What is IRMAA?
IRMAA — the Income-Related Monthly Adjustment Amount— is an extra amount higher-income retirees pay on top of their standard Medicare Part B and Part D premiums. It isn’t a tax you file; it’s a surcharge Social Security applies automatically based on your income from two years ago.
What you’ll actually pay in 2026
Based on your 2024 modified adjusted gross income (MAGI). The standard Part B premium is $202.90; everything above it is IRMAA.
Part B amounts are the total monthly premium (standard + IRMAA). Part D IRMAA is added on top of your drug plan’s premium. Married-filing-separately thresholds differ. Figures are 2026 amounts (Social Security / CMS) and are subject to annual adjustment — verify before publishing.
Two rules that catch people off guard.
The two-year lookback
Your 2026 premiums are set by your 2024 tax return. A one-time income event — a home sale, a large Roth conversion, an inherited IRA — can raise your premiums two years later, long after the money is spent.
It's a cliff, not a ramp
Cross a threshold by a single dollar and you jump to the next tier's full surcharge — for the entire year. That's why the last few thousand dollars of income before a bracket edge matter so much.
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