Exemption notification under section 10(46): specified incomes of Hyderabad Metropolitan Water Supply and Sewerage Board exempted subject to conditions. Notification under clause (46) of section 10 exempts specified incomes of Hyderabad Metropolitan Water Supply and Sewerage Board, namely state grants, water and sewerage cess, connection charges, interest and penalties on delayed water cess, tanker supply receipts, tender form sales, centage income, rental receipts, and interest on deposits, subject to conditions that the board not engage in commercial activity, the nature of activities and incomes remain unchanged, and the board files returns as per clause (g) of section 139(4C); retrospectively effective for earlier assessment years and applicable to subsequent listed assessment years.