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STANDARDS TRACKER |
STANDARDS TRACKER
PCAOB QC 1000: firm quality control standard, amended August 2026
PCAOB's 2025 inspection data shows Part I.A deficiency rates fell to 23% overall and 8% at the Big Four - the sharpest drop in recent years.
PCAOB QC 1000, adopted in 2023 and amended August 2026, requires registered firms to design, implement, and maintain a quality control system covering governance, risk assessment, and monitoring. The standard takes effect December 15, 2026, pending SEC approval. The first Form QC reporting period runs December 15, 2026 through September 30, 2027.
BY THE NUMBERS
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See below EFFECTIVE |
8 SOURCES TRACKED |
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Oct 27 LAST UPDATED |
PCAOB ISSUER |
The PCAOB's staff report on 2025 inspections covered 143 registered firms and portions of 780 public company audits, per CPA Practice Advisor. Inspections primarily covered audits of public companies with fiscal years ending in 2024 that were completed during 2025, the report states.
The aggregate Part I.A deficiency rate - instances where a firm failed to obtain sufficient appropriate evidence to support its opinion - fell to 23% in 2025 from 38% in 2024, per the PCAOB's release. The Big Four rate dropped to 8% from 20%, per CPA Practice Advisor. Non-affiliated firms inspected annually fell from 52% to 18%; those inspected on a triennial cycle fell from 53% to 32%. Non-U.S. global network firms moved in the opposite direction, rising from 24% to 26%.
The PCAOB staff said it has not studied the causes of the improvement, but CFO Dive reports the board cited sustained focus on quality control, accountability, and technology. Firms have also measured partner workloads against capacity limits and sharpened training on revenue recognition, estimates, fraud, and ICFR, the PCAOB said. The Journal of Accountancy notes the 2025 figures are estimates, as some inspections have not been finalized and prior-year figures can change as additional reports are released.
QC 1000 still awaits final SEC approval before its December 15, 2026 effective date. The Form QC filing requirement and the interplay between improving inspection results and firms' QC remediation plans remain items for close teams supporting external auditors to watch heading into year-end.
WHAT TO DO IN THE CLOSE
| Confirm your external auditor has a QC 1000-compliant quality control system documented before Dec. 15, 2026. | |
| Ask your auditor which Part I.A focus areas - revenue, estimates, ICFR - were flagged in their 2025 inspection and what remediation steps were taken. | |
| For ICFR engagements, verify the auditor has sufficient industry expertise assigned; capacity limits are now a monitored QC variable. | |
| Track the SEC approval of QC 1000; without it, the Dec. 15, 2026 effective date and Form QC period do not begin. | |
| Note that 2025 deficiency figures are estimates; request your auditor's final inspection report when published to confirm their specific rate. |
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QUESTIONS THIS ANSWERS
What is a Part I.A deficiency in a PCAOB inspection?
A Part I.A deficiency is logged when the PCAOB concludes a firm failed to obtain sufficient appropriate audit evidence to support its opinion on a company's financial statements or internal control over financial reporting, per the PCAOB's staff report.
What was the Big Four Part I.A deficiency rate in 2025?
The aggregate Part I.A deficiency rate for the Big Four fell to 8% in 2025 from 20% in 2024, per CPA Practice Advisor. Individual firm estimates were not confirmed in listed sources.
When does PCAOB QC 1000 take effect?
QC 1000 is scheduled to take effect December 15, 2026, pending SEC approval. The first Form QC reporting period runs December 15, 2026 through September 30, 2027.
SOURCES
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A living page: it is re-read and updated as coverage arrives; last updated Tuesday October 27. Facts come from the linked sources; confirm against the issuer's own text before relying on it.
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