On April 28, 2023, the Internal Revenue Service (IRS) released a Chief Counsel memorandum reiterating the substantiation requirements included in proposed IRS regulations for health flexible spending arrangements (FSAs) and dependent care flexible spending arrangement (DCFSA). These substantiation rules are longstanding, and there were no changes to the rules in the proposed regulations. However, the memo serves as a reminder to FSA administrators about the importance of proper documentation for expenses claimed through FSAs. Following these rules helps ensure compliance and reduces the risk of audits and penalties.