--- title: "SEIS & EIS Advance Assurance: The 50% Tax Relief That Closes Rounds | Hypergility" description: "How UK founders secure SEIS and EIS advance assurance from HMRC, what investors look for, common rejection reasons, and the realistic timeline." lang: en json-ld: | { "@context": "https://schema.org", "@type": "BlogPosting", "headline": "SEIS & EIS Advance Assurance: The 50% Tax Relief That Closes Rounds", "description": "How UK founders secure SEIS and EIS advance assurance from HMRC, what investors look for, common rejection reasons, and the realistic timeline.", "author": [ { "@type": "Person", "name": "Don MacMillan" } ], "datePublished": "2026-04-21T11:00:00+00:00", "dateModified": "2026-05-21T16:28:51.808646+00:00", "image": "https://aaiqevwzojrlzhxdxxzq.supabase.co/storage/v1/object/public/media-processed/blog-heroes/seis-eis-advance-assurance-the-50-percent-relief.jpg", "keywords": "Build & ship", "mainEntityOfPage": { "@type": "WebPage", "@id": "https://www.hypergility.com/blog/seis-eis-advance-assurance-the-50-percent-relief" }, "publisher": { "@type": "Organization", "name": "Hypergility", "url": "https://www.hypergility.com" } } --- [![Hypergility](/assets/hypergility-logo-BKOgRT51.png)for bold startups ](/) Services [Startup Grower](https://startupgrower.hypergility.io/)[Website Build](/build-your-website)[Public Sector Bids](/offerings/win-public-sector-bids)[Management Systems & Assurance](/services/management-systems) Who it's for [Are you a bold founder?](/are-you-a-bold-founder)[Innovation Hubs](/partners/innovation-hubs)[Universities](/partners/universities)[Researchers](/personas/researchers) [Why us](/why-us)[News](/news)[Try Startup Grower](https://startupgrower.hypergility.io/)[Contact](/contact) [Back to News](/news) ![SEIS & EIS Advance Assurance: The 50% Tax Relief That Closes Rounds](https://aaiqevwzojrlzhxdxxzq.supabase.co/storage/v1/object/public/media-processed/blog-heroes/seis-eis-advance-assurance-the-50-percent-relief.jpg) Build & ship # SEIS & EIS Advance Assurance: The 50% Tax Relief That Closes Rounds Don MacMillan April 21, 2026 If you are raising from UK angel investors and your pitch deck does not mention SEIS or EIS advance assurance, you are quietly losing cheques. The 50% income tax relief on SEIS investments — and the loss relief on top — is what makes the unit economics work for individual angels writing £10k–£200k tickets. No advance assurance, no cheque. ## What it is Advance assurance is HMRC confirming, in writing and in advance of investment, that they expect your company to qualify for SEIS or EIS relief. It is not legally binding but in practice every angel and most syndicates treat it as a hard prerequisite. ## Eligibility checklist (the basics) - UK-incorporated company, with a UK permanent establishment. - Fewer than 25 full-time-equivalent employees (SEIS) or 250 (EIS). - Gross assets under £350k before the investment (SEIS) or £15m (EIS). - Trading for fewer than 3 years (SEIS) or 7 years from first commercial sale (EIS). - Carrying out a 'qualifying trade' — most software, hardware and services qualify; finance, legal, property, farming and energy generation do not. ## What the application actually requires - Latest accounts (or a business plan if you have not filed yet). - Articles of Association. - Up-to-date pitch deck or business plan with financial forecasts. - List of proposed investors (HMRC needs at least one named potential investor — can be informal). - Memorandum of any term sheet or proposed investment terms. ## Top 5 reasons applications get rejected **Excluded activity creep.** Even 20% of revenue from a non-qualifying activity (e.g. licensing IP without active development) can disqualify the whole company. **No genuine investor in mind.** HMRC will reject 'we plan to raise from angels eventually' — name someone, even informally. **Risk-to-capital condition failure.** HMRC must be satisfied the investment is for genuine growth and development, not a low-risk capital preservation play. **Connected party shares.** Investors who are existing employees, directors or substantial shareholders (more than 30%) cannot claim SEIS/EIS — flag carefully. **Vague business plan.** If HMRC cannot tell what you actually do or how you will spend the money, they will not assure. ## Realistic timeline HMRC currently takes 4–8 weeks for SEIS/EIS advance assurance, sometimes longer at year end. Apply at least 2 months before you plan to close investment. Once granted, advance assurance does not expire but it is tied to the business plan you submitted — material changes mean re-applying. ## How we help We screen eligibility, prepare the application pack, name a credible investor and handle HMRC correspondence — typically getting assurance through in one cycle, not three. Grower walks you through this — and the rest of the founder journey — week by week, induced with our domain expertise. [Try Grower](https://startupgrower.hypergility.io) ## ASAs and SAFEs — bridging the round before equity closes Sometimes you need to take money in before advance assurance lands or before the priced round is ready. Two instruments do this cleanly, and we run both with our legal partners on either side of the Atlantic. **ASA (Advance Subscription Agreement) — UK.** An ASA is a non-refundable payment for shares to be issued at a future funding round, usually within 6 months. Crucially, an ASA can be SEIS/EIS-compliant if it is non-refundable, has no interest, no discount and converts within the HMRC-mandated 6-month window — meaning angels keep the 50% relief on bridging cheques. **SAFE (Simple Agreement for Future Equity) — USA.** Pioneered by Y Combinator, a SAFE converts to equity at the next priced round, typically with a valuation cap and/or discount. SAFEs are flexible and founder-friendly but are not SEIS/EIS-eligible in the UK — they are the right tool for US investors and Delaware-incorporated companies, not for UK angel cheques. Choosing wrong is expensive: a SAFE issued to a UK angel quietly forfeits their 50% tax relief; an ASA that runs past 6 months loses HMRC qualification and converts as a normal taxable instrument. Our legal partners draft, review and structure both — matched to where the investor sits and what relief they need to keep. > “SEIS and EIS are the most generous startup tax reliefs in the world. 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