The 2025 IRMAA brackets determine the additional Medicare Part B and Part D premiums for higher-income beneficiaries. These brackets are based on Modified Adjusted Gross Income (MAGI) from 2023 tax returns. In 2025, the standard Medicare Part B premium is set at $185, but those exceeding certain income thresholds will pay higher amounts. The lowest surcharge begins at $259 for individ... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets