What happens to SEIS relief if my startup fails?
By SuLe · Updated 4 May 2026
If a SEIS-backed startup fails, investors normally keep their 50% income tax relief and can claim loss relief on the remainder, set against income tax or capital gains tax at their marginal rate. On a total loss that combination typically recovers well over half of the original investment — provided the company completed its SEIS paperwork while it still could.
Key facts
- SEIS income tax relief is 50% of the amount invested, up to £200,000 per investor per tax year.
- If shares are sold at a loss or the company fails, the loss net of relief can be set against income tax or CGT.
- The 3-year holding period governs early sales — selling within it withdraws income tax relief; failure is not a sale.
- Investors claim with a SEIS3 certificate, which only exists once the company has filed its SEIS1 compliance statement.
- The SEIS1 can be submitted after 4 months of trading, or once 70% of the money raised has been spent.
Do investors lose their 50% relief when the company fails?
Normally, no. The loss-relief rules assume the income tax relief stays in place: the allowable loss is calculated net of the relief already given, which only makes sense if the investor keeps it.
One caution belongs here. Ceasing the qualifying trade within three years of the issue is one of HMRC's withdrawal triggers, and that is aimed at companies that stop trading by choice — a genuine commercial collapse is the situation loss relief exists for. If you are thinking of winding up a solvent company early, take advice before you act.
Either way, nobody gets their capital back. SEIS money is full-risk equity, and the schemes prohibit capital-protection arrangements precisely so that the downside is real.
How does SEIS loss relief work?
Loss relief is a second layer of relief on the money that was genuinely lost. The allowable loss is the amount invested minus the income tax relief already received, and the investor can set it against income tax or capital gains tax.
Its cash value depends on the investor's marginal rate — the tax rate on their top slice of income — so higher earners recover more, through the same mechanics.
It is a claim, not an automatic credit: the investor (usually via an accountant) makes it to HMRC once the shares are worthless or the company is wound up.
What does a total failure cost an investor?
Far less than the headline amount — that is the design. Here is the shape of a total loss on a £10,000 SEIS investment:
| Step on a £10,000 SEIS investment | Amount |
|---|---|
| Income tax relief claimed at 50% | £5,000 |
| Capital genuinely at risk | £5,000 |
| Company fails — allowable loss (net of relief) | £5,000 |
| Loss relief | £5,000 × the investor's marginal income tax rate |
| Worst-case cash loss | £5,000 minus the loss relief |
Whatever the marginal rate, recovery lands above the 50% floor set by the upfront relief — which is why angels treat SEIS cheques as having a partly insured downside, and care about your paperwork.
What paperwork must exist before anyone can claim?
A SEIS3 certificate — and the chain that produces one must be complete before the company dies. The company files its SEIS1 compliance statement with HMRC, which it can only do after 4 months of trading or once 70% of the money raised has been spent; HMRC then authorises the company to issue SEIS3 certificates to investors.
A startup that collapses before either gate opens leaves its investors with no SEIS3, no income tax relief and a much worse loss position. If failure is on the horizon, filing the SEIS1 while you still can is one of the most valuable things a founder can do for their backers.
Keep the records that prove trading dates and spending, because the claim rests on them.
Does the three-year rule change anything?
The 3-year holding period is about disposals and status, not failure. Selling the shares within three years withdraws the income tax relief; the CGT exemption on a profitable exit likewise needs three years plus relief that was given and not withdrawn.
The loss-relief rule is framed differently — it applies where shares are sold at a loss or the company fails, with no minimum holding period attached in HMRC's investor guidance.
A failure in year two is no worse for investors than one in year four. What hurts them is avoidable: missing paperwork, or value flowing back to investors during the collapse.
Worked example
Fiona invests £20,000 in the SEIS round of Verdana Grid Ltd, a climate-tech startup, and claims £10,000 of income tax relief — 50%. Two years later Verdana enters insolvent liquidation and the shares are worthless.
Her allowable loss is £10,000: the £20,000 subscribed, net of the £10,000 relief she keeps. She sets the loss against her income; if her marginal income tax rate were 45% — purely illustrative, use your own rate — the loss relief is worth a further £4,500.
In total she recovers £14,500 of £20,000, so the genuine downside was £5,500 — roughly 28p in the pound. The arithmetic only worked because Verdana had filed its SEIS1 and issued SEIS3 certificates while it still could.
Where founders go wrong
Winding up before the SEIS1 could ever be filed
— no SEIS1 means no SEIS3, and investors lose both reliefs on top of their money.Quoting investors a precise recovery figure
— loss relief depends on each investor's marginal rate; describe the mechanism, not a promised percentage.Returning cash to investors during a wind-down
— repaying share capital or investors receiving value within three years are withdrawal triggers.Confusing failure with an early sale
— selling within three years withdraws the income tax relief; a genuine failure does not work that way.
Related questions
Do SEIS investors get their money back if the company fails?
No — SEIS money is equity, fully at risk, and there is no refund. What investors get is a cushion: the 50% income tax relief they claimed stays in place, and the remaining loss can be set against their income tax or capital gains tax.
What if the company fails before filing its SEIS1?
Then investors may never be able to claim at all. The SEIS1 compliance statement can only be submitted after 4 months of trading or once 70% of the money is spent, and without it HMRC will not authorise the SEIS3 certificates investors claim with. [More: What are SEIS1 and SEIS3 forms?]
Does EIS loss relief work the same way?
Structurally, yes. EIS gives 30% income tax relief upfront rather than 50%, and if the shares are sold at a loss or the company fails, the loss net of that relief can be set against income tax or capital gains tax in the same way. [More: What is EIS and how does it work?]
Can I wind the company up early to hand investors their loss relief?
Be careful. Ceasing the qualifying trade within three years of the share issue is one of HMRC's status-loss triggers, and a deliberate early wind-up is not the same as a genuine commercial failure. Take advice before closing a SEIS-funded company voluntarily. [More: Can my company lose SEIS/EIS status after the investment?]
How a SEIS company fails matters almost as much as whether it does — file the right forms in the right order and your investors keep most of their downside protection; skip them and they lose everything twice. A SuLe solicitor can check your SEIS paperwork now, and guide a wind-down that protects your backers if it comes to that. Book a free SEIS/EIS readiness call before you need it.
Keep reading: What is SEIS and how does it work? · What is the risk-to-capital condition? · Can my company lose SEIS/EIS status after the investment? · What are SEIS1 and SEIS3 forms? · How do I shut down a startup properly (strike-off vs liquidation)?
Primary sources: HMRC — Tax relief for investors using venture capital schemes · HMRC — Apply to use the Seed Enterprise Investment Scheme
