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What is the seed enterprise investment scheme?

Answered 11 March 2026

Here is a comprehensive overview of the Seed Enterprise Investment Scheme (SEIS):


What the law says

Definition and purpose The SEIS is a scheme providing SEIS income tax relief ("SEIS relief"), defined as entitlement to tax reductions in respect of amounts subscribed by individuals for shares in companies carrying on new businesses.

Commencement The scheme has effect in relation to shares issued on or after 6 April 2012 only.

Eligibility conditions An individual ("the investor") is eligible for SEIS relief in respect of an amount subscribed on their own behalf for shares in a company ("the issuing company") if:

  • the risk-to-capital condition is met;
  • the shares ("the relevant shares") are issued to the investor;
  • the investor is a qualifying investor in relation to the relevant shares;
  • the general requirements (including requirements as to the purpose of the share issue and use of money raised) are met; and
  • the issuing company is a qualifying company in relation to the relevant shares.

Rate and amount of relief The SEIS rate is 50%. The tax reduction is calculated at the SEIS rate on the amount subscribed, capped at £200,000 per tax year (for shares issued on or after 6 April 2023).

Carry-back An investor may elect to treat shares issued in the current tax year as if they had been issued in the preceding tax year, allowing relief to be carried back.

Capital gains re-investment relief In addition to income tax relief, SEIS also provides capital gains re-investment relief under Schedule 5BB to TCGA 1992.

Withdrawal of relief If SEIS relief falls to be withdrawn or reduced, it must be withdrawn by the making of an assessment to income tax for the tax year for which the relief was obtained.


HMRC guidance / practice

Policy purpose HMRC describes SEIS as intended to encourage individuals to subscribe for shares in small, early-stage companies that would otherwise struggle to raise finance to support their growth and development.

Relationship to EIS SEIS was introduced in April 2012 to run alongside the existing Enterprise Investment Scheme (EIS). The relief rate of 50% differs from that available under EIS.

Compliance certificate (SEIS3) An investor cannot claim SEIS income tax relief until the issuing company sends a compliance certificate (form SEIS3) to the investor. Companies cannot issue SEIS3 certificates without first obtaining authorisation from HMRC and a Unique Investment Reference (UIR) number.

Qualifying company conditions The issuing company must satisfy conditions relating to: trading, carrying on a qualifying business activity, UK permanent establishment, financial health, unquoted status, control and independence, no partnerships, gross assets (up to £350,000 for shares issued on or after 6 April 2023), number of employees, no previous other risk capital scheme investments, the amount raised through the SEIS (up to £250,000), qualifying subsidiaries, and property managing subsidiaries.

Ongoing compliance The company must observe certain rules not just at the time of investment but for at least three years afterwards. If it fails to meet those rules, tax relief will not be given or, if already given, will be withdrawn.

Claiming relief

  • Relief is claimed at box 10 of the 'Other tax reliefs' section of the Additional Information page (Ai2) of the Self Assessment return.
  • The deadline for making a claim is five years after the normal Self Assessment filing date of the relevant tax year.

Citation sources

1 MANUAL
Venture Capital Schemes Manual: the Seed Enterprise Investment Scheme: income tax relief: company and investor procedures: overview

The Seed Enterprise Investment Scheme (SEIS) is intended to encourage individuals to subscribe for shares in small, early-stage companies that would otherwise struggle to raise finance to support their growth and development. Individuals whose investments meet the scheme conditions are eligible to a range of tax reliefs. Investors should be aware that the company has to observe certain rules, not just at the time of the investment but for at least three years afterwards. If it fails to meet thos

HMRC guidance
2 LEGISLATION
Income Tax Act 2007

PART 5A Seed enterprise investment scheme CHAPTER 7 Withdrawal or reduction of SEIS relief: procedure Assessments and appeals Assessments for the withdrawal or reduction of SEIS relief 257G If any SEIS relief which has been obtained falls to be withdrawn or reduced under Chapter 6, it must be withdrawn or reduced by the making of an assessment to income tax for the tax year for which the relief was obtained.

