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startup equity vesting agreement uk

Vesting Agreement for UK Startups

A startup equity vesting agreement UK founders actually use needs to do one thing well: tie equity to commitment over time. Without a vesting schedule in place, a co-founder who leaves after six months can walk away with a significant chunk of your cap table — and that will cause serious problems when you raise investment. This page explains what a UK vesting agreement should cover, what founders typically get wrong, and how Atornee helps you draft one that holds up. UK vesting agreements sit at the intersection of company law, shareholder agreements, and sometimes employment law. There is no single statutory template, which means the drafting matters. Key clauses include the vesting schedule itself (typically four years with a one-year cliff), good leaver and bad leaver provisions, acceleration triggers, and what happens to unvested shares on exit. If your startup has more than two founders, or you are about to raise a pre-seed round, getting this document right now will save you significant legal cost and founder conflict later.

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Why this matters

Most early-stage UK founders shake hands on equity splits and move on. Then someone leaves, loses motivation, or falls out — and there is nothing in writing to claw back unvested shares. Investors will spot a messy cap table immediately and it can kill a funding round. Even if you never raise, a departing co-founder holding 30% of your company with no vesting conditions is a genuine business risk. The problem is not that founders do not know vesting matters — it is that drafting a proper agreement feels expensive and slow when you are trying to build a product. That is the gap Atornee fills.

The Atornee approach

Atornee is not a template library. When you use it to draft a vesting agreement, it asks you the right questions first: how many founders, what cliff period, what counts as a good leaver versus bad leaver in your context, whether you want single or double trigger acceleration. It then produces a draft built around your answers, grounded in standard UK practice. You can review, edit, and export it. If your situation is complex — HMRC EMI options, institutional investor requirements, or cross-border founders — Atornee will tell you when you need a solicitor rather than pretend it can handle everything.

What you get

A vesting agreement draft tailored to your founder setup, including cliff period, vesting schedule length, and share class
Good leaver and bad leaver definitions written for UK company law, not US templates copied without adaptation
Acceleration clause options explained in plain English so you can decide what fits your funding plans
A document you can take to a solicitor for a focused review rather than paying for a full draft from scratch
Plain-language summaries of each clause so every founder understands what they are signing

Before you sign checklist

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1. Agree your equity split and vesting schedule terms with all co-founders before you open the drafting tool — document the conversation
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2. Decide on your cliff period (12 months is standard in the UK) and total vesting duration (typically 36–48 months)
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3. Define what a good leaver and bad leaver means for your specific situation before drafting begins
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4. Check whether your company has an existing shareholders agreement — the vesting agreement needs to be consistent with it
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5. Confirm whether any equity is being granted as EMI options rather than direct shares, as that requires separate HMRC-compliant documentation
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6. Use Atornee to generate your draft, then review each clause against your agreed terms
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7. Have a UK solicitor review the final document if you are about to raise investment or if any founder is also an employee

FAQ

Is a vesting agreement legally enforceable in the UK?

Yes, provided it is properly drafted and signed. UK company law does not mandate vesting, but a well-drafted vesting agreement — or vesting provisions within a shareholders agreement — is contractually binding. The key is that it needs to be consistent with your articles of association and any existing shareholder arrangements. If there is a conflict between documents, disputes become expensive to resolve.

What is a standard vesting schedule for a UK startup?

The most common structure is a four-year vesting schedule with a one-year cliff. This means no shares vest in the first 12 months, then 25% vest at the cliff, with the remainder vesting monthly or quarterly over the following three years. Some early-stage UK startups use a three-year schedule, particularly if founders have already been working together for some time. There is no legal requirement — it is a commercial decision.

Do I need a vesting agreement if I already have a shareholders agreement?

Not necessarily as a separate document. Many UK shareholders agreements include vesting provisions directly. If yours does, you may only need to update that document rather than create a standalone vesting agreement. If your shareholders agreement is silent on vesting, you can either amend it or create a separate deed. Check what your existing documents say before drafting anything new.

What is the difference between good leaver and bad leaver in a UK vesting agreement?

A good leaver is typically someone who leaves for reasons outside their control — illness, redundancy, or mutual agreement. They usually keep some or all of their vested shares and may receive fair value for unvested ones. A bad leaver is someone who resigns without cause, is dismissed for misconduct, or breaches the agreement. Bad leavers typically forfeit unvested shares and may only receive nominal value for vested ones. The exact definitions are negotiable and matter a great deal — vague drafting here causes most vesting disputes.

Can Atornee draft a vesting agreement for EMI option holders?

Atornee can help you understand the structure and draft supporting documentation, but EMI option agreements have specific HMRC requirements and need to be filed with HMRC within 92 days of grant. If you are granting EMI options rather than direct shares, you should use Atornee to get your thinking straight and then have a solicitor or tax adviser handle the formal EMI documentation. Getting EMI wrong has real tax consequences.

How much does it cost to get a vesting agreement drafted by a solicitor in the UK?

A standalone vesting agreement from a UK startup solicitor typically costs between £500 and £2,000 depending on complexity and the firm. If it is part of a broader shareholders agreement, costs can be higher. Atornee lets you produce a solid working draft at a fraction of that cost, which you can then take to a solicitor for a focused review rather than a full drafting engagement. That approach usually cuts legal spend significantly.

Related Atornee Guides

Cheap Contract Solicitor Alternative (UK)

Useful if you want to understand how Atornee fits into a broader contract workflow beyond just vesting agreements.

Cheap Solicitor for NDA (UK)

Relevant when onboarding co-founders or advisers who also need confidentiality agreements alongside equity documentation.

Atornee Use Cases

See how founders and operators use Atornee across different legal document types and business stages.

External References

GOV.UK Business and Self-employed

Official UK guidance on business structures, shares, and company administration relevant to equity arrangements.

UK Legislation

Primary statutory reference for the Companies Act 2006 and other legislation underpinning UK equity and shareholder agreements.

Trust & Verification Policy

Authored By

A

Atornee Editorial Team

UK 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 standard UK startup equity practice, common founder disputes arising from absent or poorly drafted vesting terms, and review of publicly available UK company law guidance. It reflects the document structures and clause conventions used in early-stage UK startup transactions."

References & Sources