Company Formation vs Sole Trader: Which is Right for You?

Most people starting a business in the UK pick one of two routes: register as a sole trader, or form a limited company. Company vs sole trader is not a question with one right answer. It turns on how much you expect to make, how much risk the work carries, and how much paperwork you are willing to take on. This guide sets the two side by side using the 2026 to 2027 tax rates, so you can see where each one makes sense.

The short answer

If you are testing an idea, expect modest profits or want the least admin, start as a sole trader. A limited company earns its keep when you can leave profit in the business, when the work could leave you owing large sums, or when clients expect one. Since April 2026, simply taking all the profit out of a one-person company saves little or no tax, so the decision is about more than the tax bill. Many people start as sole traders and form a company once the business has proved itself.

What each one actually is

Sole trader

As a sole trader, you and the business are the same person in law. You keep all the profit after tax, you make the decisions, and you are personally responsible for any debts the business runs up. Setting up means telling HMRC you are self-employed and registering for Self Assessment. You must do that by 5 October after the end of the tax year in which you started trading.

Limited company

A limited company is a separate legal person, registered at Companies House. It owns its money, signs its own contracts and owes its own debts. You run it as a director and usually own it as a shareholder. Because the company is separate, your personal liability is normally limited to what you put into it, although directors can still be held responsible for wrongful trading or personal guarantees they sign.

Company vs sole trader: the key differences

Sole traderLimited company Legal statusYou are the businessA separate legal person Liability for debtsUnlimited, personalUsually limited to what you invest Set-upRegister with HMRC, freeRegister at Companies House, £100 fee Tax on profitsIncome Tax and Class 4 National InsuranceCorporation Tax, then tax on what you take out Yearly filingsOne Self Assessment returnAccounts, Corporation Tax return, confirmation statement, directors' returns PrivacyNothing publishedDirectors, owners and accounts on the public register

How sole traders are taxed

A sole trader pays Income Tax on all the profit, whether it is drawn out or left in the bank. For 2026 to 2027 the first £12,570 is covered by the personal allowance, the next £37,700 is taxed at 20%, income up to £125,140 at 40% and anything above that at 45%. On top of that comes Class 4 National Insurance: 6% on profits between £12,570 and £50,270, and 2% above.

Take a sole trader with £30,000 of profit. Income Tax is £3,486 and Class 4 National Insurance is £1,045.80, so they keep about £25,468. At £60,000 of profit the bill rises to £11,432 of Income Tax and £2,456.60 of National Insurance, leaving about £46,111.

How limited companies are taxed

A company pays Corporation Tax on its profits: 19% on profits up to £50,000, 25% above £250,000, and a rate in between through Marginal Relief. You then pay personal tax on what you take out. Most owner-directors take a small salary and the rest as dividends.

Dividends have a £500 tax-free allowance. Above that, dividend tax is 10.75% in the basic rate band and 35.75% in the higher rate band from April 2026. Dividends are not subject to National Insurance, which is where most of the saving comes from.

Here is the same £30,000 of profit run through a company with one director, who takes a £12,570 salary and the rest as dividends. The company pays £1,135.50 of employer National Insurance on the salary (15% above £5,000; a company whose only employee is its director cannot claim the Employment Allowance), then £3,096 of Corporation Tax. The director pays £1,365 of dividend tax and keeps about £24,400: roughly £1,065 less than the sole trader. At £60,000 the two come out almost level, at about £46,100 each.

So where is the saving? It is in the profit you do not take out. Profit left in a company is taxed at 19%, while the same profit earned by a higher-rate sole trader costs 42% in Income Tax and National Insurance. If you would leave £10,000 in the business to grow it, that is £1,900 of tax in a company against £4,200 as a sole trader. Company pension contributions, and paying a spouse who works in the business, can help too. These figures are illustrations, as other income and allowances change the result, which is why we always run the numbers for your own situation.

The paperwork each route brings

The tax saving is only half the picture. A limited company comes with more obligations, and missing them brings automatic penalties.

• Sole trader: keep records of income and costs, file one Self Assessment return a year by 31 January, and pay the tax due. If your turnover passes £90,000, you also register for VAT.
• Limited company: prepare annual accounts for Companies House and HMRC, file a Corporation Tax return, file a confirmation statement every year, run payroll if you pay a salary, keep the company's statutory records, and file a personal Self Assessment return as a director in most cases.

Every director and person with significant control must also verify their identity with Companies House. It is a one-off check, but it has to be done before you can be appointed.

Other things to weigh up

Liability and risk

If your work could lead to a large claim, such as building work, consultancy where advice goes wrong, or importing stock on credit, limited liability matters. As a sole trader, your house and savings are exposed to business debts. Insurance helps either way, but the structure is the first line of protection.

Credibility

Some larger clients, agencies and public bodies only contract with limited companies. If you work through recruitment agencies or with corporate clients, a company can open doors that a sole trader cannot.

Privacy

A sole trader's details stay private. A company's directors, shareholders with significant control and annual accounts appear on the public Companies House register. A registered office address keeps your home address off the register.

Taking money out

A sole trader can move money from the business account whenever they like. A company's money belongs to the company: you take it as salary, dividends or expense refunds, each with its own rules. Borrowing from the company through a director's loan has tax consequences if it is not repaid on time.

Company vs sole trader: when switching makes sense

You can start one way and change later. Common signs it is time to form a company:

• profits are into the higher-rate band and you do not need to draw out everything the business earns
• a client or contract asks for a limited company
• the business is taking on bigger risks, staff or premises
• you want to bring in a partner or investor with a share of the business

When you switch, you stop trading as a sole trader, file a final Self Assessment for that business, and the company takes over from its start date. Contracts, bank accounts and insurance move to the company's name.

How we can help

If you are ready to start, we can register you as a sole trader with HMRC or form your limited company, usually the same working day. If you are not sure which suits you, get an instant quote for your accounts either way, or ask our accountants to compare the two using your own figures.