EPA issued a supplemental proposed rule modifying and adjusting certain aspects of the fees rule established under the Toxic Substances Control Act (TSCA). EPA is publishing these changes to ensure that collected fees provide the Agency with 25% of authorized TSCA costs consistent with direction in the FY 2022 appropriations bill to consider the "full" implementation costs of the law. Updating TSCA fees will strengthen EPA's ability to successfully implement TSCA in a way that's both protective and sustainable and significantly improve on-time performance and quality.