CENVAT credit recovery where insurers used input credit for exempt investment services, prompting audits and verification of tax basis. Life insurance companies availed extensive CENVAT credit while providing both taxable and exempt services; under Rule 6 they were required to maintain separate accounts or make prescribed reversals where inputs served exempt services. Many insurers appear not to have complied with these adjustment obligations, having utilised full credit; the Department requires verification of tax computation basis, recovery of credit used for exempt services, and expedited audit and adjudication of pending cases.