The main difference between SEIS and EIS is company maturity and tax relief: the Seed Enterprise Investment Scheme (SEIS) offers 50% upfront income tax relief on investments up to £200,000 per tax year in brand-new startups, while the Enterprise Investment Scheme (EIS) offers 30% income tax relief on investments up to £1,000,000 (or £2,000,000 for knowledge-intensive companies) in larger, scaling businesses. Both schemes offer 100% Capital Gains Tax exemption on qualifying profits after three years and substantial loss relief if a venture fails.
SEIS vs EIS: At a Glance
Investing in UK early-stage businesses is exciting, but let us be honest: startup investing carries real risk. To tempt private capital into British ideas, HMRC runs two of the most aggressive tax relief systems on the planet: SEIS and EIS. When deciding between SEIS vs EIS, your choice comes down to how much you want to invest, the maturity of the firm you back, and the size of your tax liability. If you want direct access to vetted UK opportunities across both schemes without paying broker fees, explore Tax saving investments on the Oriel IPO marketplace.
Understanding these schemes gives angel investors, high-net-worth individuals, and founders a clear roadmap. SEIS protects your cash when backing very early seed ventures by wiping out half your initial cheque through income tax relief. EIS lets you deploy serious capital into businesses that already have revenue, traction, and larger teams. Master both, and you can build a resilient, tax-optimised startup portfolio.
What is the Core Difference Between SEIS and EIS?
Both schemes encourage equity investments in unquoted trading companies, but they sit at opposite ends of the startup funding journey. SEIS is built for pre-seed and seed companies that are still validating ideas. EIS is built for scaling businesses that need growth funding to expand operations, hire staff, and launch new products.
Here is how their company and investor rules stack up side by side:
- Upfront Income Tax Relief: SEIS gives you 50% relief; EIS gives you 30% relief.
- Maximum Annual Investor Allowance: SEIS caps out at £200,000 per tax year; EIS allows up to £1,000,000 (or £2,000,000 if investing in knowledge-intensive businesses).
- Company Lifetime Funding Cap: An SEIS business can only raise up to £250,000 across its life; an EIS business can raise up to £12,000,000 (or £20,000,000 for knowledge-intensive firms).
- Company Gross Asset Limits: An SEIS company must have gross assets under £350,000 before investment; an EIS company can hold up to £15,000,000 before the funding round.
- Employee Limits: SEIS targets lean startups with fewer than 25 full-time employees; EIS permits up to 250 employees (500 for knowledge-intensive businesses).
- Maximum Trading Age: SEIS demands the company has traded for less than 3 years; EIS allows trading up to 7 years (10 years for knowledge-intensive firms).
- Minimum Holding Period: Both schemes require you to hold shares for at least 3 years to retain your upfront income tax relief and secure zero Capital Gains Tax.
To dive deep into the very earliest funding stages, check out our guide on SEIS startup investment rules.
How Do SEIS and EIS Tax Benefits Compare?
The tax incentives under both schemes work together to reduce your downside risk while leaving your upside completely unburdened by HMRC. Let us unpack each core benefit.
Upfront Income Tax Relief
Income tax relief gives you an immediate discount on your personal income tax bill for the relevant tax year. You must have an income tax liability to offset, but you can be an employee, business owner, or partner.
Under SEIS, you can invest up to £200,000 every tax year and claim 50% back. Put £50,000 into an SEIS-eligible startup, and your tax bill shrinks by £25,000. Put the full £200,000 in, and you save £100,000 in income tax.
Under EIS, you can invest up to £1,000,000 annually at a 30% relief rate. Allocate £100,000 into an EIS round, and you take £30,000 off your income tax bill. If you back knowledge-intensive companies (like deep tech or biotech), you can invest an extra £1,000,000, taking your potential annual EIS tax deduction to £600,000.
Both schemes also include a handy carry-back rule. If you make an investment in the current tax year, you can treat all or part of that investment as if you made it in the preceding tax year, assuming you have unused allowance remaining for that earlier year. This is a brilliant planning mechanism for anyone facing an unexpected tax bill from bonuses, share vestings, or consultancy income.
Capital Gains Tax (CGT) Exemption on Profits
When a startup succeeds, the upside can be massive. Normally, HMRC takes up to 20% (or more depending on asset class) of your realised profits via Capital Gains Tax.
With both SEIS and EIS, any capital growth you achieve is 100% tax-free, provided you claimed income tax relief on those shares and held them for at least three continuous years. There is no cap on this relief. If you invest £15,000 in an SEIS company and sell your shares five years later for £150,000, that £135,000 profit is yours. No CGT. Not a penny.
Capital Gains Tax Reinvestment vs Deferral Relief
What happens if you have already triggered a hefty capital gain from selling commercial property, public equities, or a private business? This is where the mechanisms between SEIS and EIS diverge.
