Costs and benefits of auditors' disclosure of critical audit matters: Initial evidence from the United States

In an effort to make audit reports more informative to financial statement users, the Public Company Accounting Oversight Board (PCAOB) requires an expanded audit report in which auditors are required to disclose critical audit matters (CAMs). The new standard (AS 3101) became effective for audits of financial statements of large accelerated filers for fiscal years ending on or after June 30, 2019. Using a sample of annual reports of large accelerated filers with and without CAM disclosures, we examine the costs and benefits of the mandatory disclosure of CAMs in auditors' reports. Our evidence suggests that compared to auditor reports reporting no CAMs, the presence of a single CAM disclosure in the auditor's report provides incremental information to equity investors without a significant increase in audit costs. However, using the benchmark of a single CAM disclosure, multiple CAMs in an auditor's report results in higher audit fees and longer audit delays.