SEIS Eligibility: The Complete Guide to Qualifying for the Seed Enterprise Investment Scheme

The Seed Enterprise Investment Scheme gives investors 50% income tax relief on investments into early-stage UK companies. But that relief only applies if the company meets every SEIS eligibility condition. Get one wrong, and your investors lose their tax relief entirely.

This guide covers every qualifying condition, the common mistakes that catch founders out, and how to confirm your eligibility before you start fundraising.

Company Qualifying Conditions

SEIS is designed for the earliest-stage companies. The qualifying conditions reflect that.

Age: Under 3 Years Old

Your company must have been carrying on its qualifying trade for fewer than 3 years at the time SEIS shares are issued. The clock starts when the company begins trading, not when it was incorporated. If your company was dormant for a year before it started trading, that dormant period does not count.

This is stricter than EIS, which allows companies up to 7 years old (or 12 years for knowledge-intensive companies).

Size: Fewer Than 25 Employees

Your company must have fewer than 25 full-time equivalent employees at the time the shares are issued. Part-time employees are counted proportionally. A company with 30 part-time staff working half-days would count as 15 FTEs and still qualify.

Directors who work full-time count towards this limit. If you have two co-founders who are both full-time directors, that is two FTEs before you hire anyone.

Gross Assets: Under 350,000 Pounds

Your company’s gross assets must not exceed 350,000 pounds immediately before the SEIS shares are issued. Gross assets means the total value of everything the company owns before deducting any liabilities. Cash in the bank, equipment, intellectual property, and receivables all count.

This is the condition that catches the most founders. If you have already raised a friends-and-family round or a grant, that cash sits in your gross assets. A company that received a 200,000 pound Innovate UK grant and holds 180,000 pounds of it in the bank is already over halfway to the limit.

Lifetime Fundraising: 250,000 Pounds Maximum

A company can raise a maximum of 250,000 pounds under SEIS across its entire lifetime. This is not per investor or per year. It is the total amount of SEIS investment the company will ever receive.

Once you have used your SEIS allowance, you graduate to EIS for subsequent rounds. Many startups raise their first 150,000 to 250,000 pounds under SEIS and then raise larger EIS rounds as they grow.

UK Permanent Establishment

The company must have a permanent establishment in the UK. It does not need to be incorporated in the UK, but it must have a fixed place of business here from which it conducts its qualifying trade. A purely overseas operation with no UK presence will not qualify.

Not Listed

The company must not be listed on a recognised stock exchange at the time the shares are issued. This rules out AIM-listed companies and any company traded on a recognised exchange. Most early-stage startups are nowhere near listing, so this condition rarely causes issues.

Investor Qualifying Conditions

It is not just the company that must qualify. Investors have their own eligibility rules.

Annual Investment Limit: 200,000 Pounds

An individual investor can invest up to 200,000 pounds per tax year across all SEIS investments combined. If an investor puts 150,000 pounds into your company and 80,000 pounds into another SEIS company in the same tax year, they will only receive SEIS relief on the first 200,000 pounds.

Not Connected to the Company

An investor must not be connected to the company in which they are investing. Connected means being an employee, director, or owning more than 30% of the company (including shares held by associates such as spouses, children, or business partners).

There is an important exception: an investor can become a paid director of the company after investing, provided they were not a director or employee before the shares were issued. This allows angel investors to take board seats, which is standard practice.

Minimum Holding Period: 3 Years

For the investor to keep their income tax relief, they must hold the shares for at least 3 years. If they sell or dispose of the shares within that period, the tax relief is clawed back by HMRC.

Qualifying Trade Rules

The company must be carrying on a qualifying trade. This is a trade conducted on a commercial basis with a view to making profits. HMRC excludes certain activities entirely.

Excluded Trades

The following are not qualifying trades for SEIS purposes:

• Property development — buying, selling, or renting property
• Financial activities — banking, insurance, debt factoring, hire purchase, money-lending
• Legal and accountancy services
• Energy generation — including renewables receiving subsidies or feed-in tariffs
• Hotels and guest houses — operating serviced accommodation
• Farming and market gardening
• Forestry and timber production
• Shipbuilding
• Coal and steel production
• Operating or managing care homes and nursing homes

If any substantial part of your trade falls within an excluded activity, the whole company can be disqualified. HMRC interprets “substantial” as roughly 20% or more of total activity. A SaaS company that also develops property on the side would fail.

