Choosing between sole trader and limited company is the first major decision every new business owner in the UK faces. Get it right and you pay less tax, protect your personal assets, and set your business up for growth. Get it wrong and you pay more than you need to, take on unnecessary risk, or drown in paperwork for no real benefit.

This guide compares the two structures on everything that matters — tax, liability, costs, admin, credibility, and when it makes sense to switch from one to the other.

What Is a Sole Trader?

A sole trader is the simplest business structure in the UK. You and your business are legally the same entity. There is no separation between your personal finances and your business finances. You keep all the profits, but you are also personally responsible for all debts and liabilities.

Setting up as a sole trader is free and takes minutes. You register with HMRC for Self Assessment, and you can start trading immediately. There is no Companies House registration, no annual accounts filing, and no need for a separate business bank account (though having one is strongly recommended for keeping records clean).

As a sole trader, you pay Income Tax on your profits and Class 2 and Class 4 National Insurance contributions. You must file a Self Assessment tax return each year by 31 January.

What Is a Limited Company?

A limited company is a separate legal entity from you. The company has its own identity, its own finances, and its own legal obligations. You are a director and often a shareholder, but the company exists independently of you.

The key advantage is limited liability. If the company gets into debt or faces a legal claim, your personal assets — your house, your car, your savings — are protected. Creditors can only pursue the company's assets, not yours. There are exceptions (fraud, personal guarantees, wrongful trading), but the general principle of separation between you and your business is the fundamental benefit.

Setting up a limited company costs as little as £12 to register with Companies House. You can do it online in about an hour. However, ongoing obligations are more complex — annual accounts must be filed with Companies House, a confirmation statement must be submitted each year, and Corporation Tax returns must be filed with HMRC.

As a limited company director, you typically pay yourself a combination of salary and dividends. The company pays Corporation Tax on its profits. You pay Income Tax and National Insurance on your salary, and Income Tax on dividends above the dividend allowance.

Tax Comparison: Where It Gets Interesting

Tax is usually the deciding factor. Here is how the numbers work at different profit levels.

Sole trader tax

As a sole trader, your profits are taxed as personal income. The current UK tax bands apply.

Your tax-free Personal Allowance is £12,570 per year. Profits between £12,570 and £50,270 are taxed at 20% (basic rate). Profits between £50,270 and £125,140 are taxed at 40% (higher rate). Profits above £125,140 are taxed at 45% (additional rate).

On top of Income Tax, you pay National Insurance. Class 2 NI is a flat weekly amount. Class 4 NI is charged at 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270.

Limited company tax

A limited company pays Corporation Tax on its profits. The current main rate is 25% for profits over £250,000. For profits under £50,000, the small profits rate of 19% applies. Between £50,000 and £250,000, marginal relief applies — the effective rate tapers between 19% and 25%.

As a director, you pay yourself a salary (typically set at the National Insurance threshold to minimise NI contributions) and take the rest of your income as dividends. Dividends are taxed at lower rates than salary: 8.75% (basic rate), 33.75% (higher rate), and 39.35% (additional rate). The dividend allowance is £500 per year — dividends below this amount are tax-free.

At what profit level does a limited company save you money?

The crossover point is typically around £30,000 to £35,000 in annual profit. Below this level, the tax difference is minimal and the extra admin of running a limited company is not worth it. Above this level, the combined Corporation Tax plus dividend tax is usually less than the Income Tax plus National Insurance you would pay as a sole trader.

At £50,000 profit, a limited company typically saves £3,000 to £5,000 per year in tax compared to a sole trader. At £80,000, the saving can be £6,000 to £8,000. The exact figures depend on your personal circumstances, other income, and how you structure your salary and dividends.

These numbers change when tax rates and thresholds change, which is why it is worth reviewing your structure annually or whenever the Chancellor announces a Budget. Our freelancer tax guide covers the Self Assessment process for sole traders.

Personal Liability

This is the other major factor and one that many new business owners underestimate.

Sole trader: You are personally liable for everything. If your business owes money it cannot pay, creditors can come after your personal assets. If a client sues your business, they are suing you personally. If your business fails with outstanding debts, those debts become your personal debts.

Limited company: The company is liable for its own debts and obligations. Your personal assets are protected unless you have given a personal guarantee (which banks often require for business loans) or have been found guilty of fraud or wrongful trading.

If your business involves any significant risk — client contracts, physical products, employee liability, significant debts — limited liability is a meaningful protection. If you are a freelance writer working from home with no employees and no debts, the risk profile is lower and sole trader status may be perfectly adequate.

Setup and Running Costs

Sole trader setup: Free. Register with HMRC online. Takes 10 minutes.

Limited company setup: £12 to register with Companies House online. Can also use a formation agent (typically £20 to £100) who handles the paperwork and provides a registered office address.

Sole trader running costs: Minimal. You need to file one Self Assessment tax return per year. Many sole traders handle this themselves using HMRC's online system. If you use an accountant, expect to pay £150 to £400 per year for a simple sole trader tax return.

Limited company running costs: More involved. Annual accounts must be prepared and filed with Companies House. A Corporation Tax return must be filed with HMRC. A confirmation statement must be submitted annually. Payroll must be run if you pay yourself a salary (even a minimal one). Most limited company directors use an accountant — expect to pay £800 to £2,000 per year depending on complexity.

