Sole Trader vs Limited Company UK: How to Choose the Right Structure in 2026

Companies House registered over 900,000 new limited companies in the twelve months to March 2026. That is roughly one new incorporation every 35 seconds. At the same time, millions of people continue to trade as sole traders — the simplest and most common business structure in the UK. So which is right for you?

The answer depends on how much you earn, how much personal risk you are comfortable with, and where you want the business to go. A sole tradership costs nothing to set up and takes five minutes. A limited company costs £100 to incorporate online and comes with ongoing compliance duties. But for many founders, the tax savings, liability protection, and credibility that a limited company provides repay that effort many times over.

This guide breaks down every material difference — tax, liability, National Insurance, admin, privacy, and growth potential — with real numbers for the 2026/27 tax year so you can make the decision with your eyes open.

What is a sole trader?

A sole trader is an individual who runs a business in their own name. There is no legal separation between the person and the business. You keep all the profits after tax, but you also carry all the risk. If the business owes money it cannot pay, creditors can pursue your personal assets — your savings, your car, your home.

Setting up is straightforward: you register with HMRC for Self Assessment, choose a trading name if you want one, and start trading. There is no formation fee, no Companies House registration, and no public register of your details. You file a single Self Assessment tax return each year (by 31 January) and pay Income Tax plus National Insurance on your taxable profits.

What is a limited company?

A private company limited by shares (the standard “Ltd”) is a separate legal entity. It owns its own assets, enters its own contracts, and is liable for its own debts. The shareholders’ liability is limited to the amount unpaid on their shares — in practice, usually £1 if the shares were issued at £1 each and fully paid up. That separation is the core reason most founders incorporate.

Incorporation costs £100 online (£124 by post) and typically completes within 24 hours. Once incorporated, the company must file annual accounts, a confirmation statement, and Corporation Tax returns. Directors must comply with the Companies Act 2006, and since 18 November 2025, every director and person with significant control (PSC) must verify their identity with Companies House under the Economic Crime and Corporate Transparency Act (ECCTA).

Seven key differences at a glance

Before diving into the numbers, here is a high-level comparison of the two structures across the factors that matter most.

Personal liability

This is the single biggest reason to incorporate. As a sole trader, there is no legal barrier between your business debts and your personal assets. If a client sues you, a supplier chases an unpaid invoice, or your business simply fails owing money, creditors can come after everything you own.

A limited company ring-fences that risk. The company is the legal entity that owes the debt, not you personally. Directors can still face personal liability in specific circumstances — wrongful trading (s. 214 Insolvency Act 1986), fraudulent trading (s. 213 Insolvency Act 1986), or breach of director duties under ss. 171–177 of the Companies Act 2006 — but the default position is that shareholders’ exposure is limited to their invested capital.

Tax on profits

Sole traders pay Income Tax on their entire taxable profit: 20% on income between £12,571 and £50,270, 40% between £50,271 and £125,140, and 45% above that (2026/27 rates, England and Wales).

A limited company pays Corporation Tax on its profits: 19% on profits up to £50,000 (the small profits rate), rising to 25% on profits above £250,000, with marginal relief in between. The director then takes money out of the company — usually as a combination of salary and dividends — and pays personal tax only on what they extract, not on the full profit.

National Insurance

National Insurance is where the limited company structure delivers its biggest tax advantage. A sole trader pays Class 4 NI at 6% on profits between £12,570 and £50,270, plus 2% on everything above that. Class 2 contributions (£3.50 per week) are treated as paid automatically if profits exceed £6,845.

A limited company director who takes a small salary and the rest as dividends pays employee NI only on the salary — and no National Insurance at all on dividends. The company pays employer’s NI at 15% on salary above the secondary threshold, but on a modest director’s salary of £12,570 the employer NI bill is small. For higher earners, the NI saving alone can run into thousands of pounds a year.

Administrative burden

Sole traders file a Self Assessment tax return once a year and keep basic records. That is the extent of the regulatory overhead.

A limited company must file annual accounts with Companies House (due 9 months after the accounting reference date, or 21 months from incorporation for the first set), a confirmation statement every 12 months (£50 online), a CT600 Corporation Tax return with HMRC, and run payroll if the director takes a salary. You must also maintain statutory registers — the register of members, register of directors, register of directors’ residential addresses, PSC register, and register of charges. Most founders outsource the compliance to an accountant or a service like Filing HQ.

Privacy

Sole traders are not listed on any public register. Your name and business details are known to HMRC, but not to the general public.

Limited company directors appear on the Companies House public register. Your name, service address, nationality, month and year of birth, and date of appointment are all visible to anyone who searches. The day of birth is redacted, but month and year are not. Your residential address is held privately by Companies House and is not shown on the public register, though you must provide it at incorporation.

If you use your home address as the registered office, that address is also publicly visible. Many directors use a registered office address service to keep their home address off the public register — read our guide on the risks of using your home address for more on this.

Raising investment

Sole traders cannot sell equity in their business. If you want to bring in an investor, you would need to incorporate first. A limited company can issue new shares or facilitate a transfer of existing shares to investors, employees, or co-founders. If you have any ambition to raise external funding — angel investment, venture capital, or even a loan secured against the business — a limited company is the only practical structure.

Tax comparison with real numbers (2026/27)

The theoretical differences only matter once you see them in pounds and pence. Below are three scenarios comparing the total tax bill for a sole trader against a limited company director taking a salary at the personal allowance threshold (£12,570) and the remainder as dividends. These are simplified illustrations — your actual position will depend on pension contributions, expenses, and other income.

Scenario 1: £30,000 profit

Sole trader: Income Tax on £30,000 = £3,486 (20% on £17,430 above the personal allowance). Class 4 NI = £1,046 (6% on £17,430). Total personal tax: roughly £4,532.

Limited company: The director takes a £12,570 salary (no Income Tax, minimal NI). The company has roughly £17,430 of remaining profit after the salary deduction. Corporation Tax at 19% = £3,312. The director takes the remaining £14,118 as dividends. Dividend tax at 10.75% on £13,618 (after the £500 allowance) = £1,464. Total tax (corporate + personal): roughly £4,776.

At £30,000 profit, the sole trader structure is marginally cheaper. The limited company’s overhead and accountancy fees mean there is little financial incentive to incorporate at this level — though liability protection may still justify it.

Scenario 2: £60,000 profit

Sole trader: Income Tax = £11,432 (20% on the basic-rate band, 40% on £9,730 above £50,270). Class 4 NI = £2,452 (6% on £37,700, plus 2% on £9,730). Total: roughly £13,884.

Limited company: Salary of £12,570. Corporation Tax at 19% on £47,430 = £9,012. Dividends of £38,418. Dividend tax on £37,918 (after allowance): £37,700 at 10.75% + £218 at 35.75% = £4,131. Total tax: roughly £13,143.

The limited company saves approximately £741 per year. Add the NI saving on dividends and the gap widens further once accountancy costs are factored in. At this level, most founders find the liability protection tips the balance.

Scenario 3: £100,000 profit

Sole trader: Income Tax = £27,432 (basic rate on £37,700, higher rate on £49,730). Class 4 NI = £3,254 (6% on £37,700, plus 2% on £49,730). Total: roughly £30,686.

Limited company: Salary of £12,570. Corporation Tax at 19% on £87,430 = £16,612. Dividends of £70,818. Dividend tax on £70,318: £37,700 at 10.75% + £32,618 at 35.75% = £15,718. Total tax: roughly £32,330.

Wait — at £100,000, the limited company total looks higher? Not quite. The key factor is that the limited company director does not have to extract all the profit. Leaving £20,000 in the company for future investment drops the personal tax considerably, and the retained profit has only been taxed at 19% rather than the sole trader’s 40%. Over time, retained profits compound inside the company at a lower effective rate. Plus, the director still benefits from the liability shield regardless.

