SEIS/EIS In 2026: Founder-Friendly Guide To Eligibility, Advance Assurance and Investor FAQs

If you are planning a spring raise, getting SEIS/EIS right can unlock your round. It reduces investor risk, speeds decisions, and signals you run a clean ship. This guide explains who qualifies, what the 2026 limits look like, how advance assurance works, the documents investors expect, how options and future rounds interact, and the pitfalls that slow you down.

 

Quick refresher: what is SEIS and EIS?

SEIS and EIS are UK schemes that give tax reliefs to investors who buy new shares in early stage companies. If you are at pre-seed or seed, SEIS is usually first. As you grow, EIS supports larger follow on rounds.

• SEIS: for very early stage companies with strict age and size tests. Offers higher income tax relief on smaller investments.
• EIS overview: for growing companies that remain relatively small and young. Offers strong income tax relief and loss relief on larger investments.

 

Eligibility in 2026, the current limits and key timelines

Note: HMRC guidance and the Finance Acts set the rules. The below reflects the current framework commonly applied in 2026 planning. Always confirm your exact facts before committing terms.

 

Company eligibility, SEIS:

• Age limit: you must issue SEIS shares within three years of your first commercial sale. Certain pivots or new trades can reset this, but do not rely on that without advice.
• Gross assets: not more than £350,000 immediately before the SEIS round.
• Employees: fewer than 25 full time equivalent employees.
• Funding cap: up to £250,000 lifetime SEIS funds, including any de minimis state aid that counts toward the cap.
• Trading: a qualifying trade that is genuinely risky. Some trades are excluded, such as banking, property development, legal and accountancy services, and energy generation.
• No prior EIS or VCT investment before SEIS. SEIS must come first.

 

Company eligibility, EIS:

• Age limit: typically within seven years of first commercial sale at the time of the first EIS investment. Knowledge intensive companies can have extended age and funding limits.
• Gross assets: not more than £15 million before the round and not more than £16 million immediately after.
• Employees: fewer than 250 employees, or 500 for knowledge intensive companies.
• Funding cap: up to £12 million lifetime risk finance investment, rising to £20 million for knowledge intensive companies. Annual caps also apply.

 

Investor eligibility, both schemes:

• Investors must not be connected to the company via substantial employment or significant shareholdings, and cannot receive value that would taint relief.
• Shares must be ordinary, fully paid in cash, with no preferential rights to assets on winding up and no redemption rights.
• Minimum holding period: three years from the share issue date, or from the trade start date if later.

 

Investor limits:

• SEIS: up to £200,000 per tax year at 50% income tax relief.
• EIS: up to £1 million per tax year, or £2 million if at least £1 million is invested in knowledge intensive companies, at 30% income tax relief.

Can you apply for SEIS and EIS at the same time?

Yes, if your round contains a SEIS tranche and an EIS tranche, you can seek advance assurance covering both. The order matters; SEIS shares must be issued before any EIS shares, and you must remain within SEIS limits at the point of SEIS issuance. Structuring is common, for example, closing a SEIS sub tranche first, then an EIS completion immediately afterward.

The three year holding rule and timing traps

Relief is conditional on a three year holding period. If the company is acquired or the shares are sold early, relief can be withdrawn or reduced. Beware of the following:

• Early share redemptions or buy backs.
• Agreements that protect investor capital or guarantee returns.
• Loan notes or convertibles that have redemption rights or fixed returns.
• Preference shares with prohibited rights.

If you need bridging capital, ensure the instrument is EIS compatible or sits outside the relief to avoid tainting the round.

 

Advance assurance, how long it takes and what to submit

Advance assurance is an HMRC indication that your company and planned share issue are likely to qualify if you follow through as described. It is not a final approval, but investors expect it.

 

Typical timelines:

• Standard cases: 4 to 6 weeks from complete submission to decision.
• Complex structures or missing documents: 8 to 12 weeks or more.
• Peak periods: expect slower responses in late Q1 and Q2 when fundraising peaks.

 

What to include:

• Cover letter summarising your trade, round size, SEIS/EIS split, use of funds, and cap table.
• Business plan and financial forecasts showing how funds will be used for growth.
• Latest management accounts and statutory accounts if available.
• Current cap table, proposed post money cap table, option pool details.
• Details of any advance subscriptions, SAFE or convertible instruments, and any debt.
• Draft investment documents: term sheet, articles, subscription and shareholders agreement.
• Confirmation of your first commercial sale date and any earlier state aid.

 

How to speed it up:

• Keep Companies House filings aligned with the real cap table. Fix missing CS01 confirmations, director changes, and allotments.
• Produce up to date management accounts, cash flow and commentary. Post your month end before submission and reconcile bank accounts. This gives HMRC confidence in your records.
• Avoid missing or contradictory figures between forecasts, management accounts and Companies House.

Documents investors expect before wiring

• HMRC advance assurance letter referencing your business and the specific scheme.
• Clean, reconciled management accounts and a short narrative on use of funds.
• A simple cap table with fully diluted ownership, including all options and convertibles.
• Articles that match SEIS/EIS requirements, with ordinary shares for investors.
• Subscription and shareholders agreement with no clauses that would protect capital in a way that taints relief.
• A credible 18 to 24 month plan, including revenue forecasting and cash runway.

How SEIS/EIS interact with future rounds and option schemes

• Future rounds: You can raise multiple EIS rounds while you remain within age, size and lifetime caps. Each subsequent round must still meet risk to capital and growth requirements.
• Option schemes: EMI options are compatible with SEIS/EIS. Option holders are not treated as connected for relief unless they hold more than 30% of the company. Keep option pool mechanics clear and documented. Grant options over ordinary shares without prohibited rights, and record grants promptly.
• Convertible instruments: ASAs that meet HMRC guidance can work. Avoid interest, redemption rights or valuation protections that undermine risk. For SAFEs, align terms to HMRC principles or keep them outside the relief perimeter and convert after an equity round.
• Reorganisations: Share for share exchanges and group reorganisations can break the three year clock or relief. Get advice before any restructure.

Common pitfalls that derail relief

• Issuing preference or redeemable shares to investors who expect SEIS/EIS.
• Completing EIS shares before SEIS shares in a mixed round.
• Backdating first commercial sale or failing to evidence it.
• Using funds for disqualifying activities such as acquiring another company’s shares rather than growing your own trade.
• Connected investors receiving value, such as consultancy fees, rent or non commercial benefits.
• Sloppy filings, for example, unreported allotments or inconsistent share classes on Companies House.

Risks and investor FAQs you should be ready for

• What happens if the company fails? Investors may claim income tax relief and loss relief against capital losses. Explain the mechanics simply and provide links to HMRC guidance where relevant.
• Can investors sell inside three years? Yes, but relief is likely to be withdrawn or reduced. Make this clear.
• When do investors get certificates? After the round closes and the company has traded for four months, or spent 70% of the funds, you can apply for the compliance statement and issue the eis certificate to each investor. Build this timeline into post close communications.
• Will a secondary sale qualify? No, relief applies only to newly issued shares subscribed in cash.
• Can directors invest? Yes, but watch connection tests. A paid director can claim EIS in certain circumstances, but seek advice early and document roles.

How clean finance speeds assurance and investor trust

Treat SEIS/EIS as part of fundraising operations, not a side task. A few hygiene steps save weeks:

• Run a tidy month end in Xero before you apply, and share management accounts with clear commentary. Investors will expect kpi reporting that matches your deck.
• Keep your cap table single source of truth, and mirror it on Companies House promptly after allotments.
• Document all instruments and avoid ambiguous side letters or emails that imply protections.

Summary and next steps

SEIS/EIS can reduce investor risk and unlock your round, but only if you plan ahead. Confirm eligibility, structure SEIS before EIS, keep to ordinary shares, and protect the three year rule. Submit a complete advance assurance pack and keep your financials and cap table clean so HMRC and investors can move fast.

 

If you want a fast, low stress process, we can help you prepare your SEIS/EIS advance assurance, tidy your management accounts, and draft the compliance statements after completion. Book an SEIS/EIS readiness review with Venn to get your round moving.