Why UK Founders Require a Formal Shareholders' Agreement Before SEIS/EIS Fundraising

Author : AirCounsel Ltd | Published On : 23 Jul 2026

Why UK Founders Require a Formal Shareholders' Agreement Before SEIS/EIS Fundraising Securing early-stage capital is a defining milestone for any scaling UK business. For many investors, the availability of the Enterprise Investment Scheme (EIS) or Self-Enterprise Investment Scheme (SEIS) is a non-negotiable prerequisite to writing a check. These government initiatives offer substantial tax incentives, but HMRC enforces exceptionally strict compliance rules. According to a market analysis by Carta, high-growth UK startups can raise up to £12 million in EIS funding (and up to £250,000 under SEIS) to scale their operations. However, navigating an eis investment requires more than just meeting the basic company age and trading activity requirements. It demands flawless corporate governance. Failing to put a robust, compliant governance structure in place before you accept funds can permanently disqualify your company from these schemes, destroying investor trust and stalling your growth. This guide explains why a professionally drafted shareholders' agreement is your most critical tool for securing EIS tax status while protecting your company's future. Table of Contents Understanding the EIS Investment Landscape How a Shareholders' Agreement Unlocks Advance Assurance Avoiding Preferential Rights and Veto Traps Navigating the Connected Person Rule Founder Agreements vs. Shareholders' Agreements The SEIS/EIS-Friendly Clause Checklist Step-by-Step UK Fundraising Compliance Timeline Common EIS Governance Mistakes to Avoid How AirCounsel Protects Your Fundraising Round Frequently Asked Questions Recommended Understanding the EIS Investment Landscape An eis investment offers private investors up to 30% income tax relief on their investment, alongside capital gains tax exemptions on eventual profits. SEIS offers even more generous terms, providing up to 50% income tax relief to early-stage backers. Before investors hand over their capital, they expect proof that your company is eligible for these tax reliefs. This is accomplished by securing "Advance Assurance" from HM Revenue and Customs (HMRC), which acts as a provisional green light from the tax authority. What many founders do not realize is that HMRC scrutinizes your company's constitutional documents and share structures before granting this status. Governance Term Explanation Impact on EIS Ordinary Shares Standard equity shares with equal voting, dividend, and distribution rights. Mandatory . EIS shares must carry no preferential rights to assets or dividends. Connected Person An individual holding more than 30% of the company's shares or voting power. Disqualified . Connected persons cannot claim EIS income tax relief on their investments. Advance Assurance HMRC’s provisional confirmation that a proposed investment round meets SEIS/EIS criteria. Crucial . Essential for secure fundraising; requires draft legal documents to be submitted. Shareholders' Agreement A private contract regulating the relationship, voting rights, and exit rules among shareholders. Highly Recommended . Protects scheme integrity and prevents future deadlocks. How a Shareholders' Agreement Unlocks Advance Assurance To secure Advance Assurance, you must submit draft copies of your company's constitutional documents to HMRC. This includes your Articles of Association and your proposed shareholders' agreement. These documents prove that the capital you raise will be treated in accordance with strict tax regulations. Avoiding Preferential Rights and Veto Traps To qualify for EIS relief, the shares issued must be ordinary shares that carry no preferential rights. If your investment documents or shareholders' agreement accidentally give your incoming investors a preference on dividends or liquidation proceeds, HMRC will reject your application. Similarly, giving investors veto rights over day-to-day operational matters can sometimes be interpreted by HMRC as creating a separate class of shares with special control rights. A carefully balanced UK Shareholders' Agreement establishes sensible investor protections—such as drag-along and tag-along rights—without adding clauses that negate the "ordinary share" status required by tax law. Navigating the Connected Person Rule HMRC prevents founders and major stakeholders from gaming the system via the "connected person" rule. Under this rule, any individual who controls more than 30% of the company's ordinary share capital, voting rights, or loan capital is treated as a connected person and is disqualified from claiming EIS income tax relief. A formal agreement ensures that your cap table is transparently managed and that conversion events (such as converting Advanced Subscription Agreements or convertible loans) do not accidentally breach this 30% threshold for your active angel investors. Founder Agreements vs. Shareholders' Agreements Many early-stage teams mix up the documents needed to manage internal equity with the documents needed to manage professional investments. It is vital to understand the difference between these agreements and why they serve entirely different purposes. Founder Agreement (Co-Founder Relationship) : This is an internal contract executed during the earliest days of a startup, often before external capital is raised. It mainly sets out how the co-founders will work together, who owns the initial intellectual property, and what happens if one founder leaves the business early. Shareholders' Agreement (Investor-Founder Governance) : This is a formal, legally binding contract signed by all shareholders, including founders, early employees, and incoming angel or institutional investors. It establishes the actual rules for corporate decision-making, board representation, share transfers, and investor protections. While a