If you’re building a tech business in the United Kingdom (UK), two questions tend to come up early: how do you raise the money to keep building, and how do you keep talented people on board when you cannot yet pay what larger employers can?
Seed Enterprise Investment Scheme (SEIS), Enterprise Investment Scheme (EIS) and Enterprise Management Incentives (EMI) sit right in the middle of those decisions. SEIS and EIS can make early-stage investment more attractive to qualifying investors, while EMI can help eligible companies offer employees a stake in the value they are helping to build.
The reliefs are meaningful. SEIS can offer 50% income tax relief on qualifying investments, and EIS can offer 30%, subject to the relevant limits and conditions. From 6 April 2026, EMI options can also have a longer 15-year exercise window, giving growing companies more flexibility when using options to reward and retain employees.
The catch is that all three depend heavily on timing, structure and paperwork. If one detail is wrong, the relief you hoped would help bring investors in, or the option promise you made to a key hire, may not hold up when it is tested.
SEIS is built for very early-stage businesses. To qualify, a company generally needs to be less than three years old, have fewer than 25 employees and hold gross assets of no more than £350,000. A company can raise up to £250,000 in total under the scheme. In return, qualifying investors may receive 50% income tax relief, capital gains tax exemption on shares held for at least three years, and loss relief if things don’t work out.
In practical terms, an investor putting £100,000 into an SEIS-qualifying company could reduce their income tax bill by up to £50,000 in the same tax year. If the company later fails, loss relief may reduce the remaining exposure further. That combination is why SEIS can make very early rounds easier for angels to consider, even where the business is still pre-revenue.
The company still needs to be carrying on a qualifying trade. The list covers most tech activities but excludes a handful, including financial trading, property development and certain professional services. Software, SaaS, AI and most deep-tech businesses are typically fine, but the qualifying-trade test is worth checking early rather than late.
For founders, the practical value is clear. At the earliest stage, you may be asking investors to back a business with little revenue, an unproven commercial model and a product that is still developing. SEIS does not remove that risk, but it can make the investment easier for angels to live with, provided the business case stands on its own.
Most founders apply to HMRC for Advance Assurance before completing a qualifying round. It is not compulsory, but it can give investors comfort that HMRC is likely to accept the company’s position, and it also forces the structure to be thought through before the round starts.
EIS picks up where SEIS leaves off. It is usually the scheme founders look at for the seed or early growth round that follows the first SEIS raise. That matters because many software, AI and deep-tech businesses need more than one funding round before they reach meaningful scale.
The April 2026 reforms made EIS more useful for scaling companies. From 6 April 2026, the annual company investment limit increased to £10 million, or £20 million for knowledge-intensive companies. The lifetime limit increased to £24 million, or £40 million for knowledge-intensive companies. The gross assets test also increased to £30 million before investment and £35 million after investment. That gives companies more headroom to keep raising EIS-qualifying capital as they grow.
For an angel writing a £50,000 EIS cheque, the headline relief is £15,000 back through income tax in the year of investment, plus capital gains tax exemption if the shares are held for at least three years. If the three-year holding period is broken, or the company stops qualifying during that period, HMRC can claw the relief back.
That is why experienced investors care about more than the initial round structure. They are buying shares, but they are also relying on a tax position that depends on the company continuing to behave in the right way for several years.
The trade-off is that EIS only works when the round is structured to fit it. A founder might accept money quickly to keep momentum going, or agree investor rights that seem harmless at the time, only to discover later that those rights have caused an EIS problem. At that point, the issue becomes commercial. Investors pause, ask for changes or want more comfort before releasing funds. None of that is always fatal, but it costs time and goodwill when the round should be moving forward.
EMI is all about employees and lets eligible companies grant qualifying share options to employees on a tax-efficient basis, which is often the deciding factor in getting strong people through the door before you can match higher salaries.
The April 2026 changes widened the scheme significantly. The qualifying employee cap increased from 250 to 500, the gross assets limit increased from £30 million to £120 million, and the total company-wide option pool doubled to £6 million. The maximum holding period also moved from 10 to 15 years, which is useful for scale-ups whose options might otherwise drift towards the old 10-year limit. From April 2027, the requirement to notify HMRC of each EMI grant is also being removed
The tax treatment is what makes EMI valuable. Provided the option was granted at or above market value, agreed with HMRC in advance, and the scheme rules are followed, the employee should not pay income tax or National Insurance on exercise. They usually pay capital gains tax when they sell, often at a lower rate than income tax.
For a senior hire comparing your offer with another opportunity, the difference in take-home value can be significant.
What founders cannot afford to do is treat options casually. It is easy to talk about “options” during hiring before there is a valuation, scheme or grant documentation in place. That creates a gap between what the candidate thinks they are getting and what the company can actually deliver. The longer that gap sits, the harder it becomes to close cleanly.
When an investor is ready to wire money or a key hire is waiting on their offer, it can be tempting to tidy up the legal and tax paperwork afterwards.. These schemes turn on what happens before money is taken or options are granted, and by the time the paperwork gets proper attention, the window to fix the structure may already have closed.
Founders often rely on templates or documents that weren't built for UK tax-relief rounds. A United States-style Simple Agreement for Future Equite (SAFE) is a common example. It can take money in quickly, but it rarely supports SEIS or EIS unless adapted.
The same issue can arise with convertible notes, where the conversion terms don't match what HMRC requires for relief. EMI has its own version of the problem. Founders sometimes describe options to a candidate in conversation, but until the scheme is set up and the grant is properly documented, the option doesn't actually exist.
As the company grows, important records can become scattered across drives, inboxes shared folders. Drafts start to blur with signed final versions. By the time an investor asks about the company’s SEIS position or EMI grants at the next round, the answer should take minutes to find, not a fortnight of detective work.
Get advice before the company makes commitments that are hard to undo. That means before shares are issued or money is accepted on terms that could affect SEIS or EIS relief. It also means before specific option terms are promised to a candidate, and before the next funding round opens. A short review at any of those points can catch issues that would otherwise become live negotiation problems later.
If there is one mindset shift these schemes ask of founders, it is to stop treating SEIS, EIS and EMI as “tax topics”. They are commercial tools that happen to involve tax rules. The investor who pulls out because the share rights do not qualify is not really pulling out over tax. The hire who feels misled about their options does not feel misled about tax either.
These schemes affect how funding is raised, how early employees are rewarded and how ownership is managed as the company grows. Once they are built properly into the company’s early structure, they can support growth without becoming something founders have to keep fixing later.