Mixed Trades

If your business model touches an excluded area, structure matters. A technology company that builds software for property developers is fine. A technology company that develops property itself is not. The test is what your company does, not who your customers are.

The 70% Spending Requirement

This rule trips up founders who plan to raise SEIS and EIS money in quick succession.

Before your company can raise funds under EIS, it must have spent at least 70% of the SEIS investment on the qualifying business activity. The money must have been genuinely deployed into growing the trade, not just moved between accounts.

In practice, this means you cannot raise 250,000 pounds under SEIS and immediately raise an EIS round. You need to demonstrate that at least 175,000 pounds of the SEIS money has been spent on qualifying activities such as product development, hiring, marketing, or other operational costs.

This requirement exists to ensure SEIS is used for genuine seed-stage investment, not as a stepping stone to access EIS with the money still sitting in the bank. Plan your fundraising timeline accordingly. If you expect to need an EIS round within 6 months, map out exactly how and when the SEIS funds will be deployed.

Key Differences From EIS Eligibility

SEIS is stricter than EIS on every dimension, but offers more generous tax relief in return.

Condition	SEIS	EIS
Income tax relief	50%	30%
Investor annual limit	200,000 pounds	1,000,000 pounds
Company age limit	3 years	7 years (12 for KICs)
Employee limit	25 FTE	250 FTE
Gross assets limit	350,000 pounds	15,000,000 pounds
Lifetime fundraising limit	250,000 pounds	12,000,000 pounds
CGT reinvestment relief	50%	Not available

The higher relief rates are deliberate. SEIS companies are smaller, younger, and riskier. The government compensates investors with more generous tax incentives to encourage investment at the earliest stage.

Common SEIS Eligibility Mistakes

These are the errors that most frequently lead to failed applications or clawed-back relief.

Miscounting gross assets. Founders forget that cash from grants, convertible loans, or previous small investments counts towards the 350,000 pound limit. Always calculate gross assets as of the day before shares are issued.

Unclear trade descriptions. HMRC needs to understand exactly what your company does. Vague descriptions like “technology services” or “consultancy” raise questions. Be specific about your product, your customers, and how you generate revenue.

Connected investors. A co-founder who owns 35% of the company cannot invest further under SEIS. Neither can their spouse. Check connection rules before accepting money from anyone who has a relationship with the company.

Ignoring the 70% rule. Raising SEIS and planning an immediate EIS round without accounting for the spending requirement. Map your cash deployment before you set your fundraising timeline.

Wrong share class. SEIS shares must be ordinary shares that carry no preferential rights to dividends or assets. If your articles of association create preference shares for SEIS investors, the relief will not apply.

How Advance Assurance Confirms Eligibility

SEIS advance assurance is a letter from HMRC confirming that your company is likely to qualify for the scheme. It is not a legal guarantee, but it is the strongest evidence you can show investors.

The advance assurance application covers all the eligibility conditions described in this guide. HMRC reviews your trade description, company structure, share classes, and planned use of funds. If they are satisfied, they issue a letter confirming likely eligibility.

Most angel investors and angel networks will not invest without advance assurance. It removes the risk that their tax relief could be denied after they have committed their money.

You can apply for advance assurance directly to HMRC using form SEIS1, or use an AI-powered service like AdvanceAssured to generate your application at a fraction of the cost of a traditional tax advisor. Either way, apply before you start actively fundraising. HMRC typically takes 6 to 8 weeks to respond.

Check Your Eligibility Now

Not sure whether your company qualifies? Use the free eligibility checker to assess your company against every SEIS condition in minutes. If you pass, you can generate your advance assurance application immediately and submit it to HMRC.

The worst time to discover an eligibility problem is after you have promised investors their tax relief. Check first, fundraise second.