Income exemption for receipts on behalf of a public authority subject to application, investment and reporting conditions for specified years. Notification under Section 10(23C)(iv) exempts income received by any person on behalf of the National Highways Authority of India for assessment years 2002-03 to 2004-05, subject to conditions: the Institution must apply or accumulate income exclusively for its objects with a cap on accumulations exceeding fifteen percent and a five-year maximum retention; investments must be limited to modes specified in section 11(5); business receipts are excluded unless incidental and separately maintained; returns must be regularly filed; and on dissolution surplus assets must transfer to a like organization. The exemption applies only to recipients and not to the Institution's own taxability.