QC 1000 Amended: 5 Things PCAOB Registered Firms Need to Know

Published on11 September 2026

The PCAOB has officially adopted amendments to QC 1000, but the December 15, 2026 effective date remains.

So what changed, and what do PCAOB-registered firms need to know?

In this Qualified Opinions update, Chris Vanover, former PCAOB Director and President of CPAClub, breaks down five key takeaways from the PCAOB’s latest action on QC 1000 and what they mean for firms preparing for implementation.

With the deadline approaching, firms should understand not only what changed, but what still needs to happen before December 15, 2026.

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