The purpose of this study is to examine the audit efficiency and timeliness of Big 4 auditors relative to non-Big 4 auditors, where audit efficiency is defined as the auditor’s ability to conduct an audit more quickly or with fewer resources while still achieving effective outcomes.
The authors use audit report lags (also referred to as audit delay) as a proxy for audit timeliness and efficiency, controlling for audit quality and audit fees (audit input). The authors use a propensity-score matching (PSM) approach to construct a pseudorandom sample in which each non-Big 4 client is matched with a similar Big 4 client based on their characteristics and audit quality, to control for potential endogeneity related to self-selection bias in this setting.
The authors find that non-Big 4 auditors are associated with shorter audit delays than Big 4 auditors. Additional analysis of the matched sample reveals that non-Big 4 auditors charge lower fees than Big 4 auditors do after controlling for the Big 4 premium. These findings do not support the notion that Big 4 auditors conduct audits more efficiently than non-Big 4 auditors do.
These results could be of interest to the management of public firms, audit committees, investors and regulators; provide valuable insights into the performance of audit firms in varying client environments; and contribute to a better understanding of audit timeliness and efficiency.
