IRMAA stands for Income-Related Monthly Adjustment Amount, an extra premium charged to higher-income Medicare beneficiaries. It's based on the income reported on your tax return from two years before the current year. If your income is above Medicare’s thresholds, you’ll pay more than the standard premium for Part B and Part D. This applies whether you have Original Medicare or a M... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets