VCM40100 | Seed Enterprise Investment Scheme (SEIS): SEIS disposal relief: losses
From HM Revenue & Customs · Venture Capital Schemes Manual
TCGA92/S150E (1) and (3)
An investor can claim a loss on the disposal of SEIS shares even if
the Income Tax relief is not withdrawn and
were a gain to accrue instead, that gain would not be a chargeable gain.
Where a loss arises it must be reduced by the amount of any Income Tax relief which remains attributable to the shares sold.