The Institute of Internal Auditors (IIA) requires that an external review of the internal audit function be performed at least once every five years. These reviews can be performed by an external review team or can be a self-assessment with independent validation by a qualified reviewer. These reviews cover compliance with IIA standards including independence and objectivity, audit planning and coverage, audit documentation and reporting, and staffing.

Additionally, the Mississippi Office of the State Auditor, and the Joint Legislative Committee on Performance Evaluation and Expenditure Review (PEER) may and have in the past conducted agency internal audit performance reviews.