To claim SEIS and EIS tax relief in the UK, an individual investor must first obtain an official SEIS3 or EIS3 compliance certificate from the issuing company. Once received, the investor enters the investment amount, company details, and HMRC reference number on the SA101 supplementary page (boxes 10 to 13) of their annual Self-Assessment tax return, or submits the certificate directly to HMRC to adjust their PAYE tax code.
Claiming UK government venture tax incentives should not feel like translating hieroglyphs. When done correctly, the Seed Enterprise Investment Scheme (SEIS) and Enterprise Investment Scheme (EIS) let you offset up to 50% or 30% of your investment directly against your income tax bill. Yet, missing a single form or box on your tax return can delay your tax rebate for months. This walkthrough breaks down the exact procedure for founders issuing the paperwork and investors claiming the tax relief.
The Direct Route to Claim SEIS and EIS Tax Relief
Getting your tax relief back from HM Revenue & Customs (HMRC) involves a two-part relay race between the startup and the investor. First, the startup issues ordinary shares, spends the capital according to strict statutory guidelines, and files compliance papers to secure official certificates. Second, the investor takes that certificate and logs their claim on their personal tax return or PAYE code. You can explore curated opportunities via Tax saving investments to see how qualified startups structure these rounds.
Navigating this administrative process requires strict attention to deadlines and HMRC documentation standards. While the paperwork might look daunting at first glance, the rules follow a predictable timeline. Once you understand which forms belong to the founder and which belong to the investor, you can execute the claim with complete confidence.
What Are SEIS and EIS Tax Reliefs?
Before digging into the compliance workflow, let us review what these incentives actually offer UK taxpayers. The UK government designed both programmes to channel private capital into early-stage, innovative businesses, balancing higher investment risk with substantial tax advantages.
Seed Enterprise Investment Scheme (SEIS)
SEIS targets early-stage, seed-level startups. Because backing a very young business involves significant financial risk, HMRC offers some of the most aggressive tax breaks available anywhere in the world:
- Income Tax Relief: You can claim up to 50% income tax relief on qualifying investments up to £200,000 per tax year.
- Capital Gains Tax (CGT) Reinvestment Relief: If you realise a capital gain on another asset (such as property or listed shares) and reinvest that gain into SEIS-qualifying shares, you can claim 50% CGT exemption on that gain.
- Tax-Free Growth: You pay zero capital gains tax when selling SEIS shares that you have held for at least three full years, provided you claimed and retained income tax relief.
- Loss Relief: If the startup fails, you can offset your net loss (the original investment minus any income tax relief already received) against your income tax or capital gains tax.
To learn more about the scheme mechanics for early-stage companies, you can review our guide to SEIS startup investment.
Enterprise Investment Scheme (EIS)
EIS applies to slightly more mature, scale-up businesses seeking larger growth rounds:
- Income Tax Relief: Claim up to 30% relief on investments up to £1 million per tax year, or up to £2 million if investing in knowledge-intensive companies (KICs).
- CGT Deferral Relief: You can defer paying capital gains tax on gains made from selling another asset if you invest those proceeds into qualifying EIS shares within three years after, or one year before, the disposal.
- Loss Relief: Similar to SEIS, you can deduct the net loss against your taxable income or capital gains if the company winds up.
- Inheritance Tax (IHT) Relief: EIS shares generally qualify for Business Property Relief (BPR) once you have owned them for two years, potentially exempting them completely from your taxable estate.
For investors assessing scale-up businesses, our breakdown of EIS startup investment provides comprehensive details on company eligibility.
Part 1: How Startups Issue SEIS3 and EIS3 Certificates
Investors cannot claim tax relief until the investee company finishes its compliance obligations with HMRC. A founder cannot simply write an invoice or sign a personal receipt; HMRC requires formal compliance filings.
Step 1: Secure Advance Assurance (Recommended)
While Advance Assurance is not legally mandatory, smart founders apply for it before raising external funding. Advance Assurance is HMRC’s provisional confirmation that your company structure, share classes, and trading activities satisfy the statutory criteria for SEIS or EIS. Having this written confirmation in hand gives angel investors confidence before they transfer funds.
Step 2: Issue Ordinary Shares and Deploy Capital
To qualify under the rules, the shares issued must be full-risk, non-redeemable ordinary shares paid for in full, in cash. The company cannot issue preference shares carrying guaranteed dividend rights. Furthermore:
- For SEIS: The business must have spent at least 70% of the funds raised on qualifying business activities, or traded for at least four months, before submitting its compliance statement.
- For EIS: The business must have been actively trading for at least four months before filing its statement.
Founders looking to raise money and prepare their cap tables can explore Startup funding for entrepreneurs.
Step 3: Submit Form SEIS1 or EIS1 to HMRC
Once the trading or spending condition is met, the company submits a formal compliance statement via HMRC’s online portal:
- Form SEIS1 for Seed Enterprise Investment Scheme raises.
