Sole Trader vs Limited Company: Which Structure Is Right for Your UK Business?

This is usually the first real decision anyone starting a business in the UK has to make, and it genuinely changes your tax bill, your paperwork, and your personal risk. Here is how the two structures actually compare.

The core difference

Sole trader: you and your business are legally the same entity. You keep all profits after tax, but you are also personally liable for any business debts, there is no legal separation between your personal assets and the business.

Limited company: the company is a separate legal entity from you. It owns its own profits, enters its own contracts, and is liable for its own debts (in most circumstances). You are a director and, usually, a shareholder, employed by or extracting income from a business that is legally distinct from you personally.

Setting up: speed and cost

Sole trader: register with HMRC for Self Assessment. No cost, no Companies House involvement, you can typically start trading the same day.

Limited company: register with Companies House (a small filing fee applies), then register for Corporation Tax with HMRC. More paperwork upfront, but still usually completed within a day or two online.

Liability: the risk difference that matters most

This is often the deciding factor, regardless of tax.

As a sole trader, if the business cannot pay its debts, or is sued, your personal assets, your house, your savings, are potentially at risk. There is no legal wall between you and the business.

As a limited company director, the company's debts are generally the company's problem, not yours personally, provided you have not given a personal guarantee (common with small business loans and some leases) or acted improperly (wrongful trading, fraud). This is "limited liability", and it is the single biggest structural reason many growing or higher-risk businesses incorporate.

Tax comparison

This is where it gets genuinely complex, and where the right answer depends heavily on your specific profit level.

Sole trader tax

You pay Income Tax on all business profits through Self Assessment:

• Personal Allowance: £12,570 tax free
• 20% basic rate, 40% higher rate, 45% additional rate, depending on total income
• Plus Class 4 National Insurance: 6% on profits between £12,570 and £50,270, then 2% above that

There is no separation between "business profit" and "your income", everything the business makes (after allowable expenses) is taxed as your personal income in the year it is earned.

Limited company tax

The company pays Corporation Tax on its profits:

• 19% small profits rate on profits up to £50,000
• 25% main rate on profits over £250,000
• Marginal relief in between, with an effective marginal rate of 26.5%

You then extract money from the company as personal income, typically a combination of salary (which is a deductible business expense, reducing Corporation Tax) and dividends (paid from after-tax profit, taxed separately on you as an individual through Self Assessment). See our salary vs dividends guide for how to structure this split.

Dividend tax rates (2026/27): £500 tax-free dividend allowance, then 10.75% basic rate, 35.75% higher rate, 39.35% additional rate.

Crucially, profit left inside the company that you do not extract is only taxed at the Corporation Tax rate, not at your personal Income Tax rate, until you actually take it out. This is why limited companies are often more tax efficient at higher profit levels: you can leave profit in the company, taxed at 19 to 25%, rather than drawing it all out and paying up to 45% Income Tax on it immediately.

Where the numbers land: at lower profit levels (very roughly, under £30,000 to £40,000 profit, though this varies by circumstance), the extra administrative cost of running a limited company often outweighs the tax saving. At higher profit levels, particularly once you are comfortably into higher-rate Income Tax territory as a sole trader, incorporating usually becomes more tax efficient, but the exact crossover point depends on your specific income, expenses, and how much you actually need to draw out to live on.

Ongoing admin and cost

Sole trader:

• One Self Assessment return a year
• Simpler bookkeeping requirements
• No requirement to file public accounts

Limited company:

• Annual accounts filed with Companies House (which become publicly viewable)
• A Confirmation Statement filed annually
• A Corporation Tax return (CT600) filed with HMRC
• Payroll if you pay yourself a salary
• Your own Self Assessment return, for dividend and any other personal income
• Generally higher accountancy costs, reflecting the extra filings

Privacy

Sole trader finances are private. Limited company accounts, and the identity of directors and significant shareholders, are publicly searchable on Companies House. If privacy matters to you, this is worth weighing alongside the tax numbers.

How Books & Returns helps

Choosing between sole trader and limited company is not a one-size-fits-all decision, it depends on your actual numbers, your risk tolerance, and your plans for the business. We help clients model both options against their real profit projections, handle the setup either way, and can support a smooth transition from sole trader to limited company once the numbers make sense.

This guide is for general information only and does not constitute tax or legal advice. The right structure depends on your specific circumstances, always confirm your position with a qualified accountant before making decisions based on this content.