EPA is extending the compliance dates for the formaldehyde emission standards for composite wood products final rule issued pursuant to the Toxic Substances Control Act (TSCA) Title VI, and published in the Federal Register on December 12, 2016. EPA is extending the December 12, 2017, manufactured-by date for emission standards, recordkeeping, and labeling provisions until December 12, 2018; extending the December 12, 2018 compliance date for import certification provisions until March 22, 2019; and extending the December 12, 2023, compliance date for provisions applicable to producers of laminated products until March 22, 2024. Additionally, this final rule will extend the transitional period during which the California Air Resources Board (CARB) Third Party Certifiers (TPC) may certify composite wood products under TSCA Title VI without an accreditation issued by an EPA TSCA Title VI Accreditation Body, so long as the TPC remains approved by CARB, is recognized by EPA, and complies with all aspects of the December 12, 2016 final rule until March 22, 2019. EPA believes that extension of these compliance dates and the transitional period for CARB TPCs adds needed regulatory flexibility for regulated entities, reduces compliance burdens, and helps to prevent disruptions to supply chains while still ensuring that compliant composite wood products enter the supply chain in a timely manner.