SEIS and EIS Explained: UK Tax Benefits for Startup Investors

If you're raising money for a UK startup, understanding SEIS and EIS isn't optional—it's essential. These schemes offer significant tax benefits to investors, making your startup more attractive to angels and early-stage funds.

Here's everything founders need to know.

What Are SEIS and EIS?

SEIS (Seed Enterprise Investment Scheme) and EIS (Enterprise Investment Scheme) are UK government programs designed to encourage investment in early-stage companies by offering tax relief to investors.

For investors, these schemes dramatically reduce the risk of startup investment. For founders, they're a powerful incentive that can help close rounds faster.

SEIS: Seed Enterprise Investment Scheme

SEIS is designed for the earliest stage companies.

Tax Benefits for Investors

Example: An investor puts £100,000 into your SEIS-qualifying startup.

• Immediate tax relief: £50,000 (50% of investment)
• Net cost to investor: £50,000
• If the startup fails completely, loss relief further reduces their exposure

SEIS Limits and Requirements

Investment limits:

• Maximum £250,000 lifetime investment per company
• Maximum £200,000 per investor per tax year

Company requirements:

• Less than £350,000 in gross assets before investment
• Fewer than 25 employees
• Less than 3 years old
• Carrying on a qualifying trade
• No previous EIS/VCT investment

Investor requirements:

• Cannot own more than 30% of the company
• Cannot be an employee (directors are ok)
• Must hold shares for minimum 3 years for full relief

EIS: Enterprise Investment Scheme

EIS is for slightly more mature early-stage companies.

Tax Benefits for Investors

The inheritance tax position changed on 6 April 2026. Business property relief on qualifying unquoted shares used to take them out of an estate without limit. It is now capped: full relief applies up to an allowance, and qualifying value above that allowance gets relief at 50% rather than 100%. The allowance figure was revised after it was first announced, so anyone relying on this for estate planning needs current advice rather than a number from an article. Treat IHT as the benefit most likely to have moved since you last looked at it.

Example: An investor puts £500,000 into your EIS-qualifying startup.

• Immediate tax relief: £150,000 (30% of investment)
• Net cost to investor: £350,000
• Plus CGT deferral on other gains, IHT benefits, loss relief if things go wrong

EIS Limits and Requirements

Investment limits (raised from 6 April 2026):

• Maximum £10 million per year per company (£20M for knowledge-intensive companies)
• Maximum £24 million lifetime (£40M for knowledge-intensive companies)
• Maximum £1 million per investor per tax year (£2M where the investment is in knowledge-intensive companies)

These company limits count risk-finance investment across SEIS, EIS and VCT together rather than EIS alone.

Company requirements:

• Fewer than £30 million in gross assets immediately before the share issue, and fewer than £35M immediately after (both raised from 6 April 2026)
• Fewer than 250 employees
• Less than 7 years old (10 for knowledge-intensive companies)
• Carrying on a qualifying trade
• Permanent establishment in the UK

Investor requirements:

• Cannot own more than 30% of the company
• Cannot be an employee (directors are ok)
• Must hold shares for minimum 3 years

SEIS vs EIS: Quick Comparison

Knowledge-intensive companies get the higher EIS limits: £20M a year, £40M lifetime, up to 500 employees, and a 10-year age limit. The EIS company figures above were raised on 6 April 2026, so any guidance written before then understates them substantially.

What Disqualifies a Company?

Both schemes exclude certain activities. Your startup won't qualify if it primarily involves:

• Property development
• Financial services (with exceptions)
• Legal or accountancy services
• Farming
• Hotels, nursing homes
• Coal or steel production
• Shipbuilding
• Energy generation (some exceptions for renewables)

Most tech startups—SaaS, marketplaces, fintech, healthtech—are eligible.

How to Become SEIS/EIS Qualifying

Step 1: Advance Assurance

Before raising, apply to HMRC for "advance assurance." This confirms your company qualifies for the scheme and gives investors confidence.

You'll need:

• Business plan
• Financial projections
• Company structure details
• Description of qualifying trade

Processing time: 4-6 weeks typically, though HMRC aims for 15 working days.

Step 2: Issue Shares and Claim Relief

After investment:

1. Issue shares to investors
2. Submit compliance statement (SEIS1/EIS1) to HMRC
3. HMRC issues compliance certificates (SEIS3/EIS3)
4. Investors use certificates to claim tax relief

Step 3: Maintain Compliance

For the 3-year minimum holding period, ensure:

• The company continues qualifying trade
• You don't repay investors' capital
• Investors don't become employees
• Company structure doesn't breach rules

Tips for Founders

1. Get Advance Assurance Early

Apply before you start fundraising. Having HMRC confirmation makes investor conversations much easier.

2. Structure Your Round Properly

If raising more than £250k, structure as SEIS for the first £250k, then EIS for the rest. This maximizes investor tax benefits.

3. Work with Experienced Advisors

SEIS/EIS has nuances and traps. Use a lawyer and accountant who specialise in startup fundraising to ensure compliance.

4. Document Everything

Keep clear records of:

• Shareholder agreements
• Board minutes
• Use of funds
• Trade activities

This protects you if HMRC queries eligibility later.

5. Communicate with Investors

Ensure investors understand:

• The holding period requirement (3 years minimum)
• Restrictions on their involvement
• Timeline for receiving tax certificates

Common Mistakes to Avoid

1. Raising Before Advance Assurance If you raise without advance assurance and HMRC later determines you don't qualify, investors lose their tax relief. Some may have legal recourse against you.

2. Exceeding Limits Raising more than £250k under SEIS, or more than the EIS annual company limit, breaches the rules. The limits count risk finance across SEIS, EIS and VCT together, so check the combined position rather than each scheme on its own.

3. Connected Persons Investors who are "connected" to the company (e.g., substantial shareholders, employees) may not qualify. Understand the rules.

4. Non-Qualifying Trade If your business model involves excluded activities, you won't qualify. Get professional advice on borderline cases.

5. Post-Investment Changes Changing your business model, structure, or activities after raising can breach compliance and claw back tax relief.

The Bottom Line for Founders

SEIS and EIS are powerful tools for UK startups:

• SEIS offers 50% tax relief, on up to £250k raised by the company in total
• EIS offers 30% tax relief, on up to £10M raised by the company per year
• Combined with loss relief, investors' downside is significantly protected

This makes UK startups more attractive than equivalents in many other countries. Use it.

A note on dates. These rules move at fiscal events, and several of the EIS figures above changed on 6 April 2026. This article was last checked against HMRC guidance on 5 August 2026. Before you rely on any number here, confirm the current position with your accountant, particularly on inheritance tax, where the treatment of business property relief changed in the same window.

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