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Accountancy Slice
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Big Four audit quality improves sharply as PCAOB considers inspection overhaul

Audit quality among the largest U.S. accounting firms improved significantly in 2025, with the overall deficiency rate falling to 12.5%, about half the level recorded in 2024, according to the PCAOB. EY and Deloitte posted the strongest results, with deficiencies identified in just 5% of inspected audits, while PwC’s rate fell below 10%, and KPMG improved for a third consecutive year to 13%. EY attributed its gains partly to investments in technology, standardized audit methods, AI-backed tools, advanced analytics, and stronger governance. Mid-tier firms continued to lag, although they also improved, with deficiency rates of 34% at BDO and 33% at Grant Thornton. The stronger results come at a time when PCAOB Chair Demetrios Logothetis is planning to redesign the inspection process to place greater emphasis on firms’ internal quality controls, a proposal that investor advocates warn could reduce transparency by subjecting fewer individual audits to regulatory scrutiny.

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