When to stay as a sole trader

Incorporation is not always the right move. A sole tradership is likely the better fit if:

• Your profits are below £30,000–£35,000. At this level, the tax savings from a limited company are minimal or non-existent, and the additional accountancy fees (£800–£2,000 per year for a basic limited company service) can outweigh the benefit.
• Your business carries low risk. If you are a freelance writer, a tutor, or a consultant whose work is unlikely to generate significant debts or legal claims, the liability protection of a limited company matters less.
• You want zero admin overhead. A sole trader files one Self Assessment return per year. A limited company has several filing obligations, statutory registers, and payroll to manage.
• You have no plans to raise investment or bring in partners. If the business is just you and will stay that way, the structural flexibility of a limited company adds nothing.
• Privacy matters to you. Your personal details stay off public registers when you trade as a sole trader.

When to incorporate as a limited company

A limited company is almost always the stronger choice when:

• Profits exceed £35,000–£40,000. The combined Corporation Tax and dividend tax route starts producing real savings above this threshold, and the gap grows quickly as profits rise.
• Your business carries meaningful liability. Contracts with large clients, physical products, professional services with the risk of negligence claims, or any business that holds stock or takes on debt. The limited liability shield exists for exactly these situations.
• You want to raise funding. Angels and VCs invest by buying shares. You cannot sell equity in a sole tradership.
• You want to bring in co-founders or key hires. Share options, vesting schedules, and the ability to issue different share classes only exist in a company structure.
• Credibility matters. Many B2B clients, procurement teams, and government tenders prefer or require suppliers to be limited companies. The “Ltd” suffix signals permanence and professionalism.
• You want to retain profits tax-efficiently. Corporation Tax at 19% on retained profits is significantly lower than the 40% Income Tax a sole trader would pay at the same income level. If you plan to reinvest in the business, the maths favours a company.

Common mistakes when choosing a business structure

We see these errors regularly at Filing HQ. Each one costs founders either money, time, or legal exposure.

Incorporating too early

If you are still validating an idea and bringing in under £20,000 a year, incorporating creates compliance costs with little offsetting benefit. Start as a sole trader, prove the model, and incorporate once the numbers justify it. You can always switch later.

Staying sole trader too long

The opposite mistake is more common — and more expensive. Founders who earn £60,000, £80,000, or more as sole traders because “it’s just simpler” are overpaying thousands of pounds in tax every year. The higher your income, the larger the penalty for not incorporating.

Treating the company bank account as a personal account

A limited company is a separate legal entity. Its money is not your money until you take it out as salary, dividends, or a director’s loan (and a director’s loan has its own tax consequences). Mixing personal and company finances undermines the liability shield and creates an accounting nightmare. While a business bank account is not legally required for a limited company, it is practically essential — keep the two streams completely separate from day one.

Ignoring post-incorporation compliance

The incorporation certificate is the start, not the finish. Late accounts attract penalties starting at £150 and climbing to £1,500. A missed confirmation statement can lead to your company being struck off the register — and administrative restoration costs £468+ and takes weeks. Read our full post-incorporation checklist to avoid this trap.

Forgetting identity verification

Since 18 November 2025, every director and PSC must verify their identity with Companies House. There are two routes: GOV.UK One Login (free, direct) or through an Authorised Corporate Service Provider (ACSP) like Filing HQ. Identity verification is a one-off per person — you do not need to repeat it for each new appointment. But if you skip it, your filings will not be accepted.

