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PPC and Quickfinder updates

PCAOB postpones effective date of QC 1000

In August 2025, the PCAOB announced a 1-year delay in the effective date for QC 1000,
A Firm’s System of Quality Control
, and other related amendments to PCAOB standards, rules, and forms adopted on May 13, 2024. These requirements will now take effect on December 15, 2026. The Board also deferred the date on which certain existing rules and standards will be rescinded. Please note that as of the date of this communication, the PCAOB has neither revised nor proposed revisions to the text of the new or amended standards, rules, or forms as adopted. The PCAOB's prior position on early adoption has not changed: registered firms may choose to comply with QC 1000 before the effective date. However, firms are not permitted to report to the PCAOB on the evaluation of the quality control system before the effective date.
For more details, refer to the PCAOB press release.
Thomson Reuters Response
  • Thomson Reuters updates PPC’s Guide to PCAOB Audits annually. The 2025 edition of the Guide was completed on May 27, 2025, and no changes have been made to that specific edition of the Guide since then.
  • The engagement-level requirements of QC 1000 have been fully implemented in the 2025 edition of the Guide. The updates primarily involved updating references and terminology from extant guidance to the QC 1000 counterparts and replacing prior “Practical Considerations” with new QC 1000 concepts and requirements.
  • While our materials have been updated to reflect QC 1000 terminology and concepts, the authors believe that, at the engagement level, these changes are generally clarifying in nature, remaining consistent with existing expectations and reflecting good practice. As such, it is the authors’ position that no critical engagement-level steps were removed or altered in a way that would cause them to be incompatible with engagements conducted prior to implementation of QC 1000. A summary of substantive changes made to the 2025 edition of the Guide is available on Checkpoint: List of Substantive Changes - PCAOB Audits (PPC).
What this means for you
  • You can confidently rely on your 2025 edition of the Guide to conduct engagements before and after QC 1000 becomes effective. They are suitable whether your firm elects to implement early or to defer until the new effective date.
  • The 2025 edition of the Guide also incorporates other new standards, amendments, and guidance, such as those in PCAOB Release No. 2024-004, General Responsibilities of the Auditor in Conducting an Audit and Amendments to PCAOB Standards, which are generally effective for audits of financial statements for years beginning on or after December 15, 2024. For this reason, it is always best practice to use the most recent edition of your PPC products.
  • Note that the effective date of the AICPA’s Quality Management Standards isn't expected to change. Thus, firms still need to implement those standards by December 15, 2025. For more information regarding the AICPA’s Quality Management Standards, refer to
    PPC’s Guide to Quality Management
    .
Thank you for your business, and we look forward to continuing to serve you. Please do not hesitate to contact us should you have any questions or concerns.
Thomson Reuters - Tax & Accounting

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