- Form EIS1 for Enterprise Investment Scheme raises.
This application includes the company’s accounts, articles of association, details of the qualifying trade, investor schedules (names, addresses, National Insurance numbers, and amounts invested), and an explanation of how the proceeds will be used.
Step 4: Receive HMRC Authorisation and Issue Certificates
Once HMRC’s Small Company Enterprise Centre (SCEC) reviews and approves the submission, they issue an authorisation letter containing a Unique Investment Reference (UIR). Along with this, HMRC grants permission for the company to issue official certificates:
- Form SEIS3 for SEIS investors.
- Form EIS3 for EIS investors.
Company directors fill in the investor’s specific share details, sign the forms, and send them to the individual investors. Investors must keep these forms safe, as they are mandatory evidence for any relief claim.
Part 2: How Investors Claim SEIS and EIS Tax Relief
Once you receive your SEIS3 or EIS3 certificate, you can claim your income tax reduction. You do not need to send the physical certificate to HMRC right away, but you must retain it in case HMRC conducts a compliance check.
Method 1: Self-Assessment Tax Return (Online)
Most angel investors complete an annual Self-Assessment tax return (Form SA100). Claiming online is the most direct approach:
- Log in to HMRC Online Services: Access your government gateway account.
- Navigate to “Tailor Your Return”: In section 3 of your online tax return, look for the question: “Did you make any subscriptions for shares which qualify for Enterprise Investment Scheme or Seed Enterprise Investment Scheme relief?” Check Yes.
- Go to Supplementary Form SA101 (Additional Information): Under the section titled “Reliefs for which you need to fill in an additional form”, open the SEIS and EIS entry fields.
- Complete the Input Boxes:
- Box 10 (EIS): Enter the total amount invested in EIS qualifying companies for which you hold an EIS3 certificate.
- Box 11 (SEIS): Enter the total amount invested in SEIS qualifying companies for which you hold an SEIS3 certificate.
- Boxes 12 and 13: Enter any amounts you wish to carry back to the previous tax year.
- Provide Details in the White Space (Box 21 / Additional Information): HMRC requires specific data for every claim. In the notes section, type:
- The full name of the company invested in.
- The date the shares were issued.
- The unique investment reference (UIR) from your SEIS3 or EIS3 form.
- The HMRC office that issued the certificate.
- If you are claiming carry-back relief, the amount applicable to each year.
- Submit Your Return: Your tax liability calculation will update automatically, reducing your net income tax payable by 50% (for SEIS) or 30% (for EIS) of the eligible sum.
Method 2: Adjusting Your PAYE Tax Code (Mid-Year Claim)
If you are an employed taxpayer paying income tax through PAYE, you do not have to wait until the end of the tax year to enjoy your relief. You can claim mid-year by completing the claim section printed directly on page 3 and 4 of your physical SEIS3 or EIS3 certificate.
- Complete parts 1 and 2 on the certificate itself, declaring your investment amount and claiming your relief.
- Post the original signed certificate to your local HMRC tax office.
- HMRC will adjust your PAYE tax code. This increases your personal tax-free allowance for the remaining months of the tax year, reducing the tax deducted from your monthly salary.
Using the Carry-Back Facility to Maximise Savings
One of the most effective planning features of both SEIS and EIS is the carry-back concession. HMRC permits you to treat all or part of an investment made in the current tax year as if it were made in the immediately preceding tax year, provided you have not exceeded your annual limit in that previous year.
Carry-Back Example
Suppose you invest £40,000 in an SEIS-eligible business during the 2024/25 tax year. However, your income was significantly higher in 2023/24, resulting in a larger tax liability that year.
- You can elect to carry back the entire £40,000 investment to the 2023/24 tax year.
- At 50% relief, this generates a £20,000 reduction against your 2023/24 income tax liability.
- If you have already paid your 2023/24 Self-Assessment bill, HMRC will issue a direct cash refund for the difference.
To use this facility, enter the carry-back portion into Box 12 (EIS) or Box 13 (SEIS) of your current return, or file an amendment to your previous year’s tax return within twelve months of the statutory filing deadline.
How Capital Gains Tax (CGT) Relief Works
Beyond basic income tax reduction, both schemes provide substantial capital gains benefits.
SEIS Capital Gains Reinvestment Relief
If you sell an asset (such as second residential property, shares, or art) and realise a capital gain, you normally owe Capital Gains Tax. If you reinvest those proceeds into an SEIS-qualifying company in the same tax year, you can claim 50% exemption from CGT on that gain.
- Maximum relief: 50% exemption on gains up to £200,000 (equating to a £100,000 exempt gain).
- Mechanism: Claimed via the Capital Gains summary supplementary pages (SA108) on your Self-Assessment return.
