The Public Company Accounting Oversight Board (PCAOB), in its October 2025 Data Point: Financial Restatements and Auditor Turnover, establishes a notable association between auditor change and the incidence of financial restatements. Over the 2005–2024 period, “Big R” restatements affected approximately 3% of public companies annually. However, among firms that reported such restatements, 29% had changed auditors in the prior year, compared with an average annual auditor-change rate of just 11% across the broader population.

This differential is significant. It suggests that companies undergoing auditor transitions are disproportionately more likely to experience material misstatements in their financial reporting. The PCAOB’s analysis does not prescribe causation, but the correlation warrants closer attention from boards, investors, regulators, and assurance professionals.

Possible reasons for the observed relationship

The link between auditor change and restatements can be explained by several interrelated factors:

• Renewed scrutiny – Successor auditors often reassess prior judgments, accounting estimates, and controls, leading to the identification of misstatements previously uncorrected.
• Knowledge transfer gaps – Transitions can disrupt continuity, with incomplete handover of insights from the outgoing auditor resulting in issues emerging later.
• Pre-existing disputes – Auditor turnover may stem from disagreements on technical accounting treatments. A new auditor may resolve these disputes through restatement.
• Governance and fee pressures – Audit changes driven by cost considerations or governance dynamics may introduce transition risk, heightening the chance of reporting adjustments.

Challenges identified

The PCAOB’s findings highlight several challenges that accompany auditor changes:

• Audit committees face heightened governance responsibility in overseeing transitions and ensuring adequate continuity of audit knowledge.
• Companies risk diminished market confidence when a restatement follows shortly after an auditor change, as investors may interpret it as evidence of instability.
• Auditors must manage first-year risk carefully, as the likelihood of restatement is demonstrably higher in new engagements.
• Regulatory attention intensifies when auditor turnover and restatements coincide, increasing scrutiny on both company management and the incoming audit firm.

Implications for practice

The evidence presented by the PCAOB suggests that auditor change should be approached as more than an administrative or contractual decision. It is a governance event with measurable implications for financial reporting reliability.

• Audit committees should strengthen due diligence when approving auditor changes, focusing not only on independence and cost, but also on transition risks.
• Incoming auditors should apply heightened skepticism and invest additional resources in the first year of engagement to validate opening balances and historical judgments.
• Regulators and investors should recognize that the presence of an auditor change increases the likelihood of a subsequent restatement, and interpret such developments in context.

KNAV Comments

The PCAOB’s 2025 report makes clear that auditor turnover and financial restatements are linked in a way that cannot be ignored. While turnover may at times reflect healthy governance practices, it is also associated with elevated reporting risk. The evidence suggests that when an auditor change occurs, stakeholders must prepare for the possibility of restatements, and manage the transition with deliberate rigor.

Auditor change, therefore, should be treated as a critical inflection point in the assurance process—a moment where the risk of misstatement is heightened, and where strong governance and professional skepticism are most needed to preserve trust in financial reporting.