Under Rule 29, the Public Company Accounting Oversight Board (PCAOB) requires principal auditors to disclose the extent of use of other auditors on an audit engagement. This mandatory disclosure occurs on Form AP, available on the PCAOB's website. Principal auditors may voluntarily disclose this same information in an appendix to the audit report. We experimentally examine how the joint effects of the principal auditor's extent of use of other auditors and their use of voluntary disclosure influence investors' perceptions of audit quality. Results indicate that investors perceive audit quality to be lowest when principal auditors use other auditors to a greater extent and only file the mandatory disclosure. We find voluntary disclosure in the audit report attenuates the perceived effect of using other auditors. Additionally, after a restatement, investors place no additional blame or liability on principal auditors that use other auditors to a greater extent or choose voluntary disclosure.

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