No Partnership Agreement? Why Common‑Law Rules Put You at Risk

Thinking about starting a business with a friend, relative or colleague? Perhaps you’ve already begun trading as a team and share the day-to-day decisions, workload, and (hopefully) the profits. But let’s pause for a moment: do you actually have a written partnership agreement in place? If not, you’re not alone-many business partnerships in England operate without a formal contract. After all, it might feel unnecessary when you’re just getting started or working with people you trust. But relying on handshake deals or informal chats can open you up to big risks down the line, because English law will fill the gap with something called "partnership common law". In this article, we’ll break down what happens if you don’t have a partnership agreement, why common-law rules might not work as you expect, and how you can put strong legal foundations in place to protect your business-and your relationships-from day one.

What Is a Partnership-and How Is It Legally Formed?

The word “partnership” gets thrown around a lot, but in English law, it has a very specific meaning. Under the Partnership Act 1890, a partnership exists when two or more people (or companies) carry on a business together with a view to making a profit. The key thing to note? You do not need to sign anything or register anywhere for a partnership to exist. If you and another person start acting in a way that looks and feels like a business partnership-sharing responsibilities, profits, losses, and decisions-a partnership is automatically recognised under law. That’s different from setting up a company (Ltd) or a Limited Liability Partnership (LLP), both of which require formal registration with Companies House and provide a different level of protection. In a general partnership, the law treats you and your partners as the business itself. There’s no legal separation-just collective, personal responsibility for how things run.

Why Does a Partnership Agreement Matter?

You might be wondering: “If my business is already a partnership under the law, do I really need anything in writing?” The answer is a resounding yes. A partnership agreement is more than just a formality. It’s a tailored contract between you and your partners that spells out exactly how your business will operate, dividing up:

• Profit and loss sharing
• Decision-making powers
• Partner responsibilities
• How new partners join or existing partners leave
• Resolution of disputes
• What happens if someone dies, needs to exit, or the partnership dissolves

A clear, written agreement means you’re setting the rules for your business. Otherwise, English law will step in and impose a set of “default rules” under the Partnership Act 1890, which might not be what you expected or what actually works for your situation.

What Happens If There Is No Partnership Agreement?

When there’s no formal partnership agreement, or if your agreement is silent about a particular issue, your partnership will automatically be governed by the standard-or “implied”-terms set out in the Partnership Act 1890. On the surface, this sounds straightforward enough. But these default rules are blunt instruments that may not suit the realities of your business or your intentions with your partners. Let’s take a look at some of the most crucial areas that can cause problems if left to the common law defaults.

How Are Profits and Losses Shared?

Under the Partnership Act, all profits and losses are shared equally between partners, regardless of who invested more money, put in more work, or brought in more clients. This can create resentment if one partner feels they’re shouldering a bigger load or deserve a greater share. If you want profits to be split based on contribution, role, hours worked, or any other factor, you need to set that out in writing. Otherwise, the law assumes a 50/50 (or equal) split, which can be both unfair and problematic in practice.

Who Gets to Make Decisions?

Default rules say every partner has equal say in running the business. All partners must agree unanimously on key decisions: hiring staff, entering major contracts, borrowing money, or selling the business. This sounds democratic, but in reality, it can stall progress or lead to deadlock if opinions diverge or partners simply cannot get on the same page. A written agreement lets you allocate different levels of authority or make provision for what happens if there’s a tie or ongoing disagreement-saving a lot of headaches, delays, or wasted opportunities.

What If Someone Wants to Leave (or Must Leave)?

With no agreement, a partner can usually leave at any time with little notice, or even force the dissolution of the entire partnership. This means your whole business could be derailed overnight because one partner changes their mind or faces a life event. If a partner dies or is unable to continue, the default law often requires the partnership to dissolve automatically, creating uncertainty and disruption for everyone else involved. If you want continuity or control over exits, you need bespoke rules in writing.

How Are Disputes Handled?

The common law doesn’t say much about how partners should resolve disagreements beyond the basic voting rules. There are no set mechanisms for dispute resolution, mediation, or bringing in independent advice, so seemingly minor fallouts can quickly escalate and jeopardise your business. A tailored partnership agreement can include step-by-step processes or timelines for managing conflict, helping you de-escalate disputes before they become unmanageable.

What Does Common Law ‘Partnership’ Really Mean For You?

Let’s imagine a typical scenario. You and a partner run a creative agency with no formal agreement. You’ve both invested, but one of you built the website, hustled for clients, and manages most projects. Yet, when profits come in, the law says you must split them down the middle-even if that feels unfair to the “busier” partner. Now suppose your partner wants to retire (or just loses interest). Because there’s no agreement, they can walk away and, in doing so, may trigger the dissolution of the entire business, leaving you struggling to reboot or renegotiate. Or worse, if there’s a financial dispute, you might both be personally liable for business debts-putting your own savings, property, and assets at risk. Without a written contract, you also miss out on protections such as:

• Intellectual property (IP) ownership-who owns client lists, branding, websites etc?
• Procedures for bringing in new partners, or removing someone who’s not pulling their weight
• Ability to set non-compete or confidentiality terms
• Clear rules for drawing money out, borrowing, or reinvesting profits

The bottom line? Relying on the default “partnership common law” puts you at the mercy of 130-year-old legal principles that simply aren’t designed for modern business.

