Staffing Leverage at the Audit Office and Audit Quality

ABSTRACT The PCAOB posits that audit partner and manager involvement, primarily through greater supervision and review (“oversight”) of audit engagements, is an important determinant and indicator of audit quality. We test this notion by empirically examining the link between staffing leverage, as measured by an office's ratio of audit partners and managers to audit employees, and audit outcomes from 2008 to 2022. We find staffing leverage is associated with lower rates of client misstatements, comment letters, and PCAOB inspection deficiencies, suggesting higher audit quality. When disaggregated, the association pertains to both partners and nonpartner managers. This relation is stronger for more complex clients and for offices with better management. We also find that staffing leverage measured at the firm level predicts audit quality, and that both office‐ and firm‐level staffing leverage are incrementally informative of audit quality, suggesting disclosing audit oversight metrics at multiple levels could be beneficial. However, the association between firm‐level staffing leverage and audit quality is statistically detected only within Big 4 audits. These findings suggest that audit committees, investors, and regulators can use audit‐office partner‐staffing and manager‐staffing leverage as an informative indicator of audit quality, particularly for complex engagements.