Under SEIS, you receive CGT Reinvestment Relief. If you realise a capital gain from any taxable asset and reinvest that gain into SEIS-qualifying shares during the same tax year, you can wipe out 50% of the reinvested gain completely. It is not delayed, it is permanently cancelled.
Under EIS, you receive CGT Deferral Relief. If you make a capital gain on another asset, you can defer that gain by investing the proceeds into EIS shares. You can make this investment within 12 months before or up to 36 months after the date you realised your gain. The gain is suspended until you eventually sell the EIS shares or dispose of them. Even better, if you hold those EIS shares until death, the deferred gain disappears entirely.
Loss Relief: What Happens If the Startup Fails?
Early-stage ventures fail. That is reality. But the UK tax code drastically limits your net downside by allowing you to claim loss relief against your marginal income tax rate or against your capital gains.
Your net loss is calculated as your initial cash investment minus any upfront income tax relief you already kept.
Let us run the maths on a £10,000 investment for an additional rate (45%) taxpayer:
The SEIS Scenario:
1. Initial investment: £10,000.
2. Upfront SEIS income tax relief (50%): £5,000.
3. Net cash at risk: £5,000.
4. Company collapses and value drops to zero.
5. You claim loss relief on the £5,000 net loss at 45%: saving £2,250.
6. Total tax saved: £5,000 + £2,250 = £7,250.
7. Your total out-of-pocket loss on a £10,000 failure: £2,750 (just 27.5%).
The EIS Scenario:
1. Initial investment: £10,000.
2. Upfront EIS income tax relief (30%): £3,000.
3. Net cash at risk: £7,000.
4. Company collapses.
5. You claim loss relief on the £7,000 net loss at 45%: saving £3,150.
6. Total tax saved: £3,000 + £3,150 = £6,150.
7. Your total out-of-pocket loss on a £10,000 failure: £3,850 (38.5%).
Notice that difference? SEIS protects you so effectively that almost three-quarters of your capital is backstopped by the Treasury if the venture fails completely.
Inheritance Tax (IHT) Exemption via Business Relief
Inheritance Tax sits at a punishing 40% on estates above the nil-rate bands. Both SEIS and EIS shares qualify for Business Relief (BR).
Once you have held your unquoted shares for two years, they fall completely outside your taxable estate for Inheritance Tax purposes. If you pass away while holding these shares, your beneficiaries can inherit them without facing the standard 40% IHT hit. For estate planners and high-net-worth families, this makes unquoted enterprise shares an effective vehicle for wealth preservation.
When Should You Choose SEIS Over EIS?
Neither scheme is universally better; they serve distinct functions in your investment strategy.
Choose SEIS if:
* You want rock-bottom downside risk: With 50% income tax relief and generous loss relief, your absolute downside is capped at 27.5% for top-bracket taxpayers.
* You want to cancel out an existing capital gain: SEIS reinvestment relief permanently eliminates half of an existing CGT liability rather than simply deferring it.
* You write smaller ticket sizes: Because SEIS raises are capped at £250,000, founders usually look for cheques between £2,000 and £25,000.
* You want maximum early upside: Backing a company at the idea or prototype stage offers the highest potential multiple on your initial equity.
When Should You Choose EIS Over SEIS?
Choose EIS if:
* You want to deploy significant capital: If you have £100,000, £500,000, or £1,000,000 to invest, SEIS caps out too fast. EIS gives you room to move.
* You prefer proven market traction: EIS businesses have been operating longer, have paying customers, and have usually de-risked their core technology.
* You want to defer large capital gains: If you recently sold a buy-to-let portfolio or exited a private company and face a £200,000 CGT bill, you can defer that bill indefinitely into EIS rounds.
* You want co-investment alongside venture funds: EIS rounds are often syndicated alongside angel syndicates and venture capital firms.
To look at growth-stage rounds that have already proven market viability, explore current EIS startup investment campaigns.
How Do Startups Qualify for SEIS and EIS?
To ensure investors get their tax certificates, the company issuing shares must follow strict criteria defined by HMRC. If the company breaks these rules, HMRC can claw back all investor reliefs.
Essential Company Eligibility Criteria
- Permanent UK Establishment: The company must have a registered office, physical presence, or significant operational base within the UK.
- Qualifying Trade: Most commercial activities qualify, but HMRC excludes property development, banking, financial services, insurance, legal services, accountancy, leasing, forestry, hotels, and energy generation.
- Independence Rule: The business cannot be controlled by another corporate entity, nor can it own non-qualifying subsidiaries.
- Risk to Capital Requirement: The company must demonstrate genuine commercial risk. If there are pre-arranged repurchase terms, guaranteed exit dividends, or debt-like equity safeguards, HMRC will reject the application instantly.