The accountancy costs are real but need to be weighed against the tax savings. If a limited company saves you £5,000 per year in tax but costs £1,500 in accountancy fees, you are still £3,500 better off.

Admin and Record Keeping

Sole trader: Keep records of income and expenses. File a Self Assessment tax return once per year. That is essentially it. You can use a simple spreadsheet or basic accounting software. Our guide to the best budgeting apps includes tools that can help track business expenses.

Limited company: Maintain proper accounting records. Prepare and file annual accounts with Companies House (publicly available). File a Corporation Tax return with HMRC. Submit a confirmation statement annually. Run payroll for director salary (even if it is just you). File quarterly VAT returns if VAT-registered (applies to both structures once turnover exceeds £90,000). Keep a register of directors, shareholders, and people with significant control.

The admin burden of a limited company is meaningfully higher. If you hate paperwork or do not want to pay an accountant, this is a genuine consideration.

Business Credibility

A limited company can appear more professional and established to certain clients and partners. The "Ltd" after your name signals a formally registered entity. Some larger companies and government bodies prefer or require working with limited companies rather than sole traders.

For freelancers and small service businesses, this matters less than you might think. Most clients care about the quality of your work, not your legal structure. But in B2B environments — particularly consulting, IT, and professional services — operating as a limited company can open doors.

Having a registered company number, a Companies House listing, and formal accounts can also help when applying for business bank accounts, loans, or credit facilities.

IR35: If You Work Through Contracts

If you provide your services to clients through a contract — particularly in IT, consulting, or professional services — IR35 legislation is critical to your decision.

IR35 is tax legislation designed to identify contractors who work like employees but operate through a limited company to pay less tax. If HMRC determines your working arrangement falls inside IR35, you must pay tax equivalent to an employee — eliminating most of the tax advantages of a limited company.

For assignments in the public sector or with medium and large private companies, the client determines your IR35 status. For small private company clients, you determine your own status.

If most of your work falls inside IR35, the tax advantages of a limited company are significantly reduced, and sole trader status may be simpler and more appropriate. If your work is genuinely outside IR35 — you control how, when, and where you work, you provide your own equipment, and you can send a substitute — a limited company offers significant tax benefits.

This is an area where professional advice from an accountant or IR35 specialist is strongly recommended. Getting it wrong can result in significant tax bills and penalties.

When to Switch from Sole Trader to Limited Company

There is no legal requirement to switch. You can remain a sole trader no matter how large your business grows. But there are triggers that suggest it is time to consider incorporating.

Your annual profits consistently exceed £30,000 to £35,000. At this point, the tax savings of a limited company typically outweigh the additional costs and admin.

You want to protect your personal assets. If your business is taking on debt, signing contracts with liability clauses, or growing to the point where legal risk increases, limited liability becomes genuinely valuable.

You want to bring in investors or partners. A limited company has a share structure that makes it straightforward to bring in co-owners, investors, or to sell part of the business.

You want to retain profits in the business. A limited company can retain profits and reinvest them, paying Corporation Tax at 19-25% rather than the 40-45% Income Tax you would pay as a sole trader on the same money.

A client requires it. Some clients, particularly in the public sector, will only contract with limited companies.

When to Stay as a Sole Trader

Your profits are below £30,000 per year and you have no plans for significant growth. The tax savings of a limited company at this level are marginal and the extra admin and accountancy costs may actually leave you worse off.

You value simplicity. One tax return per year, no Companies House filings, no payroll, no annual accounts. For many small businesses and side hustles, this simplicity is worth more than marginal tax savings.

Your business has low risk. If you work alone, have no debt, provide services rather than products, and your worst-case scenario is a client not paying an invoice, the liability protection of a limited company is less valuable.

You are testing a business idea. Start as a sole trader to validate your concept. If the business takes off, you can always incorporate later. There is no penalty for switching.

How to Make the Switch

If you decide to incorporate, the process is straightforward.

Register a limited company with Companies House. Open a business bank account in the company name. Inform HMRC that you are now operating as a limited company. Transfer your business to the company (your accountant can advise on the best way to handle existing contracts, assets, and clients). Set up payroll for your director salary. Continue filing your sole trader Self Assessment for the period before incorporation.

Most accountants can handle the entire transition for you. The process typically takes a few weeks.

Frequently Asked Questions

Can I be a sole trader and run a limited company?

Yes. You can be a sole trader for one business and a director of a limited company for another. Each is taxed separately.

Do I need an accountant for a limited company?

Not legally, but practically, yes. The filing requirements are complex enough that the cost of an accountant is almost always justified by the time saved and mistakes avoided.

Can I change from limited company back to sole trader?

Yes, but the process is more complex than the other way around. You would need to close the limited company (either by dissolution or striking off) and resume trading as a sole trader.

Do sole traders pay less tax?

Not necessarily. Below around £30,000 profit, the difference is minimal. Above that, limited companies typically pay less total tax through the salary-plus-dividends structure.

What is the VAT threshold?

The current VAT registration threshold is £90,000. This applies to both sole traders and limited companies. Once your taxable turnover exceeds this amount, you must register for VAT regardless of your business structure.

Last updated: March 2026. Tax rates, thresholds, and allowances are based on current HMRC published figures and may change in future Budgets. This guide is for informational purposes only and does not constitute tax advice. Consult a qualified accountant for advice specific to your circumstances.