The internal audit function is crucial in organizations as it serves as an independent and objective assurance mechanism, ensuring that governance, risk management, and internal control processes are effective. By evaluating and improving these systems, internal audit helps identify inefficiencies, compliance gaps, and potential risks that could jeopardize organizational goals. It also provides senior management and the board of directors with insights and recommendations, enabling informed decision-making. Internal audit, therefore, plays a vital role in safeguarding organizational assets, ensuring accuracy in financial reporting, and promoting adherence to laws and regulations.

In the context of the three lines of defense model, the internal audit function represents the third line, serving as the final checkpoint for risk management. The first line of defense comprises operational management, which owns and manages risks. The second line includes risk management and compliance functions, which monitor and oversee risk practices. Internal audit provides an independent review of the effectiveness of the first two lines, ensuring that risks are appropriately identified, mitigated, and reported. This structure strengthens organizational resilience by embedding a robust system of checks and balances, ensuring accountability across all levels.