Special audit can be directed to verify declared value and input tax credit, potentially triggering assessment proceedings. A senior tax officer may direct a registered person to have records audited by a chartered accountant or cost accountant nominated by the Commissioner where declared value or input tax credit appears incorrect; the nominated auditor must submit a signed report within the prescribed period, subject to extension. The audit applies despite other audits, requires that the registered person be heard before audit-derived material is used against them, and the Commissioner determines and pays audit expenses; detected tax discrepancies may trigger assessment or recovery proceedings.