Here's the bit nobody tells you when you write your first early-stage cheque: the tax relief doesn't arrive on its own. You don't get a rebate in the post. You claim it - and the claim hangs on one piece of paper the company has to send you first.
That paper is the SEIS3 or the EIS3, the compliance certificate. For the Seed Enterprise Investment Scheme it's an SEIS3; for the bigger Enterprise Investment Scheme it's an EIS3. Same job in both cases: it tells HMRC that the company has issued you qualifying shares, and it gives you the reference number you'll need to claim. No certificate, no relief. So before anything else - if you've invested and you're holding nothing, chase the company.
What are the SEIS3 and EIS3 certificates?
Think of the certificate as the company's permission slip, signed off by the taxman. After your shares are issued, the company submits a compliance statement (the SEIS1 or EIS1) to HMRC. Once HMRC is satisfied the company and the shares qualify, it authorises the company to issue investors their certificates. The company then sends you the SEIS3 or EIS3.
On it you'll find the company's name, the amount you invested, the date of issue, the relief available, and - the part that matters at filing time - a unique investment reference and the name of the HMRC office that authorised it. You'll be typing both into your tax return.
One thing worth flagging up front: the certificate can take months to arrive. A company generally can't apply for authority to issue certificates until it has been trading for around four months, or has spent most of the money it raised. So if you invested in January and you're still waiting in the autumn, that's normal, not a red flag.
No certificate, no relief. Everything else is downstream of that.
How do you actually claim the relief?
Most angels claim through their annual Self Assessment return. The relevant box lives on the additional information pages - form SA101 - under "Other tax reliefs". If you file online, it's the equivalent screen in the "Other tax reliefs" section. You enter the total amount you've invested across all your SEIS shares in one figure, and your EIS shares in another.
Then, crucially, you attach the supporting detail. For each holding HMRC wants the name of the company, the amount on which you're claiming, the date of issue, the name of the HMRC office, and the unique investment reference from the certificate. Online, there's an "any other information" box for this; on paper, you list it there too. Keep the certificates themselves - you don't send them in, but HMRC can ask to see them.
SEIS gives you income tax relief worth 50% of what you put in, up to £200,000 of investment per tax year. EIS gives 30%, up to £1,000,000 a year - or up to £2,000,000 if at least half of it goes into knowledge-intensive companies (broadly, R&D-heavy firms that meet HMRC's test). The relief reduces your income tax bill; it isn't a cash handout, and you can't relieve more tax than you actually owe.
If you don't file a tax return
Not everyone is in Self Assessment. If you pay tax only through PAYE and don't normally file, you can still claim - either by asking HMRC to adjust your tax code, or by sending the claim form on the back of the certificate (older EIS3s include a claim form section) to your tax office. Adjusting the code spreads the benefit across your pay packets rather than as a lump sum.
When should you carry the relief back a year?
Both schemes let you treat an investment as though you'd made it in the previous tax year. The relief then comes off that earlier year's income tax instead of the current year's. You request it on the same claim, by entering how much you want carried back.
Two situations make this useful. The first: you had a much bigger income tax bill last year - a bonus, a property sale, a one-off - and you'd rather relieve that. The second: you've already used up this year's annual limit (£200,000 for SEIS, £1m for EIS) and want to park the excess against last year's allowance. Carry-back is one of the genuinely valuable, and genuinely overlooked, features of both schemes. It does not, though, let you claim relief you weren't entitled to - it shifts the year, not the amount.
What about capital gains and losses?
Income tax relief is only half the picture. SEIS and EIS shares come with their own capital gains treatment, and you claim that separately - usually on the capital gains pages of the same return.
- Tax-free growth. If you've held the shares for at least three years and received income tax relief, any gain when you sell is exempt from Capital Gains Tax.
- SEIS reinvestment relief. SEIS can wipe out CGT on 50% of a gain you reinvest into SEIS shares, on up to £100,000 of investment in a tax year.
- EIS deferral relief. EIS lets you defer a capital gain by reinvesting it into EIS shares - the gain comes back into charge later, but the bill is postponed.
- Loss relief. If the company fails, both schemes let you set the loss (net of the income tax relief you already had) against income or gains. It's the safety net that softens the inevitable write-offs in an early-stage portfolio.
The mechanics of each sit in HMRC's helpsheets - HS393 for SEIS and HS297 for EIS - which spell out the boxes line by line. Worth a read before you file, or a forward to your accountant. (HS393, HS297.)
How long have you got - and what trips people up?
The hard deadline is generous: you can claim up to five years after the 31 January following the tax year in which the shares were issued. But generous deadlines breed procrastination, and the real risk isn't the deadline - it's the holding period. SEIS and EIS both require you to hold the shares for at least three years. Sell early, or let the company drift out of qualifying status, and the income tax relief is clawed back, in whole or in part. If that happens you have to tell HMRC, usually via the return, and repay what's no longer due.
The other recurring snag is simply the certificate lag. People file their return, forget the SEIS3 hasn't turned up yet, and miss the claim for that year. You can amend a return, and the five-year window gives you room - but the cleaner path is to wait for the certificate, then file or amend with the reference in hand.
Two more things to keep straight. You generally need to be a UK taxpayer to use any of this - the reliefs work against a UK income tax or CGT bill, so non-taxpayers have nothing to relieve. And none of the above is the same conversation as the company's own eligibility: advance assurance, gross-asset tests, the raise caps. Those are the company's problem before you invest. By the time a certificate lands on your desk, that work is done. Your job is to get the numbers in the right boxes.
Last word, and we mean it: this is general editorial information, not financial or tax advice. The reliefs are valuable but the rules have edges, and a wrong claim is your liability, not the company's. Run it past an accountant or an FCA-regulated adviser before you file.