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by Undo Capital
December 11, 2025
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What Is Advance Assurance SEIS/EIS?

SEIS/EIS advance assurance is a non-binding written opinion from HMRC that a proposed share issue should qualify for the Seed Enterprise Investment Scheme (SEIS) or Enterprise Investment Scheme (EIS), giving investors early comfort that tax relief will likely be available.

SEIS/EIS Advance Assurance Meaning

When founders ask “What is SEIS/EIS advance assurance?”, they want clarity that SEIS/EIS tax relief should apply before investors commit funds. In practice, SEIS/EIS advance assurance means that HMRC reviews the company, round structure and documents in advance and raises no obvious issues. While not a guarantee, SEIS/EIS advance assurance stands for reduced perceived risk and smoother fundraising.

To learn more about SEIS/EIS and advance assurance, visit the SEIS/EIS page on Undo Capital.

Disclosure Notice: This communication is issued by Undo Capital Limited (“Undo Capital”) and is provided strictly for informational purposes only. It contains general information and should not be relied upon as accounting, business, financial, investment, legal, tax, or other professional advice. Undo Capital is not regulated by the Financial Conduct Authority (FCA) and does not provide investment, financial, or tax advice. Our services are designed to assist startups and businesses with company formation, legal agreements, and funding-related documentation. Nothing in this communication constitutes, or should be construed as, a recommendation, offer, or solicitation to purchase or sell any security or financial instrument.
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Undo Capital handles everything — SEIS/EIS, investor agreements, share issue, and filings — in one simple, automated platform.

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Disclaimer: Our services are designed to assist startups and businesses with company formation, legal agreements, and funding-related documentation. We do not provide investment advice, financial advice, or tax advice, nor are we regulated by the Financial Conduct Authority (FCA). Participating in startups and early-stage enterprises carries inherent risks, including limited liquidity, absence of dividends, potential loss of investment, and dilution. Any decisions regarding investments should be made independently by the investor as part of a well-diversified portfolio.