The Income-Related Monthly Adjustment Amount (IRMAA) is a surcharge that Medicare beneficiaries with higher incomes may pay on Part B and Part D premiums. It is based on tax return data from two years earlier. When your income exceeds certain thresholds, you will pay higher premiums than the standard rate. These charges apply to both Original Medicare and Medicare Advantage. Below,... https://www.federalpensionadvisors.com/post/2025-irmaa-brackets