IRMAA, or the Income-Related Monthly Adjustment Amount, is an extra charge for higher-income Medicare beneficiaries that affects Part B and Part D premiums. The surcharge is based on your income reported on tax returns filed two years earlier. Those earning above certain income thresholds pay more than standard Medicare premiums. This adjustment applies to both Original Medicare an... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets