What is the purpose of an internal audit charter?

An internal audit charter is a formal document that defines the purpose, authority, and responsibility of the internal audit function within the organization. Its primary purpose is to explain how the internal audit adds value and supports the organization in achieving its objectives.

“The internal audit charter should define the purpose, authority, and responsibility of the internal audit activity, including its role in helping the organization achieve its objectives.”

— ISO/IEC 27001:2022, Clause 9.2; ISO 19011:2018, Clause 5.1; IIA International Standards