EIS and SEIS Investment: The Complete Tax and Investment Guide for 2026

The Enterprise Investment Scheme (EIS) and Seed Enterprise Investment Scheme (SEIS) sit at the high-risk, high-reward end of UK tax-advantaged investing. The government offers unusually generous reliefs — 30% income tax relief on EIS, 50% on SEIS — because the capital is directed towards early-stage, unquoted UK businesses that genuinely need risk capital and would struggle to attract it otherwise.

For investors who understand the risks and have genuine appetite for early-stage business exposure, EIS and SEIS can deliver outstanding after-tax outcomes even on moderate pre-tax returns. This guide explains the full framework.

SEIS: Seed Enterprise Investment Scheme

SEIS targets the earliest-stage companies — very new businesses where the risk is highest and the potential return greatest.

SEIS Company Conditions

To qualify, the company must:

• Have been trading for no more than 3 years at the time of the first SEIS investment;
• Have gross assets of no more than £350,000 before the SEIS investment (changed from £200,000 from April 2023);
• Employ fewer than 25 full-time employees;
• Have raised no more than £250,000 under SEIS (raised from £150,000 from April 2023);
• Be UK-incorporated and carry on a qualifying trade (most trades qualify; excluded sectors include financial services, property development, legal and accountancy services, farming, hotels, and others).

SEIS Tax Reliefs

Income tax relief: 50% of the amount invested, up to a maximum subscription of £200,000 per tax year. Maximum annual income tax saving: £100,000 (50% of £200,000).

CGT reinvestment relief: Any capital gain can be reinvested into SEIS shares, with 50% of the reinvested amount exempt from CGT. This provides a further boost: a £100,000 capital gain reinvested into SEIS generates a £50,000 CGT exemption (plus the 50% income tax relief on the subscription).

IHT Business Property Relief: SEIS shares in a qualifying trading company may qualify for 100% Business Property Relief (BPR) after 2 years, removing them from the estate. Subject to the April 2026 BPR reforms (£2.5m 100% cap).

Loss relief: If the company fails, the loss (net of income tax relief) can be set against income — at the investor's marginal rate. A 45% taxpayer who loses £100,000 on a SEIS investment has an effective net loss of £27,500 after tax (£50,000 income tax relief received upfront; £22,500 loss relief at 45% on the remaining £50,000 loss).

CGT-free disposal: Gains on disposal of qualifying SEIS shares after the minimum holding period (3 years) are exempt from CGT.

EIS: Enterprise Investment Scheme

EIS targets slightly more established businesses — post-revenue, post-seed, often raising growth capital.

EIS Company Conditions

• The company must have been carrying on a qualifying trade for at least 4 months before the EIS investment (or the investment must be used to start such a trade);
• Gross assets no more than £15 million before investment and £16 million after;
• Fewer than 250 full-time employees;
• No more than £5 million raised under EIS and other risk finance schemes per year;
• Qualifying trade (same excluded sectors as SEIS, plus some additional restrictions for EIS on companies that are majority-owned subsidiaries of quoted companies).

Knowledge-Intensive Companies (KICs) — Enhanced EIS

EIS conditions are relaxed for qualifying Knowledge-Intensive Companies (KICs) — broadly, companies where at least 10% of full-time employees are working on research and development, or where a significant proportion of costs are in R&D. For KICs:

• Maximum annual fundraising limit is £10 million (vs £5m for standard EIS);
• The annual income tax relief limit for investors is doubled to £2 million (vs £1m for standard EIS), provided the additional £1m is invested in KICs;
• The employee cap is 500.

Many high-growth technology and life sciences companies qualify as KICs, making this a route for investors who wish to put more than £1m per year into EIS-qualifying investments.

EIS Tax Reliefs

Income tax relief: 30% of the amount invested, on up to £1 million per tax year (or £2m for KICs). Maximum annual income tax saving: £300,000 (on £1m) or £600,000 (on £2m for KICs).