How to switch from sole trader to limited company

If you are already trading as a sole trader and want to incorporate, here is the process:

1. Incorporate the limited company. Register with Companies House online (£100) or use a formation service like Filing HQ. Choose your company name, appoint at least one director, and specify your SIC codes.
2. Verify your identity. Complete identity verification via GOV.UK One Login or an ACSP before filing the first appointment.
3. Open a business bank account. Set up a dedicated account in the company’s name. Most banks require the certificate of incorporation and proof of the director’s identity.
4. Transfer business assets and contracts. Move existing client contracts, intellectual property, domain names, and any physical assets from yourself (the sole trader) to the new company. Take professional advice on how to value and document this — particularly if goodwill is involved, as it has tax implications.
5. Notify HMRC. Register for Corporation Tax within three months of starting business activity in the company. If you are VAT-registered as a sole trader (mandatory once taxable turnover exceeds £90,000 in any rolling 12-month period), you will need to transfer or re-register the VAT number.
6. Set up payroll. If you plan to draw a salary, register for PAYE before the first payday (ideally two or more weeks earlier). PAYE is only required if you pay salaries — it is not triggered by incorporation or by paying dividends.
7. Close your sole trader Self Assessment. File a final Self Assessment return covering the period up to the date the sole trade ceased. You can tell HMRC you are no longer self-employed through your Government Gateway account.

The switchover does not have to be disruptive. Most founders pick a clean date — the start of a month or a new tax year — and run the sole tradership down while the company ramps up. Clients barely notice.

What ongoing compliance does a limited company require?

If the admin side of a limited company puts you off, it helps to know exactly what is involved. Here are the recurring obligations:

• Annual accounts: filed with Companies House. First set due 21 months from incorporation; subsequent sets due 9 months after the accounting reference date. Late filing penalties start at £150.
• Confirmation statement: due every 12 months, with a 14-day filing window after the review period ends. Online fee is £50; paper is £110. Must be filed even if nothing has changed.
• Corporation Tax return (CT600): due 12 months after the end of the accounting period. Corporation Tax payment due 9 months and 1 day after the period ends.
• Payroll (PAYE): only if you pay salaries. Monthly or quarterly RTI submissions to HMRC.
• Statutory registers: register of members, register of directors, register of directors’ residential addresses, PSC register, and register of charges. These are your company’s legal records — the public Companies House record is not the legal record.
• Accounting records: must be retained for at least 6 years from the end of the accounting period.

A private limited company is not required to appoint a company secretary (since the Companies Act 2006 removed that obligation). However, many founders find it useful to delegate filing responsibilities to a company secretarial service. Read our guide on whether you need a company secretary for your UK limited company.

Frequently asked questions

Can I be a sole trader and a limited company director at the same time?

Yes. There is no legal restriction on running a sole tradership alongside a limited company. Some people keep a small freelance side-income as a sole trader while their main business operates through a limited company. You will file Self Assessment for the sole trade income and Corporation Tax for the company — the two are separate.

Do I need a business bank account for a limited company?

A business bank account is not legally required for a UK limited company. However, it is practically essential. Mixing personal and company finances weakens the liability shield, complicates bookkeeping, and most lenders, investors, and payment processors require a dedicated business account.

How long does it take to incorporate a UK limited company?

Online incorporation through Companies House typically completes within 24 hours. Using a formation agent like Filing HQ is equally fast — most applications are approved the same working day. Paper applications take 8–10 days and cost £124.

Can I convert my sole trader business into a limited company?

You cannot “convert” a sole tradership into a limited company directly — they are fundamentally different legal structures. Instead, you incorporate a new company and transfer your business assets, contracts, and operations to it, then cease trading as a sole trader. See the step-by-step process above.

What happens to my sole trader tax return when I incorporate?

You file a final Self Assessment return covering the period from the start of the tax year (6 April) to the date the sole trade ceased. Any profits earned during that period are taxed as sole trader income. From the date the company starts trading, profits are taxed under Corporation Tax in the company’s name.

Is a limited company always more tax-efficient than a sole trader?

Not always. Below roughly £30,000–£35,000 in annual profit, the tax difference is negligible or can favour the sole trader once you account for the cost of accountancy, payroll, and Companies House filing fees. Above that level, the limited company route is usually cheaper — and the gap widens as profits increase. Always run the numbers for your specific situation.