Capital gain exemption for listed securities reinvested in eligible public issue within six months; sale within one year triggers taxation. Capital gain from transfer of long term listed securities or units is exempted in whole or in proportion where the capital gain is invested within six months in equity shares of an eligible public issue by an Indian public company; if those specified equity shares are transferred within one year, the previously exempted amount is deemed taxable, and the cost taken into account for exemption is subject to later limits on related deductions.