EIS Investments: Are You Missing Out on One of the UK's Most Generous Tax Reliefs?

CGT works two ways here. First, grow the value of your EIS shares and hold them for three years, and that growth is entirely tax-free, no CGT at all. Second, if you're already sitting on a gain from somewhere else, a property sale, a business exit, a share portfolio, you can defer the tax on it by reinvesting into EIS shares. The tax doesn't vanish, though; it's simply deferred until you eventually sell the EIS shares. 

The thing about deferral is you're not avoiding the tax, you're gambling on the rate. Defer a gain today, and you'll pay tax on it later, at whatever the CGT rate happens to be by then, not today's. Whilst there's been plenty of speculation about UK CGT rates rising, nothing's been confirmed as of yet. Nonetheless, this is of course important to factor in before making any deferral decisions. 

The third relief is the one people forget about. Hold EIS shares for two years, and provided you still hold them when you die, they can pass to your beneficiaries completely free of the usual 40% inheritance tax charge. This is due to Business Property Relief, or BPR, and it's one of the more effective tools for estate planning. 

That relief has changed recently, though. From April 2026, it sits inside a new £2.5 million per-person allowance, shared across everything else that might qualify for Business Relief too, other business interests, agricultural property, the lot. Go over that allowance and relief drops to 50% rather than 100%. 

How much of that £2.5 million is actually still available to you depends entirely on what else you're holding, which makes this one worth planning around rather than assuming. 

Add it up: an upfront income tax saving, a way to manage or defer a gain, and a potential inheritance tax benefit down the line. Three reliefs, working together, which is exactly why EIS keeps coming up in tax and wealth planning conversations. 

Not every company. EIS exists to funnel private money into small, unquoted UK trading businesses, the kind that would otherwise struggle to raise finance. AIM-listed companies can qualify too, as long as they're not on the main market. 

Worth flagging if inheritance tax planning is part of your thinking: AIM-listed shares are treated differently for Business Property Relief. From April 2026, they only qualify for 50% relief, in every case, with none of the £2.5 million allowance available to them. Fully unquoted companies, by contrast, still get 100% relief up to that allowance. It's a meaningful difference if IHT is a key part of why you're investing. 

Beyond that, there are some numbers to know: gross assets need to sit under £15 million before your investment and £16 million after, with fewer than 250 full-time staff. Those limits were actually loosened recently, so more growing businesses now qualify than used to. 

Worth remembering: these are unlisted companies, which naturally can result in more investment risk. This is exactly the kind of decision worth talking through with a qualified wealth adviser before you commit anything. 

It's not just the company that has to tick boxes. You do too. 

Relief is only available to individuals investing in their own name, not through a company, and, in most cases, not through a trust either. The shares need to be new ordinary shares, paid for entirely in cash, with no special rights attached and no side arrangement guaranteeing you a return or an exit. 

There's a rule worth knowing here too: you can't receive value from the company around the time of investing, a loan, a discount, preferential terms of any kind. Take more than an insignificant amount and you risk losing the relief altogether. 

And then there's the connection test, which runs across every relief in this article, not just income tax. Broadly, you can't be an employee, hold more than 30% of the shares, or be connected through an associate like a spouse or business partner. There are exceptions for business angels and unpaid directors, but if you're thinking about backing your own business, this is the bit to read twice. 

Once HMRC signs off on the investment, the company sends you a certificate, an EIS3 (or EIS5, if you invested through an approved fund). That's your proof the shares qualify, and you can't claim anything until it arrives. 

From there, there are two simple options: write to HMRC directly with the certificate, or simply include the details in your Self Assessment return for the year the shares were issued, or the year before, if you're carrying the relief back. You've got five years from the 31 January filing deadline to make the claim, though there's little reason to leave it that long. 

The part people often miss is that none of this is locked in just because you invested. Both the company and you need to keep meeting the conditions for three years after the shares are issued, not just on day one. 

If during that window the company moves into a non-qualifying trade, breaches the asset or staff limits, or gets acquired, the reliefs can unravel. This can result in the income tax relief getting clawed back, the CGT exemption disappearing, any deferred gain coming back into charge. Become connected to the company yourself, say by taking a job there, and the same thing happens. 

This is why hanging onto that EIS3 certificate, tracking any deferred gain, and knowing your three-year anniversary actually matters. If anything changes, a sale, a restructure, a new role, flag it before it happens, not once your tax return's already due. 

Early-stage investing obviously can pose more risk. Some of these companies won't make it, and EIS actually plans for that, with a specific loss relief that can soften the blow considerably. 

If the company fails, or you sell the shares, give them away, or they become worthless, the loss you can claim is based on the net cost, what you actually paid, minus any income tax relief you've already banked. That loss can then be set against either income tax or capital gains tax, whichever suits you better, rather than being stuck offsetting gains alone. 

This gives investors a form of safety net in recognition of the fact that these are unquoted companies. 

Say you invest £100,000 and claim £30,000 of income tax relief. Your net cost is £70,000. The company fails, the shares become worthless, you claim loss relief against income at 45% if you are an additional rate taxpayer, this results in a further £31,500 to be relieved. This means an effective loss on a £100,000 investment of around £38,500 in this case. 

And if the shares haven't technically been sold, say the company's stopped trading but hasn't formally wound up, you can still establish a loss through what's called a negligible value claim to HMRC, rather than waiting for the paperwork to catch up. 

One thing that catches people out: if you'd deferred a gain into an investment that's now failed, that gain doesn't disappear with the loss. It's the disposal of the EIS shares that brings it back into charge, so you need to think about the original gain and the new loss together, not assume one cancels out the other. 

As with everything else here, loss relief comes with its own conditions and time limits, and it needs to be claimed properly to count. Build it into your risk assessment before you invest, not after something's gone wrong. Given how much of this depends on your own circumstances, it's always worth getting advice before you commit. 

Before considering an EIS investment, it's worth asking yourself a few honest questions: 

• Will I actually pay enough income tax this year to use the relief in full, 
• do I have a gain sitting somewhere that deferral relief could genuinely help with, 
• could this fit into my inheritance tax planning, and how does it sit against my £2.5 million BPR allowance, 
• am I connected to the company in any way that could jeopardise my claim, 
• and am I genuinely comfortable with the risk, knowing the reliefs soften the blow but don't remove it. 

These are exactly the conversations we'd want to have with you before any EIS investment goes ahead, because the right answer to every one of those questions depends entirely on your own circumstances.