On December 15, 2026, a transformative series of new and amended rules issued by the Public Company Accounting Oversight Board (PCAOB) is scheduled to take effect. It is widely viewed as the most significant overhaul of the regulations governing registered public accounting firms since the Sarbanes-Oxley Act of 2002. Among the most consequential of these reforms is QC 1000, a new rule requiring audit firms to implement risk-based quality control systems, report annually on their effectiveness, and, for the largest firms, establish an independent External Quality Control Function to evaluate whether internal controls are working.
In an article for Reuters, Glenn Agre partner Trevor J. Welch and associate Nathan J. Ades examine how these new documentation and reporting requirements could reshape negligence claims against auditors, potentially giving plaintiffs access to internal evaluations, certified annual reports, and independent reviewer findings that serve as powerful evidence of audit failures.
The Big Four auditing firms have raised significant objections to QC 1000, centered on practical concerns, such as the anticipated costs and burdens of implementation. But it is not hard to imagine that QC 1000’s implications for future litigation fueled the intensity of their objections.
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