The Seed Enterprise Investment Scheme (SEIS) is a UK government initiative that encourages investment in early-stage businesses by offering substantial tax reliefs to individual investors. It is designed to help the smallest and newest companies raise equity financing when they are at their most risky stage.
SEIS sits alongside the larger Enterprise Investment Scheme (EIS) and is administered by HMRC.
How SEIS Works
A qualifying company issues new shares to individual investors. In return, the investors receive significant tax reliefs that reduce the effective cost and risk of their investment.
The company must apply to HMRC for advance assurance (optional but recommended) and then issue SEIS3 compliance certificates to investors after shares are issued.
Tax Reliefs for Investors
SEIS offers some of the most generous tax reliefs available to UK investors:
| Relief | Detail |
|---|---|
| Income Tax relief | 50% of the amount invested, up to £200,000 per tax year |
| Capital Gains Tax (CGT) exemption | Gains on SEIS shares held for 3+ years are tax-free |
| CGT reinvestment relief | 50% exemption on gains reinvested into SEIS shares in the same tax year |
| Loss relief | If the investment fails, losses (net of Income Tax relief) can be offset against income or capital gains |
| Inheritance Tax relief | SEIS shares qualify for Business Relief after 2 years (100% IHT exemption) |
Example
An investor puts £100,000 into SEIS-qualifying shares:
- Income Tax relief: £50,000 (50% of £100,000) — effectively halving the cost of the investment
- If the shares become worthless, the investor can claim loss relief on the remaining £50,000
- If the shares are sold after 3 years for a profit, the gain is completely free of Capital Gains Tax
This combination of reliefs means SEIS investors face significantly less downside risk than with unrelieved investments.
Limits and Conditions for Investors
- Maximum investment qualifying for Income Tax relief: £200,000 per tax year
- Shares must be held for a minimum of 3 years to retain all reliefs
- The investor must not be connected to the company (e.g. not an employee, director with more than 30% of shares, or a paid director before the share issue)
- Carry-back is available — you can elect to treat SEIS investment in one tax year as if made in the previous year
Qualifying Company Rules
Not every company can use SEIS. The company must meet strict criteria at the time the shares are issued:
Company Requirements
- UK permanent establishment — Must carry on a qualifying trade through a UK base
- Age limit — Must have been trading for fewer than 3 years
- Gross assets — Must not exceed £350,000 immediately before the share issue
- Employee count — Fewer than 25 full-time equivalent employees
- Lifetime SEIS limit — Can raise a maximum of £250,000 in total through SEIS
- Independence — Must not be controlled by another company or have subsidiaries that are not qualifying
- New shares — Must issue new ordinary shares (not preference shares or existing shares)
Qualifying Trades
Most trades qualify for SEIS, but certain activities are excluded:
- Dealing in land, commodities, or financial instruments
- Leasing or receiving royalties
- Property development
- Legal and financial services
- Farming and market gardening
- Hotels, nursing homes, and residential care
- Energy generation (with some exceptions)
- Shipbuilding and coal/steel production
The trade must be carried on with a view to profit and must not be a hobby or lifestyle activity.
The SEIS Process for Companies
- Check eligibility — Ensure the company and its trade meet all SEIS requirements
- Apply for advance assurance (optional) — Submit form SEIS1 to HMRC before issuing shares to get confirmation that the investment should qualify
- Issue shares — Complete the share allotment and update Companies House records
- Apply for compliance certificates — Submit form SEIS1 to HMRC within the required timeframe
- Issue SEIS3 certificates to investors — Investors use these to claim tax reliefs on their self-assessment returns
The advance assurance process typically takes 4 to 8 weeks and gives both the company and investors confidence before money changes hands.
SEIS and the Company’s Accounts
Funds raised through SEIS appear as share capital and share premium on the company’s balance sheet. Unlike a business loan, there is no debt to repay and no interest charge in the profit and loss account.
However, the founders’ ownership is diluted because new shares are issued. This is a key consideration when deciding between SEIS and debt financing.
SEIS vs EIS
| Feature | SEIS | EIS |
|---|---|---|
| Income Tax relief | 50% | 30% |
| Annual investment limit (investor) | £200,000 | £1 million (£2 million if invested in knowledge-intensive companies) |
| Lifetime fundraising limit (company) | £250,000 | Much higher, set by HMRC (raised from 6 April 2026) |
| Company age limit | Under 3 years | Under 7 years (10 for knowledge-intensive) |
| Gross asset limit | £350,000 | Much higher, set by HMRC (raised from 6 April 2026) |
| Employee limit | Fewer than 25 | Fewer than 250 |
| CGT exemption | Yes (after 3 years) | Yes (after 3 years) |
| Loss relief | Yes | Yes |
Many companies start with SEIS to raise their first £250,000 and then move on to EIS for larger funding rounds.
SEIS vs Other Funding Options
For founders deciding between SEIS investment and other options:
- Angel investment — Angels frequently invest through SEIS because of the tax reliefs, making it easier to attract early-stage funding
- Venture capital — VC funds typically invest larger amounts and usually use EIS rather than SEIS
- Business grants — Grants are free money but often come with conditions and lengthy application processes
- Start Up Loans — Debt-based, no equity dilution, but must be repaid with interest
Common Pitfalls
Companies and investors should be aware of situations that can disqualify SEIS relief:
- Investor connected to the company before the share issue — even a small paid consultancy role can disqualify relief
- Money spent before shares are issued — HMRC may question whether the investment was genuinely at risk
- Breaching the 3-year holding period — Selling shares within 3 years triggers clawback of Income Tax relief and CGT exemption
- Non-qualifying expenditure — If the company does not use the funds for its qualifying trade within the required timeframe
- Receiving value — If the company provides benefits to the investor (beyond normal dividends), relief may be withdrawn
Professional advice from an accountant or tax adviser experienced with SEIS is strongly recommended to avoid these pitfalls.