Permanently expands and clarifies the Earned Income Tax Credit (EITC) for people without qualifying children by changing age rules, increasing credit and income limits, and updating inflation adjustments. It also alters how the EITC applies in certain U.S. territories and lets taxpayers elect to use prior‑year earned income when current‑year earned income falls, with that election effective for taxable years beginning after December 31, 2025.