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startup founders agreement uk

Founders Agreement for UK Startups

A startup founders agreement UK is the document that defines how your founding team actually works — who owns what, who does what, and what happens when things go wrong. Most early-stage teams skip it because they trust each other. That trust is real, but it is not a substitute for written terms. Without a founders agreement, equity splits are ambiguous, IP ownership is unclear, and a departing co-founder can walk away with a chunk of your company before you have even raised a round. UK company law does not fill these gaps automatically. This page explains what a founders agreement should cover for a UK startup, what to watch out for in standard templates, and how Atornee helps you draft or review one without paying solicitor rates for a first draft. If your situation involves complex equity structures, investor-ready vesting schedules, or existing disputes, you should involve a solicitor. For most early-stage teams getting the basics right, Atornee is a practical starting point.

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Why this matters

Most UK founding teams have the equity conversation once, agree a split on a call, and move on. Nobody writes it down properly. Then six months later one founder goes part-time, or leaves entirely, or a disagreement surfaces about who controls product decisions. At that point you are negotiating under pressure with no written baseline to refer to. A founders agreement is not about distrust — it is about removing ambiguity before it becomes expensive. The specific pain here is that UK startup templates online are often US-derived, miss UK company law requirements, and do not reflect how Companies House filings interact with your internal agreements.

The Atornee approach

Atornee lets you describe your founding setup in plain language and generates a UK-specific founders agreement draft you can actually read and edit. It flags the clauses that matter most for your structure — vesting, IP assignment, decision-making thresholds, and what happens if a founder exits. You are not getting a generic template. You are getting a draft shaped around your inputs, with explanations of why each clause is there. You can also paste in an existing draft and ask Atornee to review it for gaps. It is not a replacement for a solicitor when stakes are high, but it is a faster and cheaper way to get to a solid first draft.

What you get

A UK-specific founders agreement draft built around your actual equity split, roles, and company structure — not a US template with the currency changed
Plain-English explanations of key clauses including vesting schedules, IP assignment, reserved matters, and founder exit provisions
Identification of missing protections in existing drafts — useful if a co-founder has sent you something to sign
Guidance on how your founders agreement interacts with your articles of association and any shareholders agreement you will need later
A document you can take to a solicitor for final review without paying for the drafting stage from scratch

Before you sign checklist

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1. Agree your equity split and roles in writing between founders before you start drafting — Atornee works from your inputs, not assumptions
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2. Decide whether you want vesting on founder shares and over what period — four years with a one-year cliff is common for UK startups seeking investment
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3. Confirm who created what IP before the company was incorporated — pre-incorporation IP needs explicit assignment into the company
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4. List which decisions require unanimous founder agreement versus majority — this becomes your reserved matters clause
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5. Agree what happens to a founder's shares if they leave voluntarily, are asked to leave, or die — good leaver and bad leaver provisions are essential
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6. Check whether your articles of association already contain any shareholder provisions that might conflict with your founders agreement
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7. Once you have a draft, have a UK solicitor review it before all founders sign — especially if you are planning to raise investment within twelve months

FAQ

Is a founders agreement legally binding in the UK?

Yes, if it is properly drafted and signed by all parties it is a legally binding contract under English law. The key requirements are offer, acceptance, consideration, and intention to create legal relations — all of which are present in a well-drafted founders agreement. That said, some provisions, such as IP assignment into a limited company, may need to be executed as a deed to be fully effective. A solicitor can confirm the execution requirements for your specific situation.

Do I need a founders agreement if we are just two friends starting out?

Especially then. Disputes between co-founders who are also friends are more common than disputes between strangers, partly because the initial conversation about roles and equity is often too informal. A founders agreement does not signal distrust — it signals that you are both serious about the business. It also protects the friendship by removing ambiguity before it becomes a source of conflict.

What is the difference between a founders agreement and a shareholders agreement?

A founders agreement is typically signed at or near incorporation and covers the founding team's relationship, roles, equity, vesting, and IP. A shareholders agreement is a broader document that governs all shareholders — including investors — and is usually put in place at or after a funding round. Your founders agreement should be drafted with the eventual shareholders agreement in mind, so the two do not conflict. Some founders combine both into a single document from the start, but this is less common at the pre-seed stage.

Can I use a free founders agreement template from the internet?

You can, but be careful. Many free templates are US-derived and do not reflect UK company law, Companies House requirements, or how English contract law treats certain provisions. Specific issues include IP assignment mechanics, share vesting under UK tax rules, and good leaver or bad leaver definitions that interact with your articles of association. Using a template as a starting point is fine — just make sure it is reviewed against your actual UK structure before you sign it.

What should a UK founders agreement always include?

At minimum: equity split and any vesting schedule, roles and responsibilities, IP assignment to the company, decision-making rules and reserved matters, what happens when a founder leaves (good leaver and bad leaver provisions), confidentiality obligations, and a governing law clause specifying English law. If you are based in Scotland, Scottish law may apply instead and there are some differences worth noting.

When should I involve a solicitor rather than using Atornee?

Use a solicitor if you are raising investment within the next six months and need investor-ready documentation, if there is already a dispute between founders, if the IP involved is complex or high-value, or if any founder is based outside the UK and cross-border issues arise. Atornee is well-suited to getting you a solid draft quickly and affordably — but for high-stakes or complex situations, a qualified solicitor should review or lead the process.

Related Atornee Guides

Cheap Contract Solicitor Alternative (UK)

Useful if you want to understand how Atornee fits into your broader contract workflow beyond the founders agreement.

Cheap Solicitor for NDA (UK)

Founders often need an NDA alongside their founders agreement when sharing sensitive information with early hires or advisors.

Atornee Use Cases

See how other UK founders and business roles use Atornee across different legal document types.

External References

GOV.UK Business and Self-employed

Official UK guidance on setting up and running a business, including company formation requirements relevant to founders.

UK Legislation

Primary statutory reference for the Companies Act 2006 and other legislation that underpins UK founders agreements.

Trust & Verification Policy

Authored By

A

Atornee Editorial Team

UK Startup Contract Research

Reviewed By

C

Compliance Review Desk

UK Business Legal Content QA

Last reviewed on 3/4/2026

"This content is based on analysis of common UK founders agreement structures, Companies Act 2006 requirements, and the practical gaps that early-stage UK startups encounter when using generic templates. It reflects patterns observed across UK startup legal documentation and founder disputes at the pre-seed and seed stage."

References & Sources