Updated July 31, 2026. Quick answer: IRMAA is the surcharge added to Medicare premiums for higher incomes, and it behaves unlike almost anything else in the tax code: it is a cliff, not a slope. One dollar of income over a threshold moves you into a whole bracket and costs the full step, for both spouses, for a year. It is also assessed on a return from two years earlier, which means the income that sets your premium was earned before you were paying attention to it – and which makes any large one-off event, a Roth conversion or a property sale, a decision with a delayed price. When circumstances have genuinely changed, the fix is usually a new initial determination rather than an appeal, and the two are different forms with different odds.
How the surcharge works
- IRMAA Brackets & Surcharges
- IRMAA Is a Cliff. One Dollar Moves a Whole Bracket.
- IRMAA MAGI Is Not ACA MAGI (or Roth MAGI)
- IRMAA Uses a Two-Year-Old Return. Usually.
What triggers it, and what does not qualify for relief
- You Probably Want a New Determination, Not an Appeal
- Filing Separately Can Leave You With Only Two IRMAA Brackets
- A Roth Conversion Is Not an IRMAA Life-Changing Event
- Selling a Business Does Not Qualify for IRMAA Relief
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