IRMAA (Income-Related Monthly Adjustment Amount)

IRMAA is a surcharge added to Medicare Part B and Part D premiums for higher-income beneficiaries. It is based on your modified adjusted gross income from two years prior and can significantly increase your monthly Medicare costs. IRMAA affects individuals with MAGI above $106,000 (single) or $212,000 (married filing jointly) for 2025.

The Income-Related Monthly Adjustment Amount (IRMAA) is an additional charge on top of the standard Medicare Part B and Part D premiums for beneficiaries with higher incomes. IRMAA is determined by the Social Security Administration based on your modified adjusted gross income (MAGI) from your tax return filed two years prior. For example, your 2025 IRMAA is based on your 2023 tax return.

IRMAA applies at several income tiers above the base threshold. For 2025, single filers with MAGI above $106,000 and married couples filing jointly above $212,000 begin paying IRMAA surcharges. The surcharges increase at higher income levels, with the highest tier applying to individuals earning above $500,000 (single) or $750,000 (married filing jointly). At the highest level, the total Part B premium can be more than three times the standard premium.

One of the most important aspects of IRMAA to understand is the two-year look-back period. Income events in a given year — such as a large Roth conversion, the sale of a business, or capital gains from selling appreciated assets — may not trigger IRMAA consequences until two years later. This delay can make IRMAA planning both challenging and valuable.

If you experience a qualifying life-changing event that significantly reduced your income, such as retirement, divorce, or death of a spouse, you may be able to file Form SSA-44 to request that a more recent year's income be used for the IRMAA determination instead of the standard two-year look-back. This can be an important tool for newly retired individuals whose income has dropped substantially.

IRMAA is sometimes described as a "cliff" because crossing an income threshold by even one dollar can trigger the higher premium for the entire year. However, the thresholds are income brackets (not true cliffs at the first level for most situations), and understanding where you fall relative to these thresholds may help you make more informed decisions about the timing and amount of income-generating events.

Why This Matters

IRMAA can add thousands of dollars annually to your Medicare costs, and because it is based on income from two years ago, it requires proactive planning. Managing your MAGI — through strategies like Roth conversions, QCDs, or timing of capital gains — may help you avoid or minimize these surcharges.

Have questions about IRMAA (Income-Related Monthly Adjustment Amount)?

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