Key Risks of Not Having a Partnership Agreement

Operating without a clear, written agreement is one of the most common small business mistakes-and one of the easiest to avoid. Here are the top risks you face:

• Personal liability: All partners are jointly and severally liable for business debts and obligations. One partner’s actions can expose everyone.
• Unfair profit/loss sharing: The law rarely reflects your actual financial input or sweat equity unless you spell it out.
• Unanimous decision-making: Day-to-day operations can grind to a halt if you disagree, stalling business growth.
• No control over exits: Any partner can leave-and potentially dissolve the business-without notice or compensation.
• Disputes and uncertainty: There’s no mechanism for resolving arguments, making things very messy if relationships sour.
• Vulnerability on key issues: Gaps in areas like IP ownership, confidentiality, or restrictive covenants mean your hard work (and secrets) could walk out the door.

If things go wrong, sorting out these issues can become costly, time-consuming, and damaging for your business and your personal relationships.

How You Can Protect Your Partnership-and Your Future

The good news is, these risks are entirely avoidable. Here’s how:

1. Draft a Tailored Partnership Agreement: Invest in a properly-drafted, bespoke partnership agreement from the outset. This should cover profit sharing, roles and responsibilities, dispute resolution, exit mechanisms, and anything else that matters to you. Avoid generic templates-they’re unlikely to reflect your real-world needs or comply with current law.
2. Clarify Key Issues Early: Use your agreement to address areas like:
   • How much each partner invests, and how returns are divided
   • Day-to-day decision authority and voting thresholds
   • Procedures for new partners joining or old partners leaving
   • Continuity arrangements in the event of illness or death
   • Intellectual property, confidentiality, and restrictive covenants
3. Update When Things Change: Partnerships evolve-so should your agreement. Review and update the contract as new partners join, the business changes direction, or major events occur.
4. Get Legal Advice: If in doubt, invest in expert legal help. A legal advisor can walk you through your options and make sure your business-and your interests-are properly protected.

A good partnership agreement is your roadmap for handling the ups and downs of business life-giving you certainty, flexibility, and the best chance of success.

How Does a Partnership Agreement Work in Practice?

Let’s say your business has grown: you’re ready to bring in a new partner, or one founder wants to step back. If you’ve got a partnership agreement:

• You know how to value the departing partner’s share and how the process works
• The incoming partner’s rights and obligations are clearly outlined
• The business continues smoothly-no disruption, confusion, or legal wrangling

Or imagine a dispute crops up over contracting a new supplier. Your agreement will set out how disputes are dealt with, potentially requiring mediation before escalation-helping you focus on solutions, not squabbles. For those thinking of scaling, the right legal structure also means you’ll be able to plan for future growth, attract investors, or even convert to a company or LLP later if needed.

Alternative: Considering a Different Business Structure?

If the default general partnership setup feels too risky, you might consider other options. For example:

• Limited Liability Partnership (LLP): Offers partnership-like flexibility, but gives each member some protection from personal liability for business debts. Formal incorporation is required-see our LLP guide.
• Private Limited Company (Ltd): Provides personal asset protection and is better suited for larger businesses or those looking to raise capital and scale.

If you’re not sure which business structure is best, take a look at our detailed comparison of structures.

What Legal Documents and Resources Should You Consider?

If you’re running a partnership, you’ll need more than just a handshake and a business plan. Here are some essentials:

• Partnership Agreement
• Shareholder or LLP agreement (if you change structure)
• Other essential contracts covering employment, suppliers, clients, and online operations
• Policies for privacy and data protection if you handle client data
• Registered intellectual property-trade marks, copyrighted assets, or patents (if relevant)

Getting your legal documents reviewed and drafted by a lawyer can prevent major headaches and costly disputes as your business grows.

Key Takeaways

• A partnership exists in law the moment you run a business together for profit-even without paperwork or registration.
• Without a written partnership agreement, your business is governed by the default terms of the Partnership Act 1890, which often don’t reflect your actual intentions.
• Main risks include unfair profit splits, unanimous decision requirements, partner exits dissolving the business, and personal liability for debts.
• A well-drafted partnership agreement is essential. It gives you clarity, fairness, and control over profits, roles, disputes and exits.
• Consider tailored legal help to put the right agreement-and supporting documents-in place right from the start.
• Review your structure periodically. As your business grows, you might be better suited to an LLP or Ltd company for extra legal protection.

If you’d like some help setting up a partnership, drafting a partnership agreement, or just want to chat about your legal options, reach out to our friendly team at team@sprintlaw.co.uk or call 08081347754 for a free, no-obligation chat. We’ll help you get protected from day one-so you can focus on growing your business together with confidence.