SEIS and EIS: Common pitfalls and best practices.

Article | Jan Fachot | 17th June 2026

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The Seed Enterprise Investment Scheme (SEIS) and the Enterprise Investment Scheme (EIS) are essential for businesses looking for early-stage funding. Most investors expect them to have been considered, and without them, many businesses struggle to get under way. Put simply, they make it easier to raise money by offering generous tax reliefs.

What are the key benefits of SEIS and EIS?

The benefits of SEIS and EIS include:

  • Upfront income tax relief (50% for SEIS, 30% for EIS)
  • Capital gains tax reinvestment relief with partial exemption under SEIS
  • Capital gains tax free exit where shares are held for at least three years
  • Loss relief can be set against income if investment does not work out

Taken together, this significantly shifts the risk-reward profile and continues to help support early-stage investment in the UK.

As you would expect given how generous SEIS and EIS reliefs are, there are strict conditions for the company and investors, alongside other general requirements and compliance processes, which need to be managed carefully from the outset and, in some cases, on an ongoing basis.

Where do issues tend to arise with SEIS and EIS?

The conditions are relatively clear and the difficulty is in applying them in practice. The more common pressure points are:

  • New qualifying trade – particularly for SEIS, earlier activity, even on a small scale, can mean the trade is not “new” in the way the rules require
  • Independence – early-stage structuring or later changes in shareholdings where a corporate is involved creating actual or potential control
  • Use of funds – not aligned with a qualifying trade
  • Shares – must be full-risk and relatively minor features can sometimes prevent this
  • Compliance process – timing, filings and record-keeping

Alongside these, the more mechanical points carry just as much weight. The timing of subscription and issue needs to be right, and funds must be deployed in line with a qualifying activity. These are detail-heavy areas, but often where relief is lost.

An SEIS example in practice

A company raises SEIS funding to develop a new product, having previously generated some consultancy income within the same entity. The funding itself is straightforward, but the analysis is less so: is the activity genuinely “new”, does earlier income suggest continuity, and does the overall plan demonstrate growth and risk in line with the rules? These points tend to be tested when relief is relied on, not when the structure is put in place.

Areas worth keeping in mind

A small number of additional themes tend to recur:

  • advance assurance is useful, but only as good as the facts it is based on
  • founders can, in certain circumstances, still qualify on amounts invested to support the business, provided they are not treated as connected

In most cases, simpler structures and clear, consistent documentation lead to more robust outcomes.

Exit

Where conditions are met, the exit position remains compelling, with gains typically realised free of Capital Gains Tax (CGT) alongside the benefit of earlier reliefs.

Final thoughts

SEIS and EIS are highly effective, but not forgiving. Most risks sit in prior activity, structure and process rather than the underlying business. Getting those right early is usually far easier than trying to address issues later, so getting advice early on is crucial.

If you have any questions on any of the points mentioned in this article, please get in touch with our business tax team.

Key points at a glance

  • SEIS & EIS: UK schemes that help early-stage businesses attract investors through tax incentives.
  • Tax benefits include income tax relief, CGT reliefs, and loss relief to reduce investor risk.
  • Impact: Make early-stage investment more attractive by improving the risk–reward balance.
  • Strict rules: Require careful compliance with eligibility, structure, and ongoing requirements.
  • Common pitfalls often arise with trade qualification, ownership, fund use, share terms, and admin errors.
  • Best practice: Keep structures simple, maintain clear records, and seek advice early.
  • Exit advantage: Qualifying investments can deliver tax-free gains after three years.
  • Bottom line: Highly valuable schemes, but errors in setup and process can easily lead to lost reliefs.

 

 

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About the author

Jan Fachot

Jan joined PEM in 2012 and is a Partner in our Business Tax team, providing tax advisory and compliance services to companies. Read more about this author …