What is EIS? The Complete Guide to the Enterprise Investment Scheme (2026)

The Enterprise Investment Scheme — EIS — is one of the most generous investment tax programmes the UK government has ever created. Thirty per cent income tax relief. Zero capital gains tax on profits. A mechanism to defer CGT from other disposals. Loss relief that caps your downside. Inheritance tax exemption after two years.

EIS investment UK has been running since 1994. In the 2023/24 tax year, 3,780 companies raised £1.575 billion through the EIS scheme UK. It is not a niche product for specialists. It is a mainstream part of how serious UK investors structure their portfolios.

Is EIS a good investment? That depends entirely on your tax position, risk appetite, and investment horizon. This guide explains exactly how EIS works so you can make that judgement.

What is EIS and how does EIS work?

EIS UK stands for Enterprise Investment Scheme. Administered by HMRC, the EIS scheme provides a package of tax reliefs to individuals who invest in qualifying unlisted UK companies. EIS explained simply: the government uses tax incentives to channel private capital into early-stage British businesses that struggle to access conventional financing.

The logic is straightforward. Early-stage companies are risky. Most fail. Without an incentive, rational investors would put money into listed stocks, property, or cash. EIS tips the balance — not by removing the risk, but by making the risk-reward profile significantly more attractive.

EIS UK sits alongside SEIS (Seed Enterprise Investment Scheme) as the two main tax-advantaged venture investment schemes. SEIS targets the very earliest stage — pre-revenue seed companies. EIS covers a wider range of companies that have progressed beyond seed stage but remain growing, private, and high risk. Many companies raise SEIS first then follow with an EIS round as they mature.

The EIS tax relief package

EIS income tax relief — 30%

EIS 30% tax relief is the headline benefit. Invest £100,000 in a qualifying EIS company and reduce your income tax bill by £30,000. Invest £1 million and save £300,000. The EIS income tax relief is claimed through Self Assessment — applied to the year of investment or carried back to the prior year using EIS carry back. You cannot claim more EIS income tax relief than your total income tax liability for the year.

EIS capital gains tax relief — the exemption

Hold EIS shares for at least three years and any gain is completely free of CGT. EIS capital gains tax relief means that for a higher-rate taxpayer, the 24% CGT that would normally apply on investment gains does not apply to EIS exits. On a successful investment that doubles or triples in value, this is a substantial additional return on top of the 30% EIS tax relief already received.

EIS CGT deferral

EIS CGT deferral is one of the most powerful and least-understood EIS tax benefits. If you have a capital gain from any source — a property sale, a business exit, a portfolio disposal — you can invest that gain into EIS and defer the CGT indefinitely.

The investment must be made within one year before or three years after the gain arises. There is no cap on the size of gain you can defer through EIS CGT deferral. A landlord selling a buy-to-let with a £500,000 gain can defer the entire CGT bill. The deferred gain becomes chargeable when the EIS shares are eventually sold.

EIS loss relief

EIS companies fail. That is the nature of early-stage investing. If an EIS company fails, you claim loss relief on the net loss — the original investment minus the 30% income tax relief already received. For a 45% taxpayer: invest £100,000, receive £30,000 relief upfront. Net loss on failure: £70,000. Loss relief at 45%: £31,500. Total tax recovered: £61,500. Maximum effective loss: £38,500 — or 38.5p in the pound.

EIS inheritance tax relief

Hold EIS shares for two years and they qualify for Business Property Relief at 100%, removing them entirely from your estate for IHT. EIS inheritance tax relief at 100% means that with IHT at 40%, this is a substantial long-term benefit for investors who hold beyond the two-year mark.

These five reliefs together make EIS a tax efficient investment unlike any other mainstream vehicle available in the UK. No other EIS tax efficient investment wrapper combines all five simultaneously. No other investment combines income tax relief, CGT exemption, CGT deferral, loss relief, and IHT relief simultaneously.

EIS qualifying companies — HMRC rules

Not every private company qualifies. EIS HMRC criteria at the time of investment:

• Fewer than 250 employees (500 for knowledge-intensive companies)
• Gross assets under £15 million before the investment
• First commercial sale within the last 7 years (10 for knowledge-intensive companies)
• No more than £12 million raised through EIS lifetime (£20 million for knowledge-intensive companies)
• A qualifying trade — financial services, property development, and energy generation are among the excluded sectors
• UK-based trading company, unlisted

These are the EIS rules on company eligibility. EIS approved companies are those that have received Advance Assurance from HMRC — pre-clearance that the investment will qualify before investors commit. EIS eligible companies that have not obtained Advance Assurance are a higher documentation risk for investors. Most serious EIS investment opportunities come with Advance Assurance in place.

EIS advance assurance is applied for by the company before fundraising. It is not a guarantee — HMRC can still reject relief if conditions are not met at the time of investment — but it is the standard practice across the EIS ecosystem.

How to invest in EIS — the main routes

How to invest in EIS depends on how much involvement you want and how much capital you are deploying. There are three main approaches:

• Direct investment into EIS companies — you invest directly into a specific EIS qualifying company through a platform, a syndicate, or a direct relationship with founders. You pick the company, you do the due diligence, you take the concentrated risk. The best EIS investments at the direct level require genuine research into individual companies. Find EIS companies through platforms like Seedrs and Crowdcube, through syndicates, or through curated deal flow services.
• EIS investment funds — a professional EIS fund manager selects and manages a portfolio of EIS eligible companies on your behalf. EIS investment funds provide diversification across multiple companies, reducing concentration risk. You pay management fees and performance fees. The best EIS funds tend to have specialist sector focus and active portfolio management. Top EIS funds are typically offered by established EIS fund managers with multi-year track records.
• EIS portfolio managers — EIS fund managers who offer curated deal flow and managed EIS portfolios for high net worth investors, with more personalised service than a standard fund structure. EIS portfolio services sit between direct investing and formal fund structures.

When evaluating EIS investment opportunities, the key factors are: the quality of the investment team and their deal selection track record, the sector focus and whether the EIS portfolio has genuine diversification, fee structures across the EIS investment funds, and the manager's approach to exits.

EIS investment limits — 2026

• £1 million per investor per tax year — standard EIS investment UK limit
• £2 million per tax year — where the additional £1 million is in knowledge-intensive companies

The risks

EIS is a tax efficient investment vehicle — but it does not make risky investments safe. EIS qualifying companies are unlisted, illiquid, and most will not deliver positive returns.

• Illiquidity — there is no market for EIS shares. You are in until an exit event. Plan for five to ten years minimum.
• Company failure — even with loss relief, failure is a real financial loss. 38.5p in the pound is still 38.5p.
• Dilution — later funding rounds reduce your stake.
• Clawback — HMRC reclaims EIS income tax relief if qualifying conditions are breached within three years.
• Rule changes — EIS scheme UK rules are set by government and can change. The scheme is extended to 2035.

EIS vs SEIS

SEIS targets seed-stage companies (pre-revenue, under 25 employees, under 3 years old). EIS UK covers a wider range of more established private companies. SEIS offers higher income tax relief (50% vs 30%) but lower limits (£200,000 vs £1 million). Many investors use SEIS and EIS together.