The best time to discuss founder expectations is before a missed milestone, a funding deadline or a departure turns an assumption into a dispute. A founders’ agreement is not evidence of distrust. It is a way to identify what the founders believe they have agreed and to test whether the company’s legal documents and records actually implement it.

For the wider document roadmap, read What Legal Documents Does a UK Startup Need?.

Founder agreement clauses at a glance

What is a founders’ agreement in the UK?

There is no single statutory document called a “founders’ agreement”. The name describes the commercial purpose of the contract rather than a fixed legal form. Depending on the company and the drafting, it may resemble an early shareholders’ agreement, a collaboration agreement or a combination of governance, equity and service commitments.

A founders’ agreement is usually private and binds only the parties to it. By contrast, a company’s articles form part of its constitution and bind the company and its members under section 33 of the Companies Act 2006. The articles are filed or otherwise available through Companies House, while the founders’ agreement is not normally filed.

The labels therefore matter less than the documents working together. If a transfer restriction, voting rule or leaver mechanism needs to operate at company level, it may also need to appear in the articles, share terms, resolutions or separate transfer documents.

For assistance with incorporation, bespoke articles, ownership structures and founder equity, see Business Formation and Business Structure and Acquiring Ownership in a Business and Equity Finance.

Is a founders’ agreement legally required?

Usually no. A UK private company can exist without a founders’ agreement. However, the absence of a statutory requirement does not mean the founders have addressed the commercial and legal risks created by shared ownership.

A written agreement is particularly useful where two or more people are contributing different combinations of cash, time, intellectual property, contacts or expertise; where the founders expect equity to depend on continued participation; or where decisions may become difficult if the relationship changes.

Founders’ agreement, articles or shareholders’ agreement?

Core clauses in a UK founders’ agreement

1. Parties, business and purpose

Identify the founders accurately, describe the business and decide whether the company should also be a party. The company may need direct rights to enforce IP, confidentiality, transfer or other obligations, but making it a party can also create corporate approval and conflict considerations.

2. Equity ownership and founder contributions

The agreement should reflect the actual ownership position rather than an informal percentage discussed before incorporation. It should record what each founder is expected to contribute and distinguish between shares already issued, shares to be issued, options and non-equity compensation.

• The number and class of shares currently held or proposed.
• Cash, assets, intellectual property, introductions or work expected from each founder.
• Whether future funding or an employee option pool will dilute the founders.
• What happens if a contribution is late, incomplete or no longer required.
• Whether any founder has separate rights to salary, fees or expenses.

The company must keep an accurate register of members, and changes to the share structure may require approvals and Companies House filings. GOV.UK also explains the steps involved when a private company changes or issues shares.

3. Roles, authority and time commitment

Titles alone rarely define responsibility. The agreement should make clear who leads product, sales, finance, operations, fundraising or other core functions, how much time each founder is expected to commit and which decisions each person can make without further approval.

• Full-time, part-time or transitional commitments.
• Authority to sign contracts, hire staff or spend company funds.
• Reporting, budgets and approval thresholds.
• Whether performance expectations are objective and reviewable.
• How remuneration or expenses are approved.

A founders’ agreement should not be the only document governing a founder’s work. Where a founder is an employee, director or service provider, a separate service or employment agreement may be needed.

4. Decision-making and reserved matters

The agreement should separate ordinary operational decisions from matters requiring enhanced approval. Reserved matters may include issuing shares, changing the business, borrowing above a threshold, selling material assets, entering related-party transactions or changing senior remuneration.

A 50/50 share split is not automatically a mistake, but it creates a clear need to plan for deadlock. A casting vote, mediation clause or buy-sell mechanism is useful only if it is legally and commercially workable in the company’s circumstances.

5. Vesting and founder leaver arrangements

Vesting is intended to align the amount of equity a founder keeps with continued contribution. In many UK founder structures, the shares are issued at the outset and the “vesting” is implemented through an obligation or option to transfer some or all unvested shares if the founder leaves. This is commonly described as reverse vesting.

The agreement should not simply state that unvested shares are “forfeited”. It should explain the legal mechanism, who can acquire the shares, the price, the approvals, the timetable and what happens if the departing founder does not cooperate.

