On November 23, 2021, the revision to Taiwan’s New and Existing Chemical Registration was published and took effect immediately. Compared with the previous draft version released on May 24, 2021 (ChemLinked news), the amendments are remained the same except for two adjustments in the final revision, including extending the deadline for the registration of 106 priority existing chemicals (PECs) to December 31, 2024 and maintain the official review period unchanged to reduce registrants' pressures associated with the time limit and to improve the registration efficiency.