For an early-stage UK company raising from individuals, SEIS and EIS are not a nice-to-have on top of the pitch. They are frequently the reason the cheque exists at all. An angel putting in £50,000 under SEIS gets 50% income tax relief, and downside protection on top of that. Take the relief away and the same person is being asked to make a very different bet.
Founders reliably underestimate two things. The first is how much of the work happens before the round: HMRC will not entertain a speculative application, so you need named prospective investors and a share structure that already works. The second is how much happens after it, when the money is in and attention has moved on — and your investors are waiting on a certificate they cannot claim without.
And the errors here are unusually unforgiving. Most tax mistakes cost money. A share issue done in the wrong order costs your earliest backers a relief you promised them, and there is no amending it later.








