Core Viewpoint - The legal windows for claiming U.S. Treasury stimulus payments issued during the COVID-19 pandemic have closed, affecting both unclaimed benefits and uncashed checks [1][5]. Group 1: Uncashed Checks - If a stimulus check was received but not cashed, the one-year window to negotiate the check has expired, as indicated by the U.S. Treasury [3]. - Expired, lost, or destroyed checks cannot be cashed, but there may be a possibility to request a replacement, although the U.S. Treasury is unlikely to extend the deadline for expired checks [4]. Group 2: Unclaimed Stimulus Money - For those who never claimed their stimulus money, the deadlines for doing so have also passed, with the IRS previously directing individuals to complete the Recovery Rebate Credit section on their tax returns [5]. - Unclaimed funds from expired checks are automatically canceled and returned to the U.S. Treasury, regardless of the circumstances surrounding the unclaimed status [5][6]. Group 3: Tax Filing Deadlines - The deadline for filing the 2020 tax return to claim the first and second stimulus payments is May 17, 2024, while the cutoff for the third stimulus payment on the 2021 tax return was April 15, 2025 [7].