- Use of Proceeds: Every pound raised under either scheme must be spent directly on qualifying trade development within two or three years of the share issue date.
Smart founders protect their investors by securing Advance Assurance from HMRC before taking money. Advance Assurance is HMRC’s provisional confirmation that a business meets the criteria. It gives prospective backers peace of mind before transferring funds.
If you are a founder preparing to raise early-stage equity, learn how to present your business on the Oriel IPO marketplace with our tools for Startup funding for entrepreneurs.
Investor Disqualifications: Rules to Never Break
Even if the company qualifies perfectly, you as an individual investor can accidentally void your reliefs if you trip over these personal restrictions:
- The 30% Connection Rule: You, together with your associates (spouses, civil partners, parents, and children), cannot hold more than 30% of the company’s issued share capital, voting rights, or loan capital.
- Employment Constraints: Under EIS, you cannot be an employee of the company prior to investing. However, you are permitted to become an unpaid director, or a paid director after investing (under the business angel rule). Under SEIS, directors can invest freely, but ordinary employees cannot claim SEIS relief.
- Pre-arranged Exits: Any agreement guaranteeing that your shares will be bought back or liquidated voids your claim.
- The 3-Year Holding Rule: If you dispose of your shares, gift them, or receive non-commercial value back from the business within three years of investment, HMRC will claw back your upfront income tax relief.
How to Claim Your SEIS and EIS Tax Relief: Step-by-Step
Claiming your relief is not instant, but the process is straightforward once you know the timeline.
- Transfer Funds: You subscribe for new ordinary shares and transfer funds directly to the business.
- Trading Milestone: Before the startup can issue tax certificates, it must trade for at least four months or spend at least 80% of the funds raised under that round.
- HMRC Compliance Submission: The founder submits a formal compliance statement (an SEIS1 or EIS1 form) to HMRC.
- Certificates Issued: HMRC reviews the statement and issues the company a batch of unique certificates (SEIS3 or EIS3 forms).
- Investor Receives Certificate: The company sends you your individual form containing an official HMRC reference code.
- Submit Your Claim: You enter the unique investment details into the Additional Information section of your annual Self-Assessment tax return. Alternatively, you can write directly to HMRC to alter your PAYE tax code for the current year, giving you instant monthly tax relief in your salary.
Always retain your SEIS3 and EIS3 certificates. You will need them if you are audited, and you will need to produce them when you sell your shares capital-gains-free years down the line.
How Financial Advisers and Accountants Use These Schemes
Wealth managers and chartered accountants frequently integrate SEIS and EIS into holistic client strategies. These schemes are not just speculative startup punts; they are structural wealth-planning instruments.
Advisers commonly recommend them to:
* Flatten higher-rate and additional-rate income tax bills during exceptional bonus or profit years.
* Shelter proceeds from business sales by deferring or wiping out Capital Gains Tax.
* Remove liquid wealth from 40% Inheritance Tax exposure using the two-year Business Relief window.
If you work in professional practice and need clean, compliant resources to guide your clients, explore our dedicated SEIS EIS support for accountants.
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Frequently Asked Questions About SEIS and EIS
Can a company raise under both SEIS and EIS?
Yes, but order matters. A company must complete its SEIS round before it issues shares under EIS. If a company raises EIS funds first, it permanently loses the right to raise under SEIS. Many early-stage rounds are structured with an initial SEIS tranche followed by an EIS tranche.
What happens if I sell my shares before three years?
If you sell or transfer your shares within the three-year holding window, HMRC will claw back your upfront income tax relief. Furthermore, any gain you make on the sale will be subject to standard Capital Gains Tax rates rather than being tax-free.
Can I invest in SEIS or EIS through an ISA or SIPP?
No. You cannot hold direct SEIS or EIS shares inside an Individual Savings Account (ISA) or a standard Self-Invested Personal Pension (SIPP). You must hold the shares directly in your own name as an individual to claim personal income tax relief and capital gains benefits.
Can overseas residents invest in SEIS and EIS?
Yes, non-UK residents can technically invest in qualifying UK companies. However, to benefit from the income tax relief and CGT reinvestment exemptions, you must have an active UK tax liability against which to offset the reliefs.
What is a Knowledge-Intensive Company (KIC)?
A Knowledge-Intensive Company is an EIS-qualifying business that spends significant operational expenditure on research and development (R&D) or innovation, and meets specific intellectual property or skilled workforce criteria. KICs benefit from higher fundraising limits (£20 million lifetime vs £12 million standard) and can be up to 10 years old.
Ready to put your capital to work with world-class tax incentives? Review vetted, high-potential UK startups by browsing the latest Startup investment opportunities and begin building your tax-efficient portfolio today.