Questions the vesting provisions should answer

• When does vesting begin, and is any service already completed credited?
• Is there a cliff before the first portion vests?
• Does vesting occur monthly, quarterly or on milestones?
• What events create good-leaver, bad-leaver or other categories?
• What happens to vested and unvested shares in each category?
• Is the price nominal value, original cost, fair value or another amount?
• Who has the call option or purchase right: the company, other founders or another permitted buyer?
• Does vesting accelerate on a sale, and is acceleration single-trigger or conditional on a further event?
• How will valuation, payment, transfer forms and registration be completed?

6. Good-leaver and bad-leaver definitions

Leaver labels can have major financial consequences, so the definitions should be precise. A broad clause that treats every voluntary resignation as misconduct may be commercially unacceptable and may be difficult to negotiate or enforce. Consider whether an intermediate category is needed for circumstances that are neither clearly “good” nor culpable.

The drafting should also state who decides the classification, whether the affected founder can participate in that decision, the evidence required and what dispute process applies.

7. Intellectual-property ownership and confidentiality

A startup should be able to show how the company acquired ownership or permission to use its software, designs, content, brand assets, inventions and know-how. Paying a founder or contractor does not necessarily transfer intellectual property.

Copyright created by an employee in the course of employment is generally addressed by section 11 of the Copyright, Designs and Patents Act 1988, but a founder is not automatically an employee and work may have been created before incorporation. A copyright assignment must generally be in writing and signed under section 90, and future copyright can be addressed under section 91.

• Identify background IP that remains personally owned and any licence granted to the company.
• Assign business IP created before incorporation or outside employment.
• Address future IP, moral rights, source materials and further-assurance obligations.
• Use confidentiality obligations alongside practical access and security controls.

StartWise currently includes an IP Assignment Agreement workflow. Readers who have already selected a static England-and-Wales document can also view the IP Assignment Agreement (Startups-UK) on Etsy. For broader support, see Protecting Your Business Name, Logo and IP.

8. Share transfers, founder departures and exits

The agreement should coordinate any right of first refusal, pre-emption, permitted transfer, compulsory transfer, tag-along, drag-along or sale-cooperation provisions with the articles and the company’s share procedures. Consider death, incapacity, bankruptcy, prolonged absence and a founder who stops contributing without formally resigning.

9. Restrictive covenants and non-solicitation

Confidentiality, non-solicitation, non-dealing and non-compete clauses may be considered, but they should protect a legitimate business interest and go no further than reasonably necessary in scope, duration and activity. The appropriate analysis can depend on the relationship and the wider transaction.

10. Deadlock, disputes and governing law

A dispute clause should provide a process that can actually be followed. Escalation to founder meetings, mediation or expert determination may help, but the agreement should also address urgent relief, the courts with jurisdiction and whether a buy-sell process is affordable and workable.

11. New founders, funding and replacement documents

The agreement should explain how a new founder joins and whether the document terminates or is replaced when investors or additional shareholders enter. An investment round may require amended articles, a subscription or investment agreement, shareholder approvals and a shareholders’ agreement.

For investment and ownership work, see Acquiring Ownership in a Business and Equity Finance and Raising Finance.

Founder vesting and UK tax: an issue that should not be overlooked

Founder shares can fall within the employment-related securities rules where the founder is or will be a director or employee. HMRC’s guidance states that there is no separate legislative concept that automatically removes “founders’ shares” from those rules.

Restrictions, undervalue, leaver provisions and later changes can affect tax treatment. A joint section 431 election may be relevant to restricted securities and normally has a short deadline. Share awards and other events may also require registration and annual reporting.

Review the current HMRC guidance on employment-related securities, the specific guidance on founders’ shares and the section 431 election conditions. Obtain tax advice before implementing or changing founder equity, rather than relying on the founders’ agreement alone.

Common mistakes in UK founders’ agreements

When should a founders’ agreement be signed or updated?

The discussion should begin as early as reasonably possible. Common trigger points include:

• Before or immediately after incorporation.
• Before valuable intellectual property is created or transferred into the company.
• Before shares are issued subject to vesting or leaver restrictions.
• Before a founder leaves paid employment elsewhere to work on the startup.
• Before external investment, due diligence or a material customer transaction.
• When a new founder joins, roles change or the company creates a new share class.
• When the existing document no longer matches the articles, cap table or actual working arrangements.

StartWise, a downloadable template or legal support?

For bespoke articles, complex founder equity, investment preparation or wider advice, contact Entrepreneur Legal UK or review the Business Formation and Business Structure service.

Frequently asked questions

Is a founders’ agreement legally binding in the UK?

