
Registration with Companies House costs GBP 50 online standard or GBP 78 same-day. Most founders also pay for a registered office service (GBP 30-200 per year) and an accountant for annual accounts (GBP 500-2,000). Becoming a sole trader costs nothing - you simply register for Self Assessment with HMRC, typically by 5 October after the end of the tax year in which you started trading.
Yes, it is a very common path. The process involves forming the Ltd, transferring assets and goodwill (often using incorporation relief under TCGA s.162 to defer capital gains tax), notifying HMRC and clients, updating contracts and bank accounts, and registering for VAT and PAYE as needed. Expect GBP 500 to GBP 2,000 in professional fees for a clean incorporation, and budget a few weeks for the transition.
Legally no, but in practice yes. A Ltd must file annual accounts at Companies House, a Confirmation Statement, a CT600 return with HMRC, and usually a personal tax return for the director. Missing deadlines triggers automatic fines. Most small Ltds pay GBP 800 to GBP 2,000 per year for full accountancy. Sole traders can realistically self-file via HMRC's online Self Assessment service at low incomes.
Use our interactive tools to estimate tax under each structure and compare jurisdictions.
