The Income-Related Monthly Adjustment Amount (IRMAA) is an extra fee added to Medicare Part B and Part D premiums for certain higher-income beneficiaries. It is calculated using income data from tax returns submitted two years earlier. If your income surpasses specific thresholds, you’ll pay more than the standard Medicare premiums. IRMAA applies to those enrolled in both Original ... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets