Income-tax exemption under section 10(23C) amended to change the referenced assessment year from 1976-77 to 1974-75. The Central Government, under clause (v) of sub-section (23C) of section 10 of the Income-tax Act, amends Notification No.1477 (13-9-76) by substituting the words 'assessment year(s) 1976-77' with 'assessment year(s) 1974-75' through Notification No.2590 dated 28-1-1977, effecting a change in the temporal reference for the exemption provision.