CGT deferral: Any capital gain (from the disposal of any asset) can be deferred by investing an equivalent amount into EIS shares. The gain is deferred until the EIS shares are sold (at which point the deferred gain crystallises, taxed at the CGT rate applicable at that time). This is entirely separate from the income tax relief and can be used for very large gains — there is no cap on the amount that can be deferred.

IHT Business Property Relief: As with SEIS, EIS shares in qualifying companies attract 100% BPR after 2 years. Subject to the April 2026 BPR cap.

Loss relief: Losses (net of income tax relief received) can be set against income at the marginal rate.

CGT-free disposal: Gains on EIS shares held for at least 3 years are exempt from CGT.

Fund vs Direct Investment

EIS and SEIS investments can be made either directly (individual company selection) or through managed funds.

Direct investment: Higher potential return if the investor can identify exceptional individual companies. Also higher risk — a single company that fails destroys the investment (even after loss relief). Requires significant due diligence capability or reliable access to deal flow.

Fund investment: A manager selects a diversified portfolio of EIS-qualifying companies. Returns are blended; the fund structure reduces the risk of complete loss. However, manager fees reduce net returns, and fund-level due diligence quality varies widely.

For investors without specialist venture capital networks, an EIS fund from a reputable manager (Octopus Investments, Mercia, Amadeus Capital, etc.) is generally preferable to direct investment in individual companies without deep knowledge.

Advance Assurance

Before making an EIS or SEIS investment, investors may wish to ensure the company and the investment round genuinely qualify. Companies can apply to HMRC for advance assurance — a pre-approval confirming that the company's current activities and structure would qualify for EIS or SEIS if an investment were made.

Advance assurance:

• Is not legally binding but provides comfort;
• Takes 4-8 weeks (sometimes longer);
• Requires the company to provide detailed information on its activities, corporate structure, and intended use of proceeds;
• Is invalidated by material changes after it is issued.

Investors in unmanaged EIS deals should request sight of the advance assurance letter before committing. For established EIS funds, the manager handles qualifying status.

The Connected Person Restriction

An investor cannot claim EIS or SEIS relief on an investment in a company in which they are a connected person. For EIS, connected includes:

• Being an employee, director, or partner of the company at the time of investment (or within 2 years before);
• Holding more than 30% of the company's shares or voting rights;
• Certain family connections.

This prevents individuals from using EIS to invest in their own business — a common misconception. The relief is designed for external investors taking risk on others' businesses, not for owners investing in their own company.

Exception: Directors who are not remunerated employees can invest in a company in which they are (or become) a director. But the conditions are strict and professional advice should be taken before any director investment.

Key Pitfalls and HMRC Risk Areas

Withdrawal of advance assurance: Advance assurance can be withdrawn if the company changes its activities materially. If HMRC subsequently determines that the company's activities were not qualifying, the investor's relief is clawed back.

Trade test: The "trading" test is applied throughout the EIS holding period, not just at investment. If a company ceases to trade, diversifies into non-qualifying activities, or is acquired by a non-qualifying buyer within the 3-year holding period, relief is clawed back.

Dilution: If the investor's shareholding is diluted below EIS-eligible levels by a subsequent funding round, the relief on the diluted portion may be affected.

Withdrawal of VCT or EIS relief in the same investment: An investment cannot be both an EIS investment and a VCT investment in the same company.

EIS and SEIS investments are high risk. Capital is at risk and you could lose some or all of your investment. Past performance is no guide to future returns. Tax reliefs are subject to qualifying conditions and HMRC rules that may change. This is not investment advice — seek advice from a qualified adviser before investing.

How Global Investments Can Help

EIS and SEIS investing, done properly, requires the integration of investment selection, tax planning, and portfolio monitoring. Global Investments advises on how EIS/SEIS fits within your overall tax planning — particularly for high earners managing their income tax position, business owners reinvesting sale proceeds, or investors with capital gains seeking deferral. We work with reputable EIS and SEIS fund managers and can help identify structures appropriate to your circumstances. Contact us to discuss how EIS and SEIS might form part of your investment strategy.