Tax exemption for Gujarat Water Supply and Sewerage Board under section 10(46) covers specified income subject to conditions. Central Government notifies Gujarat Water Supply and Sewerage Board under clause (46) of section 10 to exempt specified income: grants from Government, local bodies and other agencies; deposits from local bodies; centage at State-prescribed rates; water charges at State-fixed tariffs; rent under the Gujarat Water Supply and Sewerage Act, 1978; and interest on these receipts. The exemption is conditional on no commercial activity, unchanged activities and income nature, and prescribed return filing; it applies to specified past and future assessment years noted in the notification.