EIS Capital Gains Deferral Relief
EIS does not offer an immediate 50% exemption on gains from other assets, but it offers deferral relief. You can defer any amount of capital gain if you reinvest it into EIS shares.
- Timeline: You must purchase the EIS shares between one year before and three years after the date the original gain was realised.
- Benefit: No CGT is payable on that original gain until you sell the EIS shares (or trigger another chargeable event). If you hold the EIS shares until death, the deferred gain drops away entirely, as capital gains are wiped out on death.
How to Claim Loss Relief If a Startup Fails
Early-stage investing involves genuine financial risk; some companies inevitably fail. However, HMRC mitigates this downside by providing Loss Relief under Section 131 of the Income Tax Act 2007.
Loss relief allows you to offset your effective loss against your total taxable income (taxed at rates up to 45%) rather than just against capital gains (which are taxed at lower rates).
Calculating SEIS Loss Relief for an Additional-Rate Taxpayer
Consider an investor subject to the 45% additional tax rate who invests £10,000 into an SEIS startup that subsequently winds up:
- Initial Investment: £10,000
- Initial SEIS Income Tax Relief (50%): £5,000
- Effective Cost Basis at Risk: £5,000
- Loss Relief at 45% Marginal Rate: £5,000 × 45% = £2,250
- Total Tax Saved: £5,000 + £2,250 = £7,250
- Total Net Out-of-Pocket Loss: £2,750 (representing only 27.5% of the original investment)
To claim loss relief, complete the Capital Gains summary (SA108) of your Self-Assessment return, elect to set the loss against income under Chapter 6 of Part 4 of the Income Tax Act 2007, and detail the loss in the accompanying notes box.
Critical Rules and Common Traps to Avoid
HMRC polices SEIS and EIS compliance strictly. If you run afoul of statutory restrictions, HMRC can claw back all income tax relief and cancel capital gains exemptions.
| Compliance Restriction | Rule Requirement | Consequence of Breach |
|---|---|---|
| Holding Period | Must retain ordinary shares for at least 3 years from issue date. | Full clawback of income tax relief plus interest charges. |
| Substantial Interest | Investor cannot hold more than 30% of ordinary share capital or voting rights. | Total disqualification of SEIS/EIS tax relief. |
| Employment Connection | Investors cannot be employees (SEIS allows unremunerated directors; EIS allows Business Angels under specific rules). | Relieved status revoked. |
| Pre-arranged Exit | Shares cannot be issued with arrangements to protect the investor against risk or guarantee repurchase. | Complete loss of tax-advantaged status. |
| Spending Condition | 70% of SEIS funds must be spent before filing compliance forms. | Rejection of Form SEIS1 by HMRC. |
Accountants and financial advisers looking to assist client portfolios can explore SEIS EIS support for accountants for administrative workflows.
Frequently Asked Questions
How long does HMRC take to process an SEIS3 or EIS3 certificate?
It typically takes between 15 and 45 business days for HMRC to process Form SEIS1 or Form EIS1 after the company submits it. Once approved, the company receives the certificates immediately and sends them to investors. Investor Self-Assessment claims filed online are processed alongside standard tax returns, usually within a few weeks.
Can I claim SEIS or EIS relief if I do not pay enough UK income tax?
Income tax relief cannot exceed your total income tax liability for the year. For example, if you are entitled to £15,000 in EIS relief but your total UK income tax bill for the tax year is only £10,000, your relief is capped at £10,000. You cannot roll the unused £5,000 forward, although you can carry it back to the prior tax year if you had sufficient liability then.
What is the deadline for claiming SEIS or EIS tax relief?
You must claim relief up to five years after the 31 January following the end of the tax year in which the shares were issued. For instance, for shares issued in the 2023/24 tax year (which ended 5 April 2024), the 31 January deadline is 31 January 2025. You have until 31 January 2030 to submit a claim.
Do I need to attach the physical SEIS3 or EIS3 form to my online tax return?
No. If you submit your Self-Assessment tax return through the HMRC online portal or commercial tax software, you do not need to attach or upload the form. You simply enter the required details into the SA101 supplementary section. However, you must keep the physical or digital certificate in your tax records, as HMRC may request it during a routine enquiry.
Can I claim relief on shares held in a SIPP or Stocks and Shares ISA?
No. SEIS and EIS qualifying shares must be held directly in your personal name by an individual UK taxpayer. They cannot be held inside tax-wrapped accounts like an Individual Savings Account (ISA) or a Self-Invested Personal Pension (SIPP).
Take Action on Your Tax Planning
Whether you are an angel investor looking to optimise your annual income tax liability or a founder preparing to issue tax certificates to your cap table, staying ahead of administrative rules ensures you capture the full benefits of UK venture relief.
Browse vetted, high-growth startups and tax-advantaged offerings on the Tax saving investments marketplace to build a robust, tax-efficient portfolio today.
