Whether you run the business on your own or with someone else, you are probably thinking about the same few questions: who is responsible if things go wrong, how the profit is taxed, and how much paperwork there will be. This guide compares the two structures side by side. If a limited company is also on your list, we compare that with a partnership here, and look at all three together in our wider guide to choosing a structure.

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. Neither needs to be formally created at Companies House, both are taxed through Self Assessment, and both leave the people behind the business personally responsible for what it owes. The real differences are in who decides what, how the profit is split and reported, and what happens if someone wants out.

Who is responsible if the business can't pay?

As a sole trader, you and the business are the same person for legal purposes. If the business owes money, you owe it, and your personal assets are, in principle, at risk.

In a partnership, each partner is personally liable for the partnership's debts, including debts taken on by another partner acting for the business. That is the main reason a partnership calls for trust between the people involved, and for a proper written agreement.

How the profit is taxed

A sole trader is taxed on the whole profit of the business, whether or not they take it out. The tax is Income Tax and Class 4 National Insurance, reported once a year on a Self Assessment return.

A partnership does not pay tax itself. It files a partnership tax return showing the profit and how it is shared, and each partner is then taxed on their own share through their personal Self Assessment return. As with a sole trader, partners are taxed on their share of the profit, not on what they have drawn out. If you live in Scotland, Scottish Income Tax rates apply to your share, which we explain in our guide to Scottish and rest of UK Income Tax.

Paperwork and record-keeping

A sole trader registers with HMRC for Self Assessment, keeps records of income and expenses, and files one return a year. A partnership adds a few steps: the partnership itself is registered with HMRC, one partner is named to file the partnership return, and every partner still files their own personal return. Keeping separate bank accounts and clear records of who has put in and taken out what makes the year-end far easier.

Both are affected by Making Tax Digital for Income Tax, which phases in from 2026 to 2028 depending on income. For now, partnership profits are outside the rules, but a sole trader's self-employment income can bring them in, and a partner's other self-employment or property income may count too.

Decisions, money and what happens when someone leaves

A sole trader makes every decision and keeps every pound of profit. A partnership shares both. Unless the partners agree otherwise in writing, the default legal rules apply, which broadly mean equal shares of profit and an equal say, regardless of who put in more money or works more hours. A partnership can also come to an end when a partner leaves, retires or dies, unless the agreement says what should happen instead.

A written partnership agreement is not a legal requirement, but it is the single most useful document a partnership can have. It should cover how profits are shared, how much each partner puts in, who decides what, how a partner can leave and how disputes are settled. It is far easier to agree these things at the start than in the middle of a disagreement.

Which suits you?

Being a sole trader usually suits you if you are working alone, want the simplest set-up and are happy to make every decision yourself. A partnership usually suits you if you are going into business with someone you trust, where you each bring skills or money and want to share both the work and the reward. Many businesses start as one and change later: a sole trader takes on a partner, or a partnership becomes a limited company once profits or risks grow. None of these moves is difficult, but each has tax consequences worth planning.

Can I go into partnership with my husband, wife or partner?

Yes. Each of you is then taxed on your own share of the profit. The profit split should reflect what each person actually does and contributes, so it is worth taking advice before deciding how to divide it, particularly if one of you has other income or a different tax position.

Do I need a partnership agreement?

The law does not require one, but without it the default rules apply, and they may not match what you intended. If you are thinking about a partnership, we can help you work out what the agreement should cover and refer you to a solicitor to draw it up.

Not sure whether to go it alone or bring someone in?

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