We examine how internal control effectiveness influences the audit completeness of earnings announcements and the consequences on earnings reliability. One of the intentions of the Sarbanes Oxley Act of 2002 (SOX) was for internal controls to improve financial reporting. While we show that effective internal controls directly reduce earnings announcement revisions as SOX would intend, we also find evidence that it provides management with the confidence to release their earnings disclosure earlier (with a less complete audit), indirectly increasing the likelihood of earnings announcement revisions. As a result, the beneficial impact of internal control effectiveness on earnings reliability is significantly undermined in a regulatory environment where companies are permitted to disclose preliminary earnings to the public. Our study provides important insights for regulatory policymaking and for accounting practitioners who are responsible for producing reliable financial disclosure.

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