The Enterprise Investment Scheme (EIS) and Seed Enterprise Investment Scheme (SEIS) are UK government programmes that offer substantial income tax relief and capital gains tax benefits to individuals who invest in qualifying early-stage companies. EIS provides 30% income tax relief on up to £1 million invested per year. SEIS provides 50% income tax relief on up to £200,000 per year in even earlier-stage startups. Both are high-risk investments, but the government-backed tax incentives mean a portion of your downside is covered by tax savings.
Quick answer: EIS: invest up to £1 million in qualifying early-stage UK companies, get 30% income tax relief, CGT-free profits after 3 years, and CGT deferral on other gains reinvested. SEIS: invest up to £200,000, get 50% income tax relief. Both: hold for 3 years minimum. Both are HIGH-RISK — most startups fail. The tax relief cushions the loss, not the risk.
EIS vs SEIS: Side-by-Side 2026
| Feature | EIS | SEIS |
|---|---|---|
| Max annual investment | £1 million (£2M for knowledge-intensive companies) | £200,000 |
| Income tax relief rate | 30% | 50% |
| Max income tax relief per year | £300,000 (£600K for KICs) | £100,000 |
| Minimum holding period | 3 years | 3 years |
| CGT exemption on profits | Yes — after 3 years | Yes — after 3 years |
| CGT reinvestment/deferral relief | Yes — defer existing CGT by reinvesting in EIS | 50% CGT relief on gains reinvested into SEIS |
| Loss relief | Yes — set loss against income or CGT | Yes |
| IHT Business Property Relief | After 2 years holding | After 2 years holding |
| Company size limit | ≤ 250 employees, gross assets ≤ £15M | ≤ 25 employees, gross assets ≤ £350K |
| Company age limit | Trading < 7 years (10 for KICs) | Trading < 3 years |
How EIS Tax Relief Works
1. Income Tax Relief (30%)
If you invest £50,000 into a qualifying EIS company, you receive £15,000 (30%) off your income tax bill — reducing your effective cost to £35,000.
Example:
- EIS investment: £50,000
- Income tax relief (30%): −£15,000
- Net cost of investment: £35,000
Your actual income tax bill for the year must be at least £15,000 to claim the full £15,000 relief. You can carry back up to the full EIS investment to the previous tax year (subject to the annual limit) if you need more capacity.
2. CGT Exemption on Profits
If your EIS shares increase in value and you sell after 3+ years, all profits are exempt from Capital Gains Tax. On a £50,000 investment (after relief) that grows to £100,000 over 5 years, the entire £50,000 profit is tax-free.
3. CGT Deferral Relief
If you have realised a capital gain (on a property sale, share sale, or business disposal), you can reinvest the gain into EIS shares and defer the CGT until the EIS shares are sold. The deferred gain is triggered when the EIS shares are eventually sold (or if qualifying conditions are broken).
Example:
- You sell a rental property, generating a £80,000 capital gain
- You invest £80,000 in EIS shares within 1 year before or 3 years after the gain
- CGT of £80,000 is deferred until the EIS shares are sold or another chargeable event occurs
4. Loss Relief
If the EIS company fails and the shares become worthless:
- Your total loss = original investment − EIS income tax relief = net loss
- This net loss can be set against income tax (rather than just capital gains)
Example:
- £50,000 invested; £15,000 EIS relief received
- Company fails: net loss = £35,000
- Set against income at 45% rate: £35,000 × 45% = £15,750 tax saved
- Total “rescued” from tax reliefs: £15,000 + £15,750 = £30,750 of the £50,000 lost
This means the worst-case effective loss on a higher-rate taxpayer is approximately £19,250 on a £50,000 EIS investment — the government absorbs more than 60%.
How SEIS Works
SEIS operates similarly to EIS but with higher relief rates for higher-risk investments:
50% income tax relief: Invest £20,000 into a qualifying startup, get £10,000 off your income tax bill. Net cost: £10,000.
50% CGT reinvestment relief: If you have a £20,000 capital gain and reinvest it into SEIS, 50% of that reinvested amount (£10,000) is exempt from CGT immediately. This is not a deferral — it is a permanent exemption.
CGT exemption after 3 years: Profits on SEIS shares sold after 3 years are CGT-free.
Qualifying Companies for EIS
For EIS relief, the company must:
- Be carrying on a qualifying trade (most commercial activities qualify; property, financial services, and legal work are excluded)
- Have gross assets below £15 million before and £16 million after the share issue
- Have fewer than 250 full-time employees (500 for knowledge-intensive companies)
- Have been carrying on a qualifying trade for fewer than 7 years (or 10 years for knowledge-intensive)
- Be incorporated in the UK or established in an EEA state
- Not be listed on a recognised stock exchange (AIM qualifies)
Not EIS-qualifying: Property companies, hotels, nursing homes, financial services, energy companies with “guaranteed returns,” forestry, legal firms.
Practical Considerations and Risks
These are high-risk investments. Most early-stage companies fail. The tax reliefs reduce the downside but do not eliminate investment risk. Before investing:
- Only invest amounts you can afford to lose entirely
- Ensure the company has been issued an EIS compliance statement from HMRC (or SEIS compliance certificate)
- Diversify across multiple EIS/SEIS companies, not just one
- Consider EIS funds or platforms (Seedrs, Crowdcube, Syndicate Room) for managed diversification
Exit risk: EIS and SEIS investments are illiquid — there is typically no public market for the shares. Exits usually happen through company sale/acquisition, IPO, or management buyout — all uncertain and often delayed.
VCT: A Less Risky Alternative
Venture Capital Trusts (VCTs) invest in a portfolio of qualifying companies, similar to a fund. VCT reliefs:
- 30% income tax relief on up to £200,000 per year in new VCT shares
- Dividends from VCT are tax-free
- Gains on sale of VCT shares are CGT-exempt
VCTs are listed on the London Stock Exchange, providing more liquidity than direct EIS/SEIS investments. However, VCT shares often trade at a discount to net asset value.
Related UK Investment and Tax Resources
- Capital Gains Tax UK 2026 — CGT rates and exemptions
- Business Property Relief 2026 — BPR and AIM shares for IHT planning
- ISA Guide 2026 — tax-free investing via ISAs
- UK Taxes Hub — all UK tax guides
EIS and SEIS are powerful tools for UK investors who have used their ISA and pension allowances and want additional tax-efficient exposure to UK growth companies. The key is to treat EIS/SEIS as a high-risk allocation with government-subsidised downside — not as a safe investment with a tax benefit.
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