The 2026 IRMAA brackets could mean higher Medicare premiums for retirees with increasing income levels. These income-based surcharges under IRMAA 2026 apply to Medicare Part B and D and are determined by your 2024 tax return. If your income rises due to pensions, Social Security, or TSP distributions, you may fall into one of the higher IRMAA brackets 2026. Our article helps you under... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets