The UK Startup Founder's Legal Checklist for Raising Capital Under SEIS and EIS Rules in 2026

Author : AirCounsel Ltd | Published On : 09 Jul 2026

The UK Startup Founder's Legal Checklist for Raising Capital Under SEIS and EIS Rules in 2026 Raising early-stage capital in the UK is highly competitive, but the government's tax incentive programs provide a powerful tool to attract investors. For founders looking to close funding rounds quickly, offering tax-efficient investment structures is often the deciding factor for angel investors and venture capitalists. According to official data, in the recent tax year 4,410 companies raised a total of £1,659 million of funds under the EIS scheme , highlighting just how critical these tax reliefs are for the UK startup ecosystem. Historically, the Enterprise Investment Scheme (EIS) and Seed Enterprise Investment Scheme (SEIS) have structured the majority of early-stage deals in London and across the UK. Navigating the compliance requirements of the eis scheme and SEIS rules is essential. A single structural error during your funding round can permanently disqualify your company, leaving your investors with unexpected tax bills and damaging your startup's reputation. This guide outlines the key legal requirements, step-by-step compliance processes, and common pitfalls to avoid when raising capital. Table of Contents Understanding SEIS vs the EIS Scheme Step-by-Step Guide to Applying for HMRC Advance Assurance Critical Share Issuance Requirements Disqualifying Trades and Structural Traps Special Rules for Knowledge-Intensive Companies Legal Due Diligence Checklist for Founders Protect Your Round with AirCounsel Frequently Asked Questions Recommended Quick Summary Takeaway Explanation Tax Incentives SEIS offers up to 50% income tax relief; the EIS scheme offers 30% relief to qualifying individual investors. Advance Assurance A critical, non-mandatory but highly recommended pre-clearance from HMRC that proves your company qualifies. Share Rules You must issue new, ordinary, fully paid-in-cash shares with no preferential rights to assets or dividends. Holding Period Investors must hold their shares for at least 3 years to retain their income tax and capital gains reliefs. Company Age Limits Companies must generally raise under SEIS within 3 years of trading, and under EIS within 7 years of their first commercial sale. Understanding SEIS vs the EIS Scheme Before pitching to investors, founders must understand where their startup fits. SEIS is targeted at very early-stage, seed-level startups, while the eis scheme is designed for larger, growth-stage businesses. Under the rules, a company can raise a lifetime limit of £250,000 under SEIS. Once this cap is reached or exceeded, the company transitions to raising funds under the main eis scheme, which has a much larger lifetime limit of £12 million (or £20 million for specialized knowledge-intensive companies). The primary parameters for eligibility under both programs include: Gross Assets : Your company's gross assets must not exceed £350,000 immediately before an SEIS share issue, and must not exceed £15 million immediately before an EIS share issue. Employee Counts : Your business must have fewer than 25 full-time equivalent employees for SEIS, and fewer than 250 for the standard eis scheme. Trading Age : For SEIS, your company must have been trading for less than 3 years. For EIS, the limit is generally within 7 years of your first commercial sale, though exceptions apply if you are launching a completely new geographic or product market. Step-by-Step Guide to Applying for HMRC Advance Assurance Advance Assurance is an official correspondence from HM Revenue & Customs (HMRC) indicating that your startup meets the requirements of the chosen tax scheme. While not a strict legal requirement to source investment, wild majority of professional angel investors will refuse to wire funds without seeing your Advance Assurance certificate. To apply for Advance Assurance, founders should follow these steps: Prepare Corporate Documents : You will need your company's latest balance sheets, business plan, financial forecasts, and a copy of your Custom Articles of Association . Draft the Investment Pitch : HMRC requires a copy of your pitch deck or investor presentation detailing how the capital will be used to grow and develop your trade. Identify Prospective Investors : You must provide the names, addresses, and proposed investment amounts for at least one or two prospective investors to prove the raise is active. Submit via the HMRC Portal : Fill out the online application and upload your supporting evidence. Receive the Statement of Authority : HMRC typically processes applications in 3 to 6 weeks, issuing a letter confirming your qualifying status. Critical Share Issuance Requirements Securing Advance Assurance is only half the battle. When it comes to actually receiving funds and issuing shares, strict statutory rules apply. If your corporate documentation is structured incorrectly, HMRC can retrospectively withdraw your tax-compliant status. To qualify for tax relief under the eis scheme and SEIS: Ordinary Shares Only : The shares issued must be non-redeemable, plain ordinary shares. No Preferential Rights : The shares cannot carry any preferential rights to the company’s assets upon winding up, nor can they feature preferential dividend rights that act as guaranteed interest. Fully Paid in Cash : Investors must pay for their shares entirely in cash upfront. You cannot issue qualifying tax-relief shares in exchange for services, sweat equity, or write-offs of pre-existing non-qualifying debt. Independence : The investor must not be "connected" to the company. This generally means they cannot hold more than 30% of the company's ordinary share capital, voting rights, or debt. Under the eis scheme, investors also cannot be employees or directors, although there is a "business angel" exception for directors under specific circumstances. Disqualifying Trades and Structural Traps Not every business can utilize these tax schemes. HMRC maintains a list of "excluded activities." If your company's primary trade consists of more than 20% of these excluded activities, you will be disqualified. Common excluded activities include: Dealing in land, property development, or commodity trading. Financial activities like banking, insurance, or money lending. Leasing or hiring out assets. Legal, accounting, or professional service firms. Running hotels, nursing homes, or generating electricity/power. Additionally, pay close attention to your corporate structure. If your startup operates through subsidiaries, the parent company must own at least 50% (and in some cases more than 75% depending on the subsidiary's purpose) of the voting capital of each subsidiary for the group to remain compliant. Special Rules for Knowledge-Intensive Companies If your startup is highly technical, conducts heavy research and development (R&D), or employs structured scientific staff, you may qualify as a Knowledge-Intensive Company (KIC). Qualifying as a KIC significantly relaxes the standard guidelines for the eis scheme: Larger Employee Cap : The maximum employee limit increases from 250 to 500 full-time equivalent employees. Extended Age Limit : The company can raise its first qualifying investment within 10 years of its first commercial sale (or 10 years from reaching a certain turnover threshold), compared to the standard 7-year limit. Increased Funding Caps : KICs can raise up to £10 million per year, compared to the standard annual EIS limit of £5 million. The lifetime fundraising limit also increases to £20 million. To qualify, your company must meet strict R&D cost thresholds (typically spending at least 15% of its operating costs on research in at least one of the three preceding years) and either be creating intellectual property or have a highly qualified workforce where at least 20% of employees hold relevant postgraduate degrees. Legal Due Diligence Checklist for Founders Before executing a funding round, work through this legal checklist to ensure you protect your seed and growth-stage capital: Check that your company's gross assets fit well under the £15 million limit. Confirm that your trade does not fall into any HMRC excluded activities categories. Draft or update your Custom Shareholders Agreement to align with SEIS/EIS voting and transfer restrictions. Secure HMRC Advance Assurance before signing binding investment agreements. Ensure your share issuance resolutions authorize the creation of the exact class of ordinary shares required. Receive all investor funds in cash to your corporate bank account before issuing shares. Issue the mandatory EIS-3 or SEIS-3 compliance forms to investors within the legislative timelines. Protect Your Round with AirCounsel Structuring a funding round requires precision. Errors in your articles of association, investment agreements, or sharing structures can derail your funding and alienate your early investors. At AirCounsel, we help entrepreneurs navigate corporate and investment structures with flat, predictable pricing. Instead of worrying about ticking clocks and unexpected hourly bills, you can work with our SRA-regulated UK solicitors to draft the secure governance documents your investors expect. If you are preparing to raise capital, let our experienced legal team draft your company's foundational documents. Learn more about our Custom Shareholders Agreement or get tailored governance guidance with our Custom Articles of Association . For any quick structural queries or urgent funding compliance questions, you can also Ask a UK Solicitor a Question to get direct, professional answers within hours. This article provides general information and is not legal advice. Frequently Asked Questions What are the main eligibility rules for the eis scheme? To qualify for the eis scheme, your business must have fewer than 250 full-time employees, gross assets under £15 million before share issuance, and be within 7 years of its first commercial sale. Your business must also carry out a qualifying trade and not be listed on a recognized stock exchange. How do I apply for HMRC Advance Assurance? You can apply online via the official HMRC portal. You must supply your business plan, financial forecasts, company articles, a copy of your pitch deck, and the names of prospective investors who have shown interest in your funding round. What share types qualify for EIS and SEIS tax relief? Only newly issued, ordinary shares that are fully paid in cash qualify. The shares cannot have any preferential rights to the assets of the company if it winds up, nor can they have preferential dividend rights that protect the investor from risk. Can a company raise more than £10 million annually under EIS if it is a Knowledge-Intensive Company? Yes. Standard companies are restricted to raising a maximum of £5 million per year under the eis scheme. However, qualifying Knowledge-Intensive Companies (KICs) have an increased annual investment limit of up to £10 million, with an overall lifetime limit of £20 million. Recommended Expert UK Trade Mark Filing Services How to Set Up a Custom Services Agreement in the UK A Founder's Guide to Company Formation and Legal Setup

Originally published at https://aircounsel.com/uk/blog/seis-eis-uk-startup-funding-guide