As codified, the responsibilities of the OIG include:

• Initiating and conducting independent fiscal and management audits, inspections, and investigations of District government operations.
• Serving as the principal liaison between the District government and the US Government Accountability Office.
• Conducting other special audits, assignments, and investigations.
• Annually conducting a performance audit of procurement activities of the District government.
• Forwarding to the appropriate authorities evidence of criminal wrongdoing that is discovered as the result of any audit, inspection, or investigation conducted by the Office.
• Entering into a contract with an outside auditor to perform the Comprehensive Annual Financial Report (CAFR) of the District government for the fiscal year.