Primary legislation
3 LEGISLATION
Income Tax Act 2007

PART 5A Seed enterprise investment scheme CHAPTER 1 Introduction SEIS relief Meaning of “SEIS relief” and commencement 257A 1 This Part provides for SEIS income tax relief (“SEIS relief”), that is, entitlement to tax reductions in respect of amounts subscribed by individuals for shares in companies carrying on new businesses. 2 In this Part “SEIS” stands for the seed enterprise investment scheme. 3 This Part has effect in relation to shares issued on or after 6 April 2012 only. 4 . . . . . . . .

Primary legislation
4 LEGISLATION
Finance (No. 2) Act 2023

Part 1 Income tax, corporation tax and capital gains tax Other reliefs relating to businesses Seed enterprise investment scheme: increase of limits etc. 15 1 Part 5A of ITA 2007 (seed enterprise investment scheme) is amended in accordance with subsections (2) to (5) . 2 In section 257AB (form and amount of SEIS relief), in subsection (2)(b), for “£100,000” substitute “£200,000” . 3 In section 257DI (the gross assets requirement)— a in subsection (1), for “£200,000” substitute “£350,000” ; b in s

Primary legislation
5 MANUAL
Returns: individuals returns: claim to relief for SEIS (seed enterprise investment scheme)

The Seed Enterprise Investment Scheme (SEIS) was introduced in April 2012 to run alongside the existing Enterprise Investment Scheme (EIS). For further information regarding EIS, see SAM121400. Where the taxpayer claims income tax relief for SEIS on the return, the claim must be made at box 10 of the ‘Other tax reliefs’ section of the Additional information page Ai2. Relief is given at 50 per cent of the cost of the qualifying shares acquired on, or after, 6 April 2012 and is given in terms of t

HMRC guidance
6 MANUAL
SEIS: income tax relief: issuing company requirements: overview

This part of the manual deals with the rules applying to the investee company - that is, the company issuing the shares. Guidance on investor requirements is at VCM32000+ and general requirements is at VCM33000+. The issuing company must be a ‘qualifying company’. To be a qualifying company it must satisfy certain conditions to do with: Trading (see VCM34020 and VCM34030), Carrying on a qualifying business activity (see VCM34040), UK permanent establishment (see VCM34050), Financial health (see

HMRC guidance
7 LEGISLATION
Income Tax Act 2007

PART 5A Seed enterprise investment scheme CHAPTER 1 Introduction SEIS relief Eligibility for SEIS relief 257AA An individual (“the investor”) is eligible for SEIS relief in respect of an amount subscribed by the investor on the investor's own behalf for an issue of shares in a company (“the issuing company”) if— za the risk-to-capital condition is met (see section 257AAA), a the shares (“the relevant shares”) are issued to the investor, b the investor is a qualifying investor in relation to the

Primary legislation
8 LEGISLATION
Income Tax Act 2007

PART 5A Seed enterprise investment scheme CHAPTER 1 Introduction SEIS relief Form and amount of SEIS relief 257AB 1 If an individual— a is eligible for SEIS relief in respect of any amount subscribed for shares, and b makes a claim in respect of all or some of the shares included in the issue, the individual is entitled to a tax reduction for the tax year in which the shares were issued (“the current tax year”). This is subject to the provisions of this Part. 2 The amount of the tax reduction to

Primary legislation
9 LEGISLATION
Taxation of Chargeable Gains Act 1992

Part IV Shares, securities, options etc. Chapter III Miscellaneous provisions relating to commodities, futures, options and other securities Seed enterprise investment scheme: re-investment 150G Schedule 5BB to this Act (which provides relief in respect of re-investment under the seed enterprise investment scheme ... ) has effect.

Primary legislation