The PROMISE Act of 2026 establishes a mandatory process for Congress to address Social Security's long-term solvency by requiring the Social Security Advisory Board to develop recommendations and legislative language to ensure both the Old-Age and Survivors Insurance Trust Fund and the Disability Insurance Trust Fund can pay full benefits for at least 50 years. The bill affects all Americans who rely on or will rely on Social Security benefits, as it aims to prevent a funding shortfall that would otherwise force automatic benefit reductions. The Advisory Board must submit its report to Congress by September 14, 2026, after holding public listening sessions and gathering stakeholder input. Congress then faces a tightly controlled legislative process with specific deadlines, including committee consideration by November 9, 2026, and floor votes by December 18, 2026, where any proposed solution must achieve long-term solvency and require supermajority approval in the Senate (three-fifths) or majority approval in the House. The legislation includes a decennial review mechanism requiring Congress to revisit Social Security solvency every ten years starting in 2037 if the Trust Funds fall short of the 50-year funding requirement.