It's usually one of the first decisions a new business makes, and one of the easiest to put off, because none of the three options is wrong. They work differently enough, though, in liability, in tax and in day-to-day administration, that it's worth understanding each before you register anything. This guide compares sole trader, partnership and limited company side by side.

The short version

A sole trader is one person running a business in their own name. A partnership is two or more people running a business together and sharing its profits. A limited company is a separate legal entity that owns the business, pays its own tax and is owned by its shareholders. Sole trader and partnership are the simplest to run. A limited company gives you more protection and more flexibility over how you are paid, but brings more rules, more filing and a public record at Companies House.

Liability: what actually changes

As a sole trader there's no legal separation between you and the business. In a partnership, each partner is personally liable for its debts, including debts taken on by another partner acting for the business. If the business can't pay, your personal assets are, in principle, at risk.

A limited company is different. It owns the assets and owes the debts, and a shareholder's liability is normally limited to what they agreed to pay for their shares. That protection has limits, because lenders often ask directors for personal guarantees and directors have legal duties of their own. A limited liability partnership (LLP) is a middle option, with limited liability for its members but taxed like a partnership.

How each is taxed

A sole trader or partner pays Income Tax and Class 4 National Insurance on their share of the profit through Self Assessment, whether or not that money stays in the business. A partnership files its own return showing how the profit is shared, and each partner then includes their share on their personal return.

A limited company pays Corporation Tax on its profit, and you are then taxed separately on whatever you take out as salary or dividends. That second layer is why a company can be more tax-efficient at some profit levels and not at others. If you live in Scotland, a sole trader's or partner's profit, and a director's salary, are taxed at Scottish Income Tax rates, while dividends are taxed at the UK-wide dividend rates. We explain the Scottish bands in Scottish Income Tax vs the rest of the UK.

Taking money out

Sole traders and partners draw money as they need it, and tax is based on profit, not on drawings. In a company the money belongs to the company, so you normally take it as a salary, which runs through payroll, and as dividends, which can only be paid from profits left after tax. Other withdrawals are usually treated as a director's loan, which has its own tax rules. We explain these in our pay guide and in our article on director's loans.

Administration and cost

A sole trader's administrative burden is the lightest: register with HMRC, keep records, file one Self Assessment return a year. A partnership adds a partnership return and, sensibly, a written partnership agreement setting out how profits, decisions and an eventual exit are handled. The law doesn't require one, but without it the default rules apply and may not match what the partners intended.

A limited company carries the most: statutory accounts, a Corporation Tax return, a confirmation statement at least once a year, payroll if you pay yourself a salary, and a public record of its directors and finances at Companies House. It usually costs more to run than a sole trader business of the same size. None of this makes incorporation the wrong choice, but it is a real increase in what needs to be kept on top of, usually best handled with support. Sole traders and partners are also affected by Making Tax Digital for Income Tax, which phases in from 2026 to 2028 depending on income.

Why many people start as a sole trader and incorporate later

There's no requirement to get this right on day one. A common and sensible path is to trade as a sole trader while the business finds its feet, then incorporate once one or more of these becomes true:

  • Profits are rising and you want to leave some of them in the business.
  • The risks have grown, such as bigger contracts, staff or premises.
  • A customer, lender or contract prefers or requires a limited company.
  • You plan to bring in a partner or investor, or eventually sell.

Can I change structure later?

Yes. It's common, and we help clients do it regularly. Moving a sole trader or partnership into a company means transferring the business, with tax and practical consequences for assets, stock, goodwill, VAT registration, contracts and bank accounts, and closing the old business with HMRC. It's worth planning rather than switching on a whim, but changing your mind isn't a problem.

Which structure is most tax-efficient?

There's no universal answer. It depends on how much the business earns, how much you need to take home, your other income and your plans for the next few years. The sensible approach is to work through the options with your real figures rather than rely on a rule of thumb, which is exactly the conversation we have with clients at the start.

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