Guide · Investment Tax
UK EIS & SEIS Tax Relief Explained 2025/26 — 30%-50% Investor Guide
The Enterprise Investment Scheme (EIS) and its smaller seed-stage sibling, the Seed Enterprise Investment Scheme (SEIS), are the most generous tax-advantaged investment regimes in the UK code. Together they deliver income tax relief at 30% or 50%, full CGT exemption on the eventual exit, deferral of unrelated gains, partial exemption of matched gains, and downside loss relief at the investor's marginal income tax rate — turning a high-risk single-company equity investment into one of the most tax-efficient places a higher-rate UK taxpayer can put capital. This guide walks through every relief, the qualifying rules, two fully worked examples, the EIS3 / SEIS3 paperwork that unlocks the claims, the anti-avoidance rules that catch the unwary, and the related VCT regime for comparison.
- EIS: 30% income tax relief on up to £1m / year (£2m if ≥ £1m in KICs). 3-year hold.
- SEIS: 50% income tax relief on up to £200k / year (raised from £100k April 2023). 3-year hold.
- CGT exit: sell qualifying shares after 3 years → gain is tax-free.
- CGT deferral (EIS): defer any chargeable gain by subscribing within −12 / +36 months.
- SEIS Reinvestment Relief: 50% of a matched gain exempted (up to £100k / year sheltered).
- Loss relief: failure → claim against income at marginal rate. EIS @ 45% → ≈ £45/£100 net risk.
1. EIS — the Enterprise Investment Scheme
EIS was introduced in 1994 and is the senior of the two schemes. It is designed to channel private capital into trading companies that are too young, too risky or too small to raise on the public markets. The headline relief is 30% income tax relief on the amount subscribed for new ordinary shares in a qualifying company, capped at £1 million per tax year. That cap doubles to £2 million per tax year provided at least £1 million of the excess is invested in Knowledge Intensive Companies(KICs) — broadly, R&D-heavy companies satisfying tests on innovation, skilled workforce or qualifying expenditure.
The relief works as a reduction in your income tax bill, not a deduction from income — invest £10,000 and your tax liability falls by £3,000, regardless of marginal rate. Unused relief in a year cannot be carried forward to a future year, but the entire (or part) subscription can be carried back one tax year (subject to that prior year's £1m / £2m cap). To keep the relief, the shares must be held for at least three years from the date of issue, the company must continue to satisfy the EIS conditions throughout that period, and the investor must not become connected with the company in a disqualifying way.
2. SEIS — the Seed Enterprise Investment Scheme
SEIS launched in 2012 to plug the very earliest funding gap — the first £250,000 or so that a brand-new company needs before it can credibly raise EIS rounds. The relief is double the EIS rate: 50% income tax relief on subscriptions of up to £200,000 per tax year. (The annual cap was raised from £100,000 to £200,000 from 6 April 2023, alongside lifts to the company gross-asset and lifetime SEIS-raise limits.) Like EIS, the subscription can be carried back one year.
The trade-off for the higher rate is much stricter company-side conditions. To qualify as a SEIS investee, the company must (at the time of share issue) have gross assets of no more than £350,000, have fewer than 25 full-time-equivalent employees, have been carrying on a qualifying trade for less than 3 years, and have raised no more than £250,000 cumulatively under SEIS. Once any of those ceilings are passed, the company moves to EIS-only fundraising.
3. CGT exemption on exit
If you hold EIS or SEIS shares for the full three-year qualifying period and the company remains qualifying throughout, any gain you make when you eventually sell the shares is completely free of Capital Gains Tax. This is in addition to — not instead of — the upfront income tax relief. The exemption applies only if you actually claimed (and retained) the income tax relief on the subscription; if you didn't claim, or the relief was withdrawn, the gain is taxable in the normal way.
For SEIS in particular, the combination of 50% income tax relief and a tax-free exit is what makes the scheme so attractive: a successful early-stage exit at 5× or 10× the subscription price pays no CGT at all, while the downside has already been halved at the outset.
4. CGT Deferral Relief (EIS only)
If you crystallise a chargeable gain on any other asset — second property, listed shares, business disposal, crypto — you can defer all or part of that gain by reinvesting an equivalent cash amount into qualifying EIS shares. The investment must be made within the window starting 12 months before the gain and ending 36 months after it. The deferred gain comes back into charge when you eventually dispose of the EIS shares (or earlier if the EIS qualifying conditions are breached or you cease UK residence within the period).
Crucially, deferral is uncapped by the £1m annual EIS subscription limit — if you have a £3m gain you can defer the whole gain by subscribing £3m into EIS shares, but income tax relief is still limited to the £1m / £2m annual cap. Deferral also stacks with the 30% income tax relief: the same EIS subscription can secure both reliefs simultaneously.
