S. 45(5A) : Capital gains-Joint development agreement-Constitutional validity-Amendment by Finance Act, 2017providing for taxation of capital gains from Joint development agreements-Amendment valid-Different classes of assesses-Amendment is with effect from 1-4-2018 and not retrospective. [S. 2(47)(v), 45,48, Transfer of Property Act, 1882, S. 53A, Art. 14, 226]