Writing off a dead investment isn't a mood; it's a transaction. An angel writes off a holding by crystallising the loss for tax - either through a disposal at a loss, or, far more commonly, a negligible value claim that treats shares worth next to nothing as if they'd been sold. The hard part isn't admitting the company has died. It's establishing that the value has genuinely gone, and then doing the paperwork that turns a dead line on your portfolio into a real claim against your tax bill.
Angels are oddly bad at this. We'll diligence a £15,000 cheque for a fortnight, then leave the wiped-out holding on the books for three years because nobody wants to be the one to call it. The loss is the loss whether you book it or not. Booking it is the only part you control.
When is an angel investment actually dead?
There's an emotional answer and a tax answer, and they rarely arrive at the same time. The emotional death is the founder's apologetic email, the Slack going quiet, the website that stops loading. The one that matters for your return is narrower: the point at which the shares are worth essentially nothing, and can be shown to be.
Three situations cover most of it:
- Formal insolvency. The company enters administration, a creditors' voluntary liquidation, or is being wound up. Here the death is documented for you - there's an insolvency practitioner, a date, and usually a statement that ordinary shareholders will recover nothing.
- Dissolution or strike-off. The company is removed from the Companies House register and ceases to exist. At that point the shares are extinguished outright.
- The zombie. No insolvency, no strike-off - the company technically exists but has no revenue, no cash, no funding line and no credible path to any of them. This is the most common and the most awkward, because nobody hands you a certificate of death.
The distinction that trips people up: quiet is not dead. A company that's missed plan, burned through a runway and gone silent might still be one bridge round from breathing again. Writing it off too early can mean booking a loss on something that later recovers - rare, but it happens, and it complicates the tax position. The test isn't whether you've run out of patience. It's whether the value has actually evaporated.
Quiet is not dead. The test is whether the value has gone - not whether you have run out of patience.
How do you write off a zombie that hasn't folded?
This is the case the rules are built for, and the one most angels don't know about. If your shares have become of negligible value - worth almost nothing while you still own them - HMRC lets you make a negligible value claim. It treats you as having sold the shares and immediately bought them back at their current, near-zero value. That crystallises a capital loss without any actual sale, so you don't have to wait for the company to be formally wound up before you can do anything with the loss.
You make the claim through your Self Assessment return or by writing to HMRC, and you can specify when you want the deemed disposal to fall - there's some backdating latitude where the shares were already of negligible value earlier. The detail matters and the conditions are specific, so this is one to read against HMRC's guidance on negligible value claims or take to an adviser before you file. What you need to be able to show is the substance: that the value has genuinely gone, not just that the company is having a bad year.
What does the write-off let you claim?
Crystallising the loss is the gateway to relief. On qualifying SEIS or EIS shares, once you've triggered a loss - by disposal or by negligible value claim - you can use loss relief to set the allowable loss against your income or your capital gains.
The figure that matters is the allowable loss, not the cheque you wrote. It's your investment minus any income tax relief you already received: 50% under SEIS, 30% under EIS. Put £20,000 into an EIS company and claim the 30% upfront, and £6,000 came back at the start; the allowable loss on a total wipeout is the £14,000 that was genuinely at risk, which you can then set against income or gains. The full mechanics are worth a read in their own right - SEIS and EIS loss relief: how it cushions a failed investment - but the point here is simply that the write-off is what switches it on.
Two boundaries to keep in view. First, this only works on shares that genuinely qualified and stayed qualified through the minimum holding period - three years for both SEIS and EIS. If the company breached the scheme rules before then, you're in clawback territory, which is a different and less pleasant conversation. Second, the structure matters: loss relief is not available on VCT shares, even though Venture Capital Trusts carry their own 20% income tax relief. If your early-stage exposure runs through a VCT rather than direct SEIS or EIS holdings, the write-off doesn't come with the same cushion. The current rules and figures sit on gov.uk's guidance for investors in venture capital schemes.
How do you actually book the write-off?
Strip away the jargon and it's a short sequence. The order is less important than not skipping any of it.
- Establish that the value has gone. Keep the evidence - the administrator's report, the strike-off notice, board minutes, the last set of accounts, the email confirming no shareholder recovery. For a zombie, you want a defensible record that there's no realistic value left.
- Pick the route. Formal insolvency or dissolution may give you a disposal to point to; a zombie typically calls for a negligible value claim. The two get you to the same place - a crystallised loss - by different doors.
- Find the certificate. The SEIS3 or EIS3 issued when you invested carries the relief figure you'll subtract to size the allowable loss. No certificate, no clean claim.
- Decide where the loss lands. Against income for the year of the loss or the year before, or against capital gains. The better answer depends entirely on your own income and gains in those years - a question for an adviser, not a rule of thumb.
- File it. Through Self Assessment, with the negligible value claim or disposal recorded and the year you want the loss set against specified.
One practical note on what the write-off does and doesn't do to your ownership. A negligible value claim books the loss for tax but you keep the shares - so on the vanishingly rare occasion a written-off company is resurrected, you still hold a stake. If the company is formally dissolved, the shares are extinguished and any residual value passes to the Crown as bona vacantia. The write-off is the tax and accounting event. What happens to the shares themselves depends on what happens to the company.
Why booking it promptly matters
Beyond the obvious - relief in hand sooner - there's a portfolio-hygiene argument. Carrying dead holdings at cost flatters your numbers and distorts how you read your own track record. An angel portfolio is a power-law game: most names go to zero and a handful carry the whole return. Pretending the zeroes are still worth their entry price doesn't change the maths; it delays the moment you see it clearly.
None of which is a reason to rush. Writing off a company that's merely struggling can cost you both the upside and a tidy tax position. The skill is calling the difference between a slow death and a quiet patch - then, once you're sure, not letting the admin drift for years out of squeamishness.
This article is general information for UK angel investors and is editorial journalism, not financial or tax advice. Figures reflect HMRC guidance current at the time of writing; rules and rates change. Check the current position on gov.uk and seek advice from an FCA-regulated or qualified tax adviser before making any investment decision.
Frequently asked questions
When is an angel investment considered dead?
For tax purposes, the trigger is usually a disposal at a loss or the shares becoming of negligible value - worth next to nothing while you still hold them. In practice that means the company has stopped trading, entered administration or liquidation, or is a zombie with no revenue, no funding and no realistic prospect of either. A company being quiet or behind plan is not the same as dead, so the test is whether value has genuinely gone, not whether you have lost patience.
How do you write off shares in a company that has not formally folded?
Where the shares have become of negligible value but the company has not been wound up, HMRC allows a negligible value claim. It treats you as having sold and immediately rebought the shares at their current near-zero value, which crystallises the loss without an actual sale. You make the claim through Self Assessment or by writing to HMRC. The conditions are specific, so check current gov.uk guidance or take advice before filing.
Can you claim SEIS or EIS loss relief when you write off a dead holding?
Yes, if the shares qualified. Once the loss is crystallised by a disposal or a negligible value claim, SEIS and EIS loss relief lets you set the allowable loss - your investment minus any income tax relief already given - against income or capital gains. You will need the SEIS3 or EIS3 certificate and a record of the relief you claimed. Whether to use it against income or gains depends on your own tax position.
Does writing off the investment mean you lose your shares?
Not necessarily. A negligible value claim books the loss for tax while you keep the shares, so if the company somehow recovers you still hold a stake. If the company is formally dissolved, the shares are extinguished and any remaining value normally passes to the Crown as bona vacantia. The write-off is an accounting and tax event; whether you still own anything depends on what happens to the company itself.