A well-drafted co-founder agreement protects everyone involved by setting clear expectations from day one. It outlines how equity, responsibilities, decisions and departures will be handled, reducing the risk of costly disputes later.
This guide explains the essential clauses for a UK co-founder agreement, focusing on equity vesting, roles, decision making, exit clauses and an overview of legal templates. Use it as a starting point and always consult a solicitor to tailor the document to your specific situation.
Why a Co-Founder Agreement Matters
Many early-stage teams begin with trust and enthusiasm but later face disagreements over contributions, control or what happens if someone wants to leave. A co-founder agreement records the rules you all agree to follow. It is not a replacement for company articles or a shareholders’ agreement but works alongside them.
Putting the agreement in place early forces honest conversations about expectations. It also reassembles a practical reference point when pressure rises. Founders who delay often regret it when relationships become strained.
Equity Vesting and Share Ownership
Equity vesting is one of the most important clauses. It determines when founders actually own their shares rather than simply being promised them. A common approach is a four-year vesting period with a one-year cliff. This means no shares are owned until the first anniversary, after which they vest monthly or quarterly.
Include provisions for what happens to unvested shares if a founder leaves. Good leaver and bad leaver definitions are useful here. A good leaver (for example, someone who becomes seriously ill) might keep or accelerate some equity. A bad leaver (someone who is dismissed for misconduct) might lose unvested shares and sometimes even face a compulsory transfer of vested shares at a discounted price.
Decide upfront how much equity each founder receives and whether it reflects current contributions or future commitments. Document any promises about sweat equity versus cash investment. Remember that share structures and tax implications change; always check the latest guidance on GOV.UK and speak to an accountant or solicitor.
Defining Roles and Responsibilities
Clearly set out each founder’s day-to-day role. List specific responsibilities such as product development, marketing, sales, operations or finance. This avoids overlap and makes it easier to measure performance against expectations.
Include a clause requiring regular review of roles, perhaps every six or twelve months. Business needs evolve quickly in early-stage e-commerce or tech ventures. A founder who begins as head of product may later need to focus on fundraising or customer support.
Consider adding a requirement for founders to commit a minimum number of hours per week, especially if some are still running side hustles. State whether full-time dedication is expected after a certain milestone, such as securing first revenue or completing an MVP. These details reduce ambiguity when workloads become uneven.
Decision Making and Governance
Decide which decisions require unanimous consent, majority vote or can be made by an individual founder. Typical reserved matters include issuing new shares, taking on debt above a certain level, hiring senior staff, changing the business direction or selling the company.
Appoint one founder as the day-to-day decision maker for operational matters to avoid constant meetings. Set out a dispute resolution process, such as mediation before litigation. This can save significant time and legal costs if tensions rise.
Include rules around board meetings if you have appointed directors. Even in a small company, documenting how often you meet and how decisions are recorded creates a professional paper trail useful for investors, banks or future due diligence.
Exit Clauses and What Happens on Departure
Exit clauses cover voluntary departure, dismissal, death, disability or a founder wanting to sell shares. Include a right of first refusal so remaining founders can buy departing shares before they are offered to outsiders.
Define valuation methods for share transfers. Common approaches include using the last funding round price, a formula based on revenue multiples or an independent valuation. State who pays for the valuation and any payment terms, such as instalments over time rather than a lump sum.
Consider non-compete and non-solicitation periods. These are usually limited in duration and geographic scope to remain enforceable. A founder who leaves should not immediately set up a directly competing e-commerce business and contact all your customers. Check current legal limits through GOV.UK or a solicitor because rules around restraint of trade evolve.
Legal Templates and Next Steps
Several free or low-cost templates are available from reputable sources such as Companies House guidance, law firm websites and platforms like Seedrs or Gust. These provide a useful starting framework but are not a substitute for personalised legal advice. Download a template, customise it with your specific terms, then have a commercial solicitor review it.
Once the agreement is finalised, all founders should sign it and keep signed copies. Update the document when significant changes occur, such as a new funding round or shift in roles. Treat the agreement as a living document that grows with the business.
Founders based in West Yorkshire or looking for support can explore local resources. Loomworks in Liversedge offers selected early-stage teams free desks, a registered address and mentoring without taking fees or equity. Such environments can provide practical help while you finalise your co-founder agreement and company setup.
Common Pitfalls to Avoid
One frequent mistake is assuming verbal agreements will be remembered the same way by everyone. Document everything. Another is copying a template without understanding each clause. Vague wording leads to disputes.
Avoid making the agreement overly rigid. Build in some flexibility for the fast-changing environment of UK startups. Finally, do not treat the co-founder agreement as a one-off task. Review it at least annually or after any major milestone.
Frequently asked questions
Do I need a co-founder agreement if we are friends?
Yes. Even close friends can disagree when money, stress or differing visions arise. A written agreement sets clear rules and protects the relationship by removing ambiguity about equity, roles and exits.
What is a vesting cliff and why use one?
A vesting cliff is a period, often one year, during which no equity is owned. It protects the business if a founder leaves early. After the cliff, equity vests gradually, rewarding continued commitment.
Can we change the agreement after signing?
Yes. Any changes should be made in writing and signed by all parties. Major updates may also require updating your company articles or shareholders’ agreement. Regular reviews help keep the document relevant.
Should we include intellectual property ownership in the agreement?
Yes. Make sure any code, designs, branding or product ideas created before or during the venture are assigned to the company. This avoids disputes if a founder leaves and claims ownership of key assets.
Is a co-founder agreement legally binding?
It can be made legally binding if properly drafted, signed and supported by consideration such as the mutual promises of the founders. Courts generally uphold clear, fair agreements. Always have a solicitor check it.
Related reading: Beginner guide to importing products into the UK, Launching a subscription ecommerce business in the UK, Running a successful crowdfunding campaign in the UK. Browse all starting a business guides or apply to Loomworks.