I have mentioned this new tax-based scheme before, and more details are now emerging before the scheme starts on 6 April 2012.
One novel feature is that the capital gains tax (CGT) payable on the disposal of ANY chargeable asset in the tax year 2012/13 is exempt if you buy shares under SEIS. How that works has now been announced, and to get full CGT exemption you only need to invest the amount of the gain – not the whole proceeds of sale. If, for example, you make a gain of £50,000 in 2012/13 on a sale for £80,000, full CGT exemption is available if you invest at least £50,000. If you reinvested £30,000, the gain left to tax is £20,000.