5. SEIS Reinvestment Relief
SEIS has its own, more generous CGT mechanic. Where EIS only defers the matched gain, SEIS Reinvestment Relief permanently exempts 50% of any chargeable gain that is matched by a SEIS subscription in the same tax year (or carried back). With the £200,000 annual SEIS subscription cap, the maximum gain that can be exempted in a single tax year is therefore £100,000.
The exempted half of the gain is gone forever — it does not come back into charge when the SEIS shares are sold. The other half remains taxable as a normal chargeable gain in the year of the original disposal. The 50% income tax relief on the £200,000 SEIS subscription is, of course, in addition: a saver with a £200,000 gain can receive £100,000 of income tax relief, £50,000 of permanent CGT exemption, and a fully tax-free exit on the SEIS shares if they appreciate.
6. Loss Relief — the downside cushion
EIS and SEIS are higher-risk investments — the rule of thumb is that around 40–60% of single-company seed-stage investments fail. The schemes anticipate this with generous loss relief. If the company fails (or the shares become of negligible value), the allowable loss is the original subscription minus any income tax relief still retained. That loss can be set against:
- Income tax at the investor's marginal rate, in the year of the loss or the previous tax year — a powerful relief unavailable on most other equity losses; or
- Capital gains in the year of the loss or carried forward indefinitely.
For an additional-rate (45%) EIS investor, the math is striking. Invest £100. Receive 30% income tax relief = net cost £70. If the company fails, the allowable loss is £70. Claimed against income at 45% = £31.50 further relief. Total relief = £61.50. Worst-case net loss ≈ £38.50 in every £100 invested— i.e. the Treasury bears roughly £61.50 of every £100 of failed investment. The often-quoted "£45 in every £100" figure for EIS reflects investors at the higher (40%) rate; additional-rate (45%) investors do slightly better. SEIS goes further still: at 45%, the worst-case net loss falls to roughly £27.50 in every £100.
7. Worked Example — SEIS at 45%
Example A — £30,000 SEIS subscription, additional-rate taxpayer
An additional-rate taxpayer subscribes £30,000 for new ordinary shares in a qualifying SEIS company.
Year 0 reliefs: SEIS income tax relief = 50% × £30,000 = £15,000. Net cash cost = £15,000.
Year 3 exit — success scenario: shares double in value, sold for £60,000. Gain = £30,000. CGT exempt → tax-free.
Net return: £60,000 received on £15,000 net invested = 4× net return for a 2× headline return.
Year 3 — failure scenario: shares worthless. Allowable loss = £30,000 − £15,000 retained relief = £15,000. Loss relief at 45% = £6,750. Total relief = £15,000 + £6,750 = £21,750. Net loss = £8,250 in £30,000 invested ≈ 27.5%.
8. Worked Example — EIS with CGT Deferral
Example B — £200,000 EIS subscription deferring a £200,000 gain
An investor sells a buy-to-let in May 2026 crystallising a £200,000 chargeable gain that would otherwise be taxed at 24% residential CGT = £48,000.
In November 2026 the investor subscribes £200,000 for new EIS shares in a qualifying scale-up.
CGT deferral: the entire £200,000 gain is deferred until the EIS shares are sold. £48,000 of CGT pushed into the future.
EIS income tax relief: 30% × £200,000 = £60,000 off the 2026/27 income tax bill.
Net cash cost at year 0: £200,000 − £60,000 (income tax relief) − £48,000 (CGT not yet paid) = £92,000.
Year 3 — success scenario: EIS shares sold for £400,000. The £200,000 deferred gain returns into charge (taxed at the then-current CGT rate). The new £200,000 gain on the EIS shares themselves is fully CGT-exempt.
Year 3 — failure scenario: shares worthless. The deferred gain still crystallises (deferral ends on disposal). Allowable loss on EIS = £200,000 − £60,000 retained = £140,000, available against income at 45% = £63,000 of further tax saved.
9. Qualifying companies and the EIS3 / SEIS3 certificate
For the company to be a qualifying issuer, broadly:
- UK permanent establishment — must have a UK PE throughout the qualifying period.
- Unlisted — shares cannot be listed on a recognised stock exchange (AIM is OK, treated as unlisted).
- Qualifying trade — most trades qualify, but financial services, property dealing, legal/accountancy services, farming, hotels and nursing homes are excluded.
- Size limits (EIS): < 250 full-time employees, gross assets < £15m before / < £16m after the investment, < 7 years since first commercial sale (12 for KICs).
- Size limits (SEIS): < 25 employees, gross assets < £350k, < 3 years trading.
- Funding caps: EIS — £5m / year and £12m lifetime under risk-finance schemes (£10m / £20m for KICs). SEIS — £250k lifetime.
- Shares: new full-risk ordinary shares, paid up in cash on issue, no preferential rights to assets on winding up.
The administrative gateway for the investor is the EIS3 / SEIS3 compliance certificate. The company files form EIS1 / SEIS1 with HMRC's Small Companies Enterprise Centre once it has been trading for 4 months or has spent 70% of the funds raised, HMRC reviews and authorises the company to issue the personalised certificate to each investor, and the investor uses the unique reference number on Self Assessment (or in a stand-alone claim if not within SA). Without an EIS3 / SEIS3, no relief.
