Audit Firm Rotation

Long relationships can make auditors comfortable with management, and rotation resets that familiarity. Mandatory rotation forces a company to change firm after a fixed term. The EU sets maximum tenure for public-interest entities, with tendering at set points, and India applies fixed terms to listed and certain large companies. Audit partner rotation, where only the lead partner changes within the same firm, is milder and common worldwide. Supporters point to fresh eyes and less cosiness. Opponents point to cost, lost knowledge and a higher chance of errors in the first years of a new firm. The United States has debated mandatory firm rotation but has not adopted it. Rotation is one of several independence safeguards, alongside limits on non-audit services and audit committee oversight.

A listed water utility has used the same audit firm for 14 years. Under local rules, it runs a tender, and a different firm wins. The outgoing firm hands over its working papers, and the new firm spends its first months learning the systems. In its first audit it challenges an asset-life estimate that the old firm had accepted for years.