Business Partnerships for UK Trade Businesses — Going Into Business With Someone in 2026

The Three Legal Structures for a Trade Partnership

Before you start trading together, you need to choose a legal structure. There are three main options for UK trade businesses in 2026. Each comes with different levels of liability, admin, and tax treatment.

1. Ordinary Partnership (the default)

If two people start working together without formally setting anything else up, this is what you become. No registration with Companies House is required — you just notify HMRC that you're operating as a partnership. It's the simplest option on paper, but it carries the biggest risk: joint and several liability.

Under the Partnership Act 1890, every partner is personally liable for all the debts of the partnership — including debts created by the other partner without your knowledge. If your business partner signs a contract that goes wrong, borrows money you didn't know about, or causes a costly dispute with a client, you are personally liable for the full amount. Not just your share — all of it. This is the risk that most tradespeople going into partnerships don't understand until it's too late.

Profits are taxed as self-employment income for each partner. Each files their own Self Assessment. Straightforward, but potentially expensive at higher profit levels (more on this below).

2. Limited Liability Partnership (LLP)

An LLP is registered at Companies House and gives each partner limited liability — you're only liable up to the amount you agreed to contribute to the business, not every debt the other partner creates. Annual accounts are filed publicly at Companies House, so there's more admin and less privacy than an ordinary partnership, but significantly more protection.

LLPs are taxed similarly to ordinary partnerships — profits pass through to each partner as self-employment income — so there's no Corporation Tax advantage. The LLP structure is more common in professional services (law firms, accountants) than in trades, but it's worth knowing it exists if the liability protection matters and you don't want a Ltd company structure.

3. Ltd Company with Multiple Directors and Shareholders

This is the most common and most flexible structure for trade businesses going into business together in 2026. You form a limited company, both become directors, and you each hold shares. The company is a separate legal entity — it can own assets, enter contracts, and take on liabilities in its own name. Your personal liability is limited to the value of your shares.

You can have different share classes, allowing different dividend entitlements without changing voting rights. Profit is extracted as a mix of salary and dividends, which is more tax-efficient than self-employment income at higher profit levels (again, more on this below). There's more setup and ongoing admin — annual accounts, confirmation statements, Corporation Tax returns — but the combination of limited liability and tax efficiency makes it the go-to structure for most trade businesses above a modest turnover.

Why You Must Have a Written Partnership Agreement

If you operate as an ordinary partnership without a written agreement, the Partnership Act 1890 fills in the gaps. That's a 135-year-old piece of legislation written for a completely different era, and its defaults are not designed for two tradespeople trying to grow a business together.

Under the 1890 Act defaults: profits are split 50/50 regardless of how much work each partner actually does; any partner can bind the business to contracts; and you cannot remove a partner without dissolving the entire partnership. Even if you operate as a Ltd company, if you don't have a shareholders' agreement, company law defaults apply — and those defaults are equally unsuited to a working trade partnership.

A written agreement drafted by a solicitor costs between £500 and £1,500. That is some of the best money you will spend in your business. It should cover:

• Profit share percentage — exact figures, not vague intentions
• Decision-making authority — who can agree to what without the other's sign-off
• Contract signing threshold — e.g. either partner can commit to work up to £5,000; anything above requires both to agree
• Exit mechanism — what happens if one partner wants to leave, including how the business is valued and who has first right of refusal to buy the other out
• Death or incapacity — what happens to the deceased or incapacitated partner's share
• Non-compete clauses — can an exiting partner set up a competing business and contact your existing customers?
• Ownership of assets — who owns the van, tools, equipment, intellectual property, and customer list if the partnership ends

Do not skip this because you trust the other person. Everyone who has been through a difficult partnership breakup wishes they'd had a proper agreement in place from the start. The agreement is not a statement of distrust — it's the foundation that lets you both operate confidently.

Profit Sharing — Common Structures

There is no single right answer on profit sharing. The right structure depends on what each partner contributes in time, capital, skills, and risk. Here are the most common approaches:

50/50

Simple and intuitive — but only fair if both partners genuinely contribute equally in hours, effort, and capital. If one partner does more site work, brings stronger qualifications, or has invested more in tools and equipment, a straight 50/50 often breeds resentment within the first year. Be honest with yourselves about whether the contributions are truly equal before defaulting to this.

Skills-based split (e.g. 60/40)

If one partner brings significantly more technical expertise — a gas-safe qualification, an NICEIC accreditation, a specialist certification — that partner commands a larger share of the profit. The split should reflect the market value of those skills and the premium they allow you to charge.

Investment-weighted

If one partner puts in significantly more startup capital — buying the van, funding the tools, covering the first few months of operating costs — it's reasonable to weight the profit share in their favour until that investment is recovered, then revert to a different split.

Salary-first, then profit split

This is often the fairest structure for trade businesses where the partners have different roles. Each partner takes a market-rate salary for the work they do — one partner might take £35,000 as the on-site technical lead, the other £28,000 for managing quotes and customer relations — and then the remaining profit after those salaries is split, perhaps 50/50, perhaps differently. This approach separates the reward for doing the work from the reward for owning the business, which removes a major source of friction if the workloads diverge over time.

Decision Making and Roles

The clearest partnerships are the ones where each partner knows exactly what they're responsible for and what requires the other's input. A common and workable split for trade businesses is: one partner leads the technical and on-site work, the other leads admin, quoting, and customer relations. That doesn't mean the first partner never speaks to customers — it means there's a primary owner for each function.

Regardless of how you split day-to-day responsibilities, certain decisions should always require both partners to agree. Define these in your written agreement. Common examples:

• Taking on new employees or subcontractors
• Capital purchases above an agreed threshold (e.g. a new van, major plant equipment)
• New long-term contracts or retainer arrangements
• Significant price changes
• Taking on new premises or committing to a lease
• Borrowing money in the business's name

The threshold for what needs joint agreement should be low enough to protect both partners, but high enough that you're not calling each other about every £200 purchase. Set a sensible number — perhaps £2,000 or £5,000 — and revisit it annually as the business grows.

When Things Go Wrong — Dissolution and Disputes

Partnership dissolution is one of the most legally and financially messy situations in small business. Even partnerships that start with the best intentions can break down — differing ambitions, one partner working less, personal circumstances changing, or simply growing apart. The three common flashpoints:

• One partner wants out — what are they entitled to, and at what valuation?
• Both partners want the business — who gets to keep trading under the existing name with the existing customers?
• Clients and debts are disputed — which partner takes responsibility for which outstanding jobs and liabilities?

Without a written agreement, all of these become expensive legal disputes that can consume more money than the business is worth.

The best protection is to build a buy-out mechanism into your agreement from the start. This should specify: how the business is valued if one partner wants to exit (e.g. a multiple of the last 12 months' net profit, agreed by an independent accountant), who has first right of refusal to buy the other out, and over what timeframe payment can be made. Agreeing this when both partners are motivated and aligned — before any dispute — is dramatically easier than negotiating it in the heat of a breakdown.

Ltd Company vs Partnership for Tax

The tax treatment of your structure matters more as the business grows. Here's the practical picture for 2026:

In an ordinary partnership, profits are taxed as self-employment income for each partner. Once combined personal profits push partners into the 40% income tax band, the marginal cost of each additional pound of profit is high. Both partners also pay Class 4 National Insurance on their share of profits above the threshold.

A Ltd company pays Corporation Tax on its profits — currently 19% for profits up to £50,000, rising to 25% for profits above £250,000, with marginal relief in between. Two directors can each take a salary up to their personal allowance (currently £12,570) — which is tax-free and reduces the company's taxable profit — and then extract further profits as dividends, which are taxed at lower rates than income (8.75% in the basic rate band, 33.75% in the higher rate band in 2026). Each director optimises their own tax position independently.

The general rule of thumb: if the combined profits of the business exceed roughly £50,000 per year, a Ltd company structure is likely to be more tax-efficient than a partnership. Below that level, the admin costs and accountancy fees of running a Ltd company may outweigh the tax saving. Get your accountant to run the numbers for your specific situation — the right answer depends on how much you each need to draw from the business each year.

Common Partnership Mistakes in Trades

These are the mistakes that come up time and again when trade business partnerships go wrong:

Going 50/50 on a handshake

No written agreement means the Partnership Act 1890 governs your business. You may not find out what that means until it's too late and the legal bills start arriving.

One partner does most of the work

This is the most common cause of partnership resentment. If the profit split doesn't reflect the actual contribution of each partner, the partner doing more will eventually become resentful — and rightfully so. The salary-first model (above) addresses this directly.

No clarity on customer relationships

Whose customers are they — the business's, or one partner's? If the partnership breaks up, can both partners contact existing customers? Without a clear agreement on this, both will try to retain the customers, creating a damaging situation for everyone including the customers themselves.

Shared bank account with no financial controls

A joint business account where both partners can spend freely without the other's oversight is a recipe for disputes. Implement basic financial controls from day one: a spending threshold that requires both to authorise, regular monthly reviews of the accounts together, and separate visibility of what each partner is drawing.

One partner signing contracts the other doesn't know about

In an ordinary partnership, any partner can bind the business to a contract. If your business partner signs a three-year maintenance contract with a commercial client at a fixed price that turns out to be loss-making, you are jointly liable. The written agreement and the contract-signing threshold (above) are your protection here.

Getting the Right Help

Two professionals are worth paying for when setting up a trade business partnership:

A solicitor to draft the partnership agreement or shareholders' agreement. Budget £500–£1,500. Do not use a generic template from the internet — the agreement needs to reflect your specific situation, including your assets, your roles, and your agreed exit mechanism. A good solicitor will also flag issues you haven't thought of.

An accountant to advise on the best structure for your tax position and ongoing financial management. Both partners can use the same accountant for business advice, but be aware that if the partnership breaks down and there is a dispute, the accountant cannot act for both sides. Having separate legal advisers from the start avoids this conflict.

The total cost of getting the structure right at the start — solicitor, accountant, Companies House registration if applicable — is likely to be between £1,000 and £3,000. That is a fraction of what it costs to unpick a badly structured partnership when things go wrong. Every tradesperson who skipped the agreement because "we trust each other" and later had problems wishes they hadn't.

Go in with your eyes open, get the agreement in writing, and build the financial discipline into the partnership from day one. A well-structured partnership can genuinely accelerate your business — the legal and financial foundations are what make that growth sustainable.