SEIS and EIS: What UK Angel Investors Actually Need to Track

What SEIS and EIS actually give you

A quick recap before the record-keeping detail:

• SEIS (Seed Enterprise Investment Scheme): 50% income tax relief on investments up to £200,000 per year. CGT exemption on disposal after three years. CGT deferral on gains reinvested. Loss relief on failed investments.
• EIS (Enterprise Investment Scheme): 30% income tax relief on investments up to £1,000,000 per year (£2,000,000 for knowledge-intensive companies). CGT exemption after three years. CGT deferral. Loss relief.

The relief is claimed via Self Assessment in the year you invest — but only after HMRC has approved the company and issued the S/EIS3 certificate. That's the first record-keeping trap: you've invested but you can't claim yet, sometimes for 12–18 months.

The S/EIS3 certificate: your most important document

After you invest, the company applies to HMRC for advance assurance and then for formal S/EIS3 approval. They issue you a certificate showing:

• The amount you invested
• The date of the share issue
• The number of shares
• The compliance certificate reference number

You need this certificate to claim relief. Without it, HMRC won't process your claim. Keep it permanently — you may need it at disposal years later to prove the three-year qualifying period.

Common problem: Companies delay applying for approval, fail to apply at all, or issue shares in a way that inadvertently disqualifies them. If the certificate never arrives, your investment is likely not qualifying. Chase the company if it's been more than six months.

What to record at the point of investment

When you make the investment, record:

• Company name and Companies House number — essential for identifying the investment in future tax returns
• Date of share issue — this is the date from which the three-year qualifying period runs, not the date you transferred the money
• Amount invested — in GBP, even if you invested via a nominee or fund
• Number of shares and share class
• Scheme type: SEIS or EIS — do not assume; confirm with the company
• Whether you received the S/EIS3: pending or received
• Income tax relief claimed: amount and tax year of the claim

If you invest via a nominee service (common in syndicates), the legal owner of the shares is the nominee. Make sure you have documentation showing your beneficial interest — you still qualify for relief, but the paper trail matters.

The three-year qualifying period

This is the central rule for CGT exemption: you must hold the shares for at least three years from the date of issue. If you sell within three years:

• The CGT exemption is lost — any gain is taxable in the normal way
• HMRC can claw back the income tax relief you already claimed
• You must notify HMRC of any "disqualifying event" — they won't always find out automatically

Track the share issue date carefully. It is not always the same as the date you signed the investment agreement. If your investee company does multiple closings, different batches of shares may have different issue dates — meaning different three-year clocks.

Follow-on investments: each round is separate

If you follow on in a later funding round, that investment is a separate S/EIS position with its own:

• Issue date (and three-year clock)
• S/EIS3 certificate (the company must apply again for each round)
• Cost basis for CGT purposes
• Income tax relief claim

This is where most angels' records break down. They know they've invested "£30k in Startup X" but can't tell HMRC which tranche was which — critical if only one tranche qualifies, or if you sell part of your holding.

Disposal: the CGT calculation

If you sell qualifying SEIS/EIS shares after three years and make a gain, that gain is exempt from CGT — no calculation required, no SA108 entry needed for that disposal.

If you make a loss on disposal (which happens more often than angels like to admit), you can elect for loss relief. The mechanism:

1. Your CGT loss is calculated in the normal way (disposal proceeds minus cost basis)
2. You deduct the income tax relief you claimed: if you invested £20k SEIS and claimed £10k income tax relief, your effective cost base for loss relief is reduced to £10k
3. You can set the resulting loss against income (not just capital gains) — potentially at 45% if you're a higher rate taxpayer

To claim loss relief you need to know exactly how much income tax relief you claimed on each investment. Which brings you back to records.

CGT deferral: an often-missed benefit

If you've realised a capital gain on anything else — shares sold, property disposed of — you can defer that gain by reinvesting it into EIS (not SEIS). The deferred gain becomes payable when you dispose of the EIS shares, or if they stop qualifying. This is worth modelling, especially in a year when you've had a large realisation.

Track deferred gains as a note against the EIS investment. When you eventually sell, you'll need to know exactly what gain was deferred and when.

What a proper tracking system looks like

At minimum, for each SEIS or EIS investment you should be able to answer:

• What is the share issue date? (Not the investment date — the share issue date.)
• Have I received the S/EIS3? If not, when did the company say to expect it?
• How much income tax relief have I claimed, and in which tax year?
• Is the three-year qualifying period complete?
• Have I made any follow-on investments with different issue dates?
• Is there a deferred CGT gain attached to this investment?

A spreadsheet can technically hold this information. The problem is that it doesn't connect to your portfolio tracker — so your SEIS investments either don't appear in your net worth calculation, or they appear without the tax context that gives them meaning.

The common mistakes

• Claiming relief before the S/EIS3 arrives. You can't. Wait for the certificate.
• Using the investment date as the issue date. If you used a nominee structure or there was a delay between payment and share issue, these may differ by weeks or months. The qualifying period runs from issue, not payment.
• Not notifying HMRC of disqualifying events. If the company does something that causes loss of SEIS/EIS status (e.g., carries out a non-qualifying trade), you must notify HMRC within 60 days. Failure to do so can result in penalties.
• Losing the S/EIS3 certificate. If you can't find it at disposal, contact the company — they should have a copy of what they submitted to HMRC.
• Mixing SEIS and EIS investments in the same portfolio view. The reliefs have different rates and rules. They need to be tracked separately.

The bottom line

SEIS and EIS are among the most valuable reliefs available to UK investors. But the relief is not automatic — it requires certificates, timely claims, and ongoing records that survive the holding period. For early-stage investments where the average hold is five to ten years, that's a long time to keep track of the right paperwork.

The investors who lose out on these reliefs are rarely those who made bad investment decisions. They're the ones who couldn't reconstruct the history when it mattered.