Special audit power permits nomination of chartered or cost accountant to examine records and report, triggering assessment action. An officer not below Assistant Commissioner, with Chief Commissioner approval, may direct a registered person to have records audited by a nominated chartered or cost accountant if declared value or input credit appears incorrect; the nominated accountant must file a signed audit report within ninety days (with one possible ninety day extension). The taxpayer has a right to be heard before material from the special audit is used against them, the Chief Commissioner determines and pays audit expenses, and detection of unpaid or short paid tax or wrongly availed input tax credit may trigger statutory recovery actions.