It can be a binding contract if the usual requirements for a contract are satisfied and the relevant terms are legally enforceable. Particular provisions, such as restrictive covenants, compulsory transfers or company buy-backs, may require additional analysis and implementation.

Is a founders’ agreement filed at Companies House?

No. It is normally a private contract. However, related actions such as issuing shares, amending the articles or changing the share structure can require company records, resolutions and Companies House filings.

Is a founders’ agreement the same as a shareholders’ agreement?

Not necessarily. “Founders’ agreement” describes the early founder relationship, while a shareholders’ agreement usually governs shareholders more broadly. The documents can overlap, and some businesses use a shareholders’ agreement among the founders from the outset.

Can a founders’ agreement include vesting?

Yes, but the schedule must be supported by workable transfer, option or buy-back provisions, the articles, approvals, share records and tax work. Writing that shares are simply forfeited is not enough.

Can the company buy back a departing founder’s shares?

Potentially, but a company purchase of its own shares must comply with Part 18 of the Companies Act 2006 and the company’s articles. The agreement should not promise an unlawful or unfunded buy-back.

Should founders split equity 50/50?

There is no universal answer. A 50/50 split may be appropriate, but the founders should separately address contributions, authority, deadlock, vesting, future dilution and what happens if one founder leaves.

Does a founders’ agreement transfer intellectual property?

It can contain assignment language, but the wording and execution must satisfy the requirements for the relevant rights. A separate IP assignment is often helpful for pre-incorporation or specifically identified IP.

Do founder shares create tax issues?

They can. Founder shares may be employment-related securities, and restrictions or undervalue can affect tax treatment. Tax valuation, section 431 elections and ERS reporting should be considered promptly.

Can the agreement be changed later?

Usually yes, in accordance with its amendment provisions and with the consent required from the parties. Related articles, resolutions and share documents may need to be changed at the same time.

Does StartWise provide legal advice?

No. StartWise provides guided, AI-assisted document drafting. Lawyer review, legal consultations and bespoke services are separate and are provided only where expressly agreed.

Final founder-agreement checklist

• Confirm the actual cap table, share classes and register of members.
• Record each founder’s expected contribution, role, authority and time commitment.
• Decide whether vesting is appropriate and document the implementation mechanics, not just the schedule.
• Define leaver categories, share prices and decision procedures precisely.
• Align voting, transfer and exit provisions with the articles and company approvals.
• Assign pre-incorporation and founder-created intellectual property where necessary.
• Use separate service or employment agreements where founders work for the company.
• Obtain tax advice on founder shares, valuation, elections and ERS reporting.
• Plan for new founders, investment, dilution and replacement documents.
• Choose StartWise, a static template or bespoke support according to complexity and risk.

Official and related resources

• Companies Act 2006, section 33: effect of the company’s constitution
• Companies Act 2006, Part 18: acquisition by a limited company of its own shares
• GOV.UK: model articles for private companies limited by shares
• GOV.UK: making changes to a private company’s share structure
• Companies House: changes to company registers
• HMRC: how employment-related securities work for employers
• HMRC: founders’ shares and employment-related securities
• HMRC: section 431 restricted-securities elections
• Copyright, Designs and Patents Act 1988, section 11
• Copyright, Designs and Patents Act 1988, sections 90 and 91
• Entrepreneur Legal UK: StartWise Access
• Entrepreneur Legal UK: What Legal Documents Does a UK Startup Need?
• Entrepreneur Legal UK: Business Formation and Business Structure
• Entrepreneur Legal UK: Acquiring Ownership in a Business and Equity Finance
• Entrepreneur Legal UK: Raising Finance
• Entrepreneur Legal UK: Protecting Your Business Name, Logo and IP

Disclaimer

This article provides general information and is not legal or tax advice. It does not determine whether a founders’ agreement, vesting arrangement, share transfer, company buy-back, restrictive covenant or tax election is suitable or effective for a particular company. Obtain appropriate legal and tax advice for complex, negotiated, cross-border, regulated or commercially sensitive arrangements.

StartWise Drafting is not legal advice, lawyer review, legal approval or legal sign-off. Lawyer review, legal consultations and bespoke legal services are separate services and are provided only where expressly agreed. Creating a StartWise account, using StartWise Drafting, purchasing drafting credits or generating a document does not by itself create a lawyer-client relationship.

Entrepreneur Legal UK is the trading name of Entrepreneur Legal Ltd. Entrepreneur Legal Ltd is not regulated by the Solicitors Regulation Authority and does not carry on reserved legal activities.