Income exemption for St. John Ambulance receipts applies where institution meets specified compliance, reporting and audit conditions. Any income received by any person on behalf of St. John Ambulance is exempt under Section 10(23C)(iv) subject to conditions: income must be applied or properly accumulated for institutional objects with limited accumulation; investments restricted to forms specified in section 11(5); business income exempt only if incidental with separate books; regular filing of returns; audited accounts and prescribed audit report; on dissolution surplus and assets to a similar organization. The notification applies to recipients of such income from Assessment Year 2004-05 and is liable to rescission for noncompliance.