EIS and SEIS Tax Relief Advice in the UK

SEIS and EIS relief is not lost at the point of HMRC enquiry. It is lost months earlier when share structure, timing, or compliance sequencing are misjudged. Legend Fusions helps founders secure Advance Assurance and investors protect their relief. Our team has guided startups to life sciences companies through the entire SEIS/EIS lifecycle. We assess SEIS eligibility rules, calculate EIS loss relief where applicable, and structure the position before capital is deployed, so your relief is secured from day one, not defended later.

Legend Fusions is the UK advisory brand evolved from Legend Financial & Tax Advisers, unifying tax, compliance, and advisory services under one international group.

Serving clients in London, Bolton, Milton Keynes and throughout the UK.  

Why SEIS and EIS Relief Fails

An EIS or SEIS investment is meant to reward risk. You put capital into an early-stage company. In return, HMRC offers income tax relief, CGT exemptions, and loss protection. But relief is only secure if the structure holds. We review positions where it did not.

  • Capital deployed outside qualifying time limits
  • Share rights breaching EIS/SEIS requirements
  • Risk-to-capital condition not satisfied
  • Gross asset or employee thresholds exceeded
  • Connected party status triggered
  • Trade activity entering excluded sectors
  • Incorrect income tax or capital gains tax claims
  • Disposal within the 3-year holding period
  • Late or defective compliance statements

HMRC does not warn you before withdrawing relief. They simply review, reject, and recover.  

We identify exposure before HMRC does.

5 Common and Costly Mistakes to Avoid

HMRC relief is withdrawn for non-compliance, not bad intentions. Avoid these common pitfalls:

  • Claiming relief too early: You must wait until you have received the official EIS3/SEIS3 certificate from the company.
  • Selling shares too soon: Disposing of the shares within the three-year holding period triggers a full clawback of the relief.
  • Breaching company limits: The company must not exceed HMRC’s gross asset or employee thresholds at the time of investment.
  • Inadvertent connected party status: If you’re connected to the company (e.g., a director or employee), you may be excluded from relief.
  • Company moving into an excluded trade: If the company’s trading activity drifts into something HMRC deems ineligible (e.g., property development), relief can be lost.  
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How Legend Fusions Structures EIS & SEIS Engagements

We assess how capital was introduced, how shares were structured, and whether relief conditions were met before HMRC reviews the position. Ownership structure, share class rights, and compliance sequencing determine whether relief is secured or withdrawn. 

For investors:

For founders:

For finance teams and advisors:

This Service is for:

Investors

Higher-rate taxpayers who have made an investment and need to correctly claim their relief.

Founders & Directors

Early-stage companies raising capital who require Advance Assurance from HMRC to attract investors.

Finance Teams & Advisors

Professionals managing compliance statements, investor certificates, and portfolio oversight.

What This Engagement Covers

This engagement reviews how capital is introduced, structured and deployed under SEIS and EIS so relief positions are secured before submission and monitored after issue.

✓ Trade qualification and excluded activity assessment
✓ Risk-to-capital condition review
✓ Advance assurance positioning and documentation review
✓ Share class rights and subscription term confirmation
✓ Capital deployment mapped to qualifying expenditure windows
✓ Compliance statement preparation and submission timing
✓ Income tax relief and capital gains tax deferral review
✓ Post-issue monitoring during the three-year holding period
✓ HMRC enquiry response where relief is challenged

The work focuses on statutory compliance, sequencing accuracy and relief protection under active HMRC interpretation.   

years experience
+
13+ years advising on complex SEIS and EIS structuring, supporting over £75M in qualifying raises, including HMRC advance assurance submissions, compliance reviews and enquiry defence across UK tax positions.

Our Process: From
Investment to Secured Relief

We provide end-to-end support to ensure your position is compliant from day one.

Review

We examine your investment documents, share subscription, and any existing Advance Assurance against HMRC's current rules.

Assess

We verify the company's eligibility i.e. trade test, gross assets, employee limit, and connected person rules.

Calculate

We model your available relief, including income tax, CGT deferral, and potential loss relief, and advise on carry-back opportunities.

File

We support you in making the formal claim via Self Assessment or prepare the company's compliance statement for HMRC.

Monitor

We provide ongoing oversight during the three-year holding period to flag any activities that could jeopardise your relief.

Scope of This Engagement

This engagement covers SEIS and EIS structuring, advance assurance positioning, compliance statement preparation and HMRC enquiry handling. It does not include investment selection, valuation advice, or regulated financial advice under FCA permissions.

What Our Clients Say

“We were about to issue shares when a structuring issue was flagged that would have affected investor relief. It was resolved before the raise progressed.”

Founder, London

“I wanted clarity before claiming EIS relief. My position was reviewed properly and explained in plain terms before anything was submitted.”

Private Investor, Manchester

“Advance assurance and compliance were handled without unnecessary back-and-forth. Everything was positioned correctly from the outset.”

Finance Director, UK

Related Tax & Advisory Services

HMRC Tax Investigations

Response management for HMRC enquiries, compliance checks and formal investigations.

Cross-Border Taxation

Assessment of overseas income, residency position and UK reporting obligations.

R&D Tax Credits

Eligibility review and preparation of claims for qualifying research and development activity.

Personal Tax Planning

Structured review of income, gains and relief positions to manage exposure and filing risk.

Capital Gains Tax

Advisory and reporting support for asset, share and property disposals.

Inheritance Tax

Estate exposure review and structuring of lifetime and succession planning positions.

Capital Allowances

Identification and application of qualifying expenditure within statutory rules.

Common SEIS & EIS Risk Situations We Handle

Advance Assurance Risk

Founder Raise Exposure

Post-Issue HMRC Challenge

Investor Relief Risk

Where We Work

We work with clients across the UK through secure online consultations. In-person meetings are available by appointment at our London office.

What Happens After You Contact Us

  • Initial consultation to understand your investment or fundraise
  • Document review within 48 hours
  • Eligibility assessment and risk report
  • Fixed-fee proposal for agreed scope
  • Work begins within 5 working days 

Timeline For Review and Filing

  • Individual investor claim: 5–7 working days
  • Advance Assurance application: 2–3 weeks
  • Full compliance statement: 3–4 weeks (depending on complexity)

Additional Tax Resources

Understanding common enquiry and compliance risks

Understanding common enquiry and compliance risks

How COP8 and COP9 investigations work

How COP8 and COP9 investigations work

First steps to protect your position

First steps to protect your position

Frequently Asked Questions

What happens if HMRC reject advance assurance?
HMRC refusal delays the raise and weakens investor confidence. Share structure and qualifying status must be corrected before capital proceeds.
Enter the details from your EIS3 certificate on the “Reliefs” section of your Self Assessment return. We can review your certificate and calculation before filing.
You may claim loss relief against income or capital gains. The relief depends on when the shares were acquired and your marginal tax rate.
Yes, SEIS relief can be carried back to the preceding tax year, effectively offsetting income tax from that year. This must be claimed within the normal filing deadlines.
Relief is lost if qualifying trade conditions fail, risk-to-capital is breached, connected party status arises, or shares are disposed early.
Yes. SEIS is typically used first, followed by EIS, subject to funding limits and qualifying conditions.
HMRC review the submission and supporting evidence. Relief remains conditional during the three-year holding period.

Review the Position Before Exposure Arises

Relief withdrawal follows structuring error, not intention.