EPA is extending the comment period for 30 days and is providing notice that EPA has added a supplemental analysis, titled “Supplemental Analysis of Alternative Small Business Size Standard Definitions and their Effect on TSCA User Fee Collection”, to the rulemaking docket for the proposed rule that published in the Federal Register on February 26, 2018. The supplemental analysis provides additional estimates for the impact of setting the small business definition based on an employee-based threshold.