VC & PE Glossary
What Is SEIS?
Updated
Definition
SEIS — the Seed Enterprise Investment Scheme — is a UK tax incentive encouraging investment in very early-stage companies through income tax relief and other benefits for qualifying investors.
Useful for: Founders, Investors
SEIS (Seed Enterprise Investment Scheme) is a UK government program that makes early startup investing more tax-efficient for qualifying individual investors.
How it works
Eligible investors receive income tax relief on investments into SEIS-qualifying companies, with additional potential benefits on gains and losses subject to current HMRC rules. Companies must meet criteria on age, gross assets, employee count, and trading activity — and cannot be listed or in excluded sectors.
Founders often seek advance assurance from HMRC before marketing a round so angels know the raise will qualify. SEIS sits alongside EIS (Enterprise Investment Scheme) for slightly later or larger raises; combined limits apply per company lifetime.
Investment must be in new shares, not secondaries from founders. Structuring and timing mistakes can disqualify the round.
Why it matters
- Founders: SEIS can unlock UK angel capital that would otherwise wait for lower-risk stages. Plan the round with accountants familiar with advance assurance timelines.
- Investors: Tax relief improves risk-adjusted returns but does not fix weak companies — diligence still drives outcomes.
Common mistake
Assuming all UK startup equity automatically qualifies — trading status, prior funding, and subsidiary structures frequently block SEIS.
Related ideas
- EIS (Enterprise Investment Scheme)
- UK angel and syndicate investing
- Advance assurance and HMRC compliance
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Common questions
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