Eligible projects under section 35AC notified: institutions approved with specified project costs and deductible limits for set financial years. The Central Government notifies specified institutions and approves their projects as eligible under section 35AC, listing each project's estimated cost, any corpus fund component, and the maximum amount allowable as a deduction for the stated multi-year approval periods, with individual projects assigned two- or three-year windows during which contributions qualify for the prescribed deduction treatment.