TL;DR
SEIS usually fits the earliest UK company stage. EIS usually fits larger eligible Rounds after the company has moved beyond SEIS constraints. Founders should not promise either relief until the company, shares, Investor position, and use of funds have been checked.
SEIS vs EIS comparison table
HMRC guidance updated on 6 April 2026 lists the current income tax relief headline rates and Investor annual limits for SEIS and EIS. Source: GOV.UK venture capital scheme Investor relief.
| Issue | SEIS | EIS |
|---|---|---|
| Best Company fit | Very early, smaller UK Companies. | Larger eligible growth Companies. |
| Investor relief headline | Higher income tax relief on a lower annual limit. | Lower income tax relief on a higher annual limit. |
| Company size | HMRC SEIS guidance refers to gross assets not over GBP 350,000 and fewer than 25 full-time equivalent employees. | HMRC EIS guidance refers to fewer than 250 full-time equivalent employees and gross asset limits for the Company and subsidiaries. |
| Sequencing | Normally comes before EIS. | Can follow SEIS if timing and conditions are handled correctly. |
| Founder risk | Eligibility failure can break Investor trust early. | Larger Round sizes make compliance and evidence discipline more visible. |
Also Read: SEIS and EIS guide
Founder checklist
- Check whether the Company still fits SEIS before discussing SEIS with Investors.
- Confirm whether EIS timing depends on previous SEIS share issues.
- Prepare advance assurance materials where appropriate.
- Keep share terms, Investor communications, use of funds, and compliance evidence in the Data Room.
- Ask advisers to review sequencing before mixing SEIS and EIS in the same fundraising plan.
Bottom line
SEIS is not simply "smaller EIS." It is a separate early-stage scheme with its own limits and sequence risk. Founders should use SEIS and EIS to reduce Investor friction after the Company has a credible Round plan and clean evidence.