Under the US EPA’s TSCA program for existing chemicals, providing insufficient or incomplete data about a business’s product or process can lead to erroneous risk conclusions by EPA and, ultimately, unnecessary and costly risk management measures. Small and midsize enterprises and downstream users of a chemical are particularly vulnerable to these determinations. To avoid this outcome, stakeholders up and down the value chain should be engaged in the TSCA process as early as possible. A review of the types of data needed by EPA was performed to assist the regulated community with identifying and organizing their data to optimize the accuracy of EPA’s risk assessment conclusions on the relevant Conditions of Use.