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What is Medicare IRMAA?

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The Editors of Encyclopaedia Britannica
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The Editors of Encyclopaedia Britannica

Medicare IRMAA is an income-based surcharge that higher-income beneficiaries pay on top of their Part B and Part D premiums. IRMAA stands for income-related monthly adjustment amount. The surcharge is based on your modified adjusted gross income (MAGI) from two years earlier and applies when your income exceeds certain thresholds.