Exemption under section 35AC: approval of specific institutions' projects for tax benefit, subject to cost caps and service conditions. Exemption under section 35AC approves named institutions and specific projects as eligible for tax-deductible expenditure with prescribed maximum approved costs. Several project approvals carry service conditions requiring a portion of patients to receive free treatment, another portion to be charged at cost, and an income tested cap for low income patients; the notification also specifies differing effective periods for listed projects in relation to assessment years.