10. Anti-avoidance — the traps that withdraw relief
EIS and SEIS are gold-plated reliefs and HMRC has built corresponding gold-plated anti-avoidance rules. The most important investor-side restrictions:
- Connected persons (EIS): the investor (with spouse, parents, children, business partners and certain trusts) must not, at any point in the period from incorporation to 3 years after the share issue, hold more than 30% of the company's ordinary share capital, voting rights, or rights on a winding up.
- Paid directors (EIS): generally disqualified, except under the "business angel" rule — an unpaid director at the time of subscription can later become a paid director without losing relief.
- SEIS director exception: directors (paid or unpaid) can claim, provided the "substantial interest" 30% test is not breached.
- Prior holding: investors who held shares in the company before the relevant EIS / SEIS share issue (other than founder subscriber shares or earlier EIS / SEIS shares) are disqualified.
- Linked loans: if the investor or a connected person makes a loan to the company that would not have been made on the same terms but for the subscription, relief is withdrawn proportionately.
- Value received: any "value" extracted by the investor (loans repaid, assets transferred at undervalue, services paid for) within the 3-year period causes pro rata withdrawal.
- Disposal within 3 years: any sale, gift to a non-spouse, or qualifying-condition breach within 3 years withdraws the income tax relief in full and removes the CGT exemption on the disposal proceeds.
- Pre-arranged exits: if at the time of subscription there is a pre-arranged plan to sell, list or wind up the company, relief is denied.
11. VCT — the listed cousin
Venture Capital Trusts (VCTs) are listed investment companies that pool capital and invest it in a portfolio of EIS-style qualifying trading companies. VCTs were introduced alongside EIS in 1995 and remain a popular alternative for investors who want professional management and tradability rather than direct single-company exposure.
- Income tax relief: 30% on new VCT shares, capped at £200,000 subscribed per tax year.
- Holding period: 5 years (vs 3 for EIS / SEIS).
- Dividends: tax-free on VCT shares — particularly attractive given VCTs often pay 5–7% dividend yields.
- CGT: gains on disposal of VCT shares are CGT-free.
- No CGT deferral, no inheritance tax Business Relief, no loss relief.
- Liquidity: shares are listed (usually on the LSE main market) and can be sold on-exchange, though discounts to NAV are common.
VCTs are typically positioned as the lower-risk, diversified, lower-relief option; EIS and SEIS as the higher-risk, single-company, higher-relief option. Many high-income taxpayers use both — a £200,000 VCT subscription plus EIS / SEIS — to maximise the £60,000 + £60,000 + £100,000 income tax relief stack within the annual caps.
12. SITR — withdrawn April 2023
Social Investment Tax Relief (SITR) was a sister scheme to EIS for investment in social enterprises and community benefit societies, offering 30% income tax relief and CGT deferral. SITR closed to new investment from 6 April 2023. Existing SITR shares already issued before that date retain relief for their qualifying period, but no new SITR subscriptions are possible. Investors with social- enterprise interest now look to charity Gift Aid, community shares (under separate FCA rules) or — if the entity is structured as a normal trading company — EIS / SEIS itself.
13. Where to read the rules
EIS and SEIS legislation lives in Parts 5 and 5A of the Income Tax Act 2007, with the CGT mechanics in Schedule 5B and section 150A–E of the Taxation of Chargeable Gains Act 1992. HMRC's detailed guidance is the Venture Capital Schemes Manual (VCM) — start at gov.uk/hmrc-internal-manuals/venture-capital-schemes-manual(VCM10000 EIS overview, VCM30000 SEIS, VCM50000 VCT, VCM60000 SITR). HMRC's "Use the EIS to raise money for your company" and "Tax relief for investors using venture capital schemes" pages provide the practitioner-level summary, including the advance-assurance application route most companies take before approaching investors.
Bringing it together
For a UK higher-rate or additional-rate taxpayer with capital to deploy, the EIS / SEIS regime sits at the very top of the tax-efficiency league table. The reliefs stack: SEIS at 50% income tax plus 50% CGT reinvestment exemption plus tax-free exit plus loss relief at marginal rate; EIS at 30% income tax plus uncapped CGT deferral plus tax-free exit plus loss relief plus, after two years, 100% IHT Business Relief. The price is real, illiquid, single-company equity risk — and the necessary discipline of holding for the full three (or five for VCT) years through any breach of the qualifying conditions. Used inside a diversified portfolio of 15–30 qualifying companies and within the annual caps, the schemes turn a high-variance asset class into one of the most attractive risk-adjusted positions available to UK taxpayers. Always check the EIS3 / SEIS3 certificate, lodge the claim on Self Assessment and keep paperwork — the relief is only as solid as the documentation.