PCAOB QC 1000, A Firm's System of Quality Control: September 2026 amendments, and related amendments to AS 2201

Summary

The PCAOB adopted amendments to QC 1000, its standard on audit firms' own quality-control systems, on September 9, 2026. They rescind the requirement for an External QC Function, let firms choose the date of their annual QC evaluation and cut the retention period for QC documentation from seven years to five. The amendments need SEC approval and, if approved, take effect on December 15, 2026, the date already set for QC 1000 itself. The same date applies to the related amendments to AS 2201 adopted in 2024, which include a new paragraph .99 telling the auditor to act under AS 2901 when an engagement deficiency is found after the ICFR report is issued.

Key dates

1. October 20, 2026Checked against sources
2. December 15, 2026Key date

Developments are added when the record is reviewed. Next review: January 12, 2027.

Evidence

Each passage is quoted from its source. The quoted passages are re-checked against the live pages every month.

1. On September 9, 2026, the Board adopted proposed rule amendments to QC 1000, A Firm's System of Quality Control, related amendments to PCAOB Rule 2203A, PCAOB forms, and technical amendments to AS 2101, Audit Planning.

   Supports: PCAOB adopted the QC 1000 amendments on September 9, 2026; SEC published them for comment on September 15, 2026

   If approved by the SEC, the amendments to QC 1000 that the Board adopted and the related amendments to a PCAOB rule and PCAOB forms will also take effect on December 15, 2026.

   Supports: Effective date December 15, 2026 and SEC approval needed for the amendments

   Rescind the requirement to have an External QC Function

   Supports: Content of the amendments: External QC Function rescinded

   Simplify the requirements for retention of QC system documentation and abbreviate the retention period from seven to five years

   Supports: Content of the amendments: retention period seven to five years

   Notice of Filing of Proposed Rules on Amendments to QC 1000 (Release No. 34-106372) U.S. Securities and Exchange Commission Primary source

2. AS 2201, An Audit of Internal Control Over Financial Reporting That Is Integrated with An Audit of Financial Statements; AS 2315, Audit Sampling

   Supports: AS 2201 is among the 2024 standards whose effective date moved to December 15, 2026 (list in the notice)

   Notice of Filing and Immediate Effectiveness of Proposed Rule Change Postponing the Effective Date of Amendments to Board Standards, Rules, and Forms Adopted on May 13, 2024 (Release No. 34-103803) U.S. Securities and Exchange Commission Primary source

3. These include, among other changes, expanding the auditor's responsibility to respond to deficiencies on completed engagements under an amended and retitled AS 2901, Responding to Engagement Deficiencies After Issuance of the Auditor's Report

   Supports: 2024 adopting release describes the related change (AS 2901)

   When the auditor has determined that an engagement deficiency exists, the auditor should take action to address the deficiency in accordance with AS 2901

   Supports: New AS 2201 paragraph .99 (text as adopted in 2024)

   PCAOB Release No. 2024-005 (Appendix 5, Other Amendments) Public Company Accounting Oversight Board (PCAOB) Primary source

4. If approved by the SEC, the amendments to QC 1000 and to the related PCAOB rule and forms will become effective on December 15, 2026.

   Supports: Adoption on September 9, 2026; effective date; SEC approval needed

   PCAOB Adopts Amendments to Its Quality Control Standard (news release, September 9, 2026) Public Company Accounting Oversight Board (PCAOB) Primary source

5. Effective on December 15, 2026. September 9, 2026 Pending

   Supports: Recently completed projects table: Quality Control, Amendments to QC 1000; Board adoption September 9, 2026; SEC approval pending

   Standard-Setting, Research, Rulemaking, and Related Activities (agenda page) Public Company Accounting Oversight Board (PCAOB) Primary source