founder agreement is useful for basic alignment, HMRC and institutional investors require a robust, professional shareholders' agreement to ensure that the business operates under institutional-grade governance standards before any substantial capital is deployed. The SEIS/EIS-Friendly Clause Checklist When preparing your corporate documents for an investment round, you must ensure that your shareholders' agreement includes specific clauses designed to protect your tax relief status: No Dividend Preference : Make sure all dividends on EIS shares are paid on equal terms with ordinary shares. Equal Liquidation Rights : Prevent any "liquidation preferences" that would guarantee EIS investors their money back before ordinary shareholders in a sale or wind-up process. Reasonable Investor Consent Matters : Ensure that investor majority consent is required only for material, high-level corporate changes (like changing the company's business activities or issuing new classes of shares) rather than basic operational decisions. Fair Vesting Provisions : Establish clear bad leaver and good leaver provisions for founders. This reassures incoming investors that key talent is incentivized to remain with the business without violating tax relief requirements. Step-by-Step UK Fundraising Compliance Timeline To ensure your investment round progresses smoothly without hitches from HMRC, follow this straightforward structure: Incorporate and structure your company : Set up your UK limited company and establish your initial cap table using standard ordinary shares. If you need help with this first step, you can secure professional support through our UK Entity and Company Formation service. Draft your governance documents : Instruct qualified solicitors to draft your Custom Articles of Association and your pilot shareholders' agreement, making sure they comply with HMRC's strict EIS guidelines. Submit for Advance Assurance : File your application with HMRC. You must include your business plan, 3-year financial forecasts, and your draft governance agreements. Negotiate terms with investors : Once you obtain Advance Assurance, issue your term sheets and fine-tune your agreements to reflect your final investor group. Execute and issue shares : Sign your final agreements, collect the investment funds, and issue the ordinary shares. Submit Form EIS1 : After trading for at least 4 months (or spending 70% of the investment amount), submit Form EIS1 to HMRC to secure the actual tax certificates (EIS3) for your investors. Common EIS Governance Mistakes to Avoid In our practice, we frequently see founders make simple, avoidable mistakes that jeopardize their entire funding round: Using generic templates : Standard internet templates often contain hidden "liquidation preference" language or investor vetoes that violate HMRC's definition of ordinary shares. Delayed drafting : Waiting until after funds have cleared to write your governance documents creates immense legal friction, as investors often disagree on post-closing terms. Uncontrolled share classes : Creating multiple, complex share classes (such as Class A, Class B, and Class C shares with different economic rights) often creates preferential terms that disqualify the entire scheme. How AirCounsel Protects Your Fundraising Round Raising capital is stressful enough without worrying about whether a poorly worded clause will ruin your investors' tax benefits. At AirCounsel, we eliminate the guesswork by providing bespoke, solicitor-drafted agreements designed specifically for investment readiness. We do not use generic, automated templates. Our SRA-regulated UK solicitors will construct a tailored Custom Shareholders' Agreement that protects your company's decision-making structure, aligns with your cap table, and fully respects HMRC's guidelines. We offer transparent, flat-rate pricing starting at £750, delivered in just 3 business days. Are you preparing to submit your Advance Assurance application or close your seed round? We also offer on-demand contract assessments through our Review of a Contract or Legal Document service starting at £195. Let our experts verify your existing corporate paperwork before you submit it to HMRC. This article provides general information and is not legal advice. Frequently Asked Questions Can a UK founder claim EIS or SEIS tax relief on their own investment in their company? No. Under HMRC's "connected person" rule, any individual who is a director or employee and owns more than 30% of the company's share capital, voting power, or loan capital is disqualified from claiming income tax relief under these schemes. What share class must be issued for a company to qualify for EIS/SEIS tax relief? You must issue fully paid-up ordinary shares. These shares cannot carry any preferential rights to the company’s assets or dividends upon winding up, and they cannot be redeemable at the option of the investor. Is a shareholders' agreement legally required under UK law before raising EIS investment? While not strictly required by statutory company law, it is a practical necessity. Institutional investors and sophisticated angels will refuse to invest without one, and HMRC requires draft copies of your governance rules before granting Advance Assurance to ensure that the share structural requirements are met. What documents does HMRC require for SEIS/EIS Advance Assurance? HMRC typically requires your company's business plan, a 3-year financial forecast, your current or proposed Articles of Association, your draft shareholders' agreement, details of who is investing, and a signed director's statement. Recommended Why UK Startups Need a Shareholder Agreement Before Raising Capital Mastering Your First Seed Round: A Guide for UK Founders How to Avoid Costly Legal Mistakes in Early Company Formations

Originally published at https://aircounsel.com/uk/blog/shareholders-agreement-seis-eis-fundraising