Capital gain exemption on reinvestment in qualifying company shares; relief tied to timely use of proceeds for new plant and recapture rules apply. Section 54GB grants exemption from capital gains tax where an individual or HUF invests net consideration from sale of a long-term residential property in equity of a qualifying newly incorporated company and the company utilises those funds within one year to purchase specified new plant and machinery; the exemption is proportionate to the cost of the new asset relative to net consideration, unutilised sums must be deposited in a notified account and treated as cost for exemption, failure to apply deposited funds triggers recapture of the excess exemption, and disposal of the company shares or new asset within the prescribed holding period causes previously exempted gains to become chargeable.