The 2026 IRMAA brackets are determined based on a two-year lookback period, meaning the Social Security Administration (SSA) will use your 2024 Modified Adjusted Gross Income (MAGI) to calculate your Medicare Part B and Part D premiums. The IRMAA brackets 2026 are adjusted annually, often increasing due to inflation. Understanding how these brackets are calculated can help retirees pr... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets