Section 48(5)(a) in The Bengal Agricultural Income-Tax Act, 1944
(a)where the total income of an assessee under [the enactments relating to Indian Income-tax,] [Words substituted by W.B. Act 18 of 1989.] has been computed for the purposes of [those enactments] [Words substituted by W.B. Act 18 of 1989.], that computation shall be accepted as determining the total income under [those enactments] [Words substituted by W.B. Act 18 of 1989.] for the purposes of this Act and if such computation has not been made the total income of an assessee under [those enactments] [Words substituted by W.B. Act 18 of 1989.] shall be computed in the manner prescribed;