 Role of Internal Audit Charter: The internal audit charter is a formal document that defines the purpose, authority, and responsibility of the internal audit activity. It establishes the internal audit activity’s position within the organization, including the nature of the chief audit executive’s functional reporting relationship with the board.

 CEO’s Decision Justification: According to IIA guidance, the internal audit activity can take on responsibilities related to risk management and investigation if it is defined within the internal audit charter. The charter must outline the scope of the internal audit activity, which can include risk management functions if approved by the board and senior management.

 Authority and Proficiency: While the CEO has the authority to assign responsibilities, the decision must align with the provisions of the internal audit charter. The level of proficiency of the CAE and the recommendation of external auditors can support the decision but are not primary justifications.

 IIA Standards: Standard 1000 – Purpose, Authority, and Responsibility – requires that the internal audit activity’s purpose, authority, and responsibility be formally defined in an internal audit charter, consistent with the Mission of Internal Audit and the mandatory elements of the International Professional Practices Framework.

 References:

The internal audit charter is the primary document that justifies the scope and responsibilities of the internal audit activity, including risk management and investigation roles. It ensures that such roles are formally acknowledged and authorized by the board and senior management​​​​.