Medicare premiums aren’t flat-rate for everyone. If your income crosses certain thresholds, you pay a surcharge called IRMAA on top of standard Part B and Part D premiums — and the income that triggers it comes largely from the retirement-income decisions covered elsewhere in this section.
How IRMAA Is Actually Calculated
IRMAA for 2026 is based on your Modified Adjusted Gross Income from your 2024 tax return — a two-year lookback that catches people off guard, since a high-income year long past retirement planning can still trigger a surcharge years later. The 2026 surcharge applies to individual filers with income above $109,000 and joint filers above $218,000.
What It Actually Costs
The standard Part B premium for 2026 is $202.90/month. Cross into IRMAA territory and the surcharge on top of that standard premium ranges from $81.20 to $487.00/month, depending on which of five income brackets you land in. Part D carries its own surcharge, ranging from $14.50 to $91.00/month. The brackets top out at $500,000 (individual) and $750,000 (joint), and the first four brackets adjust for inflation each year while the top bracket stays frozen until 2028.
Why Retirement Account Decisions Feed Directly Into This
IRMAA is one of the most concrete real costs of the RMD problem described in our Required Minimum Distributions guide: a large Traditional account balance forces taxable withdrawals at 73+ regardless of need, and that additional taxable income can push you into a higher IRMAA bracket two years later. The same applies to a large one-time Roth conversion, or the year you take a pension lump sum as taxable income — any of these can spike your MAGI in a single year and trigger a higher Medicare premium bracket for the following year, even if your ongoing income afterward is much lower.
The One Real Escape Route: Life-Changing Events
IRMAA determinations can be appealed through Form SSA-44 if you’ve had a qualifying life-changing event — retirement itself, divorce, or the death of a spouse among them — since the standard two-year lookback assumes your income situation hasn’t changed, which it often has by the time the surcharge actually applies. Someone who worked a high-income final year and then fully retired is a textbook case for this appeal, and it’s underused simply because people don’t know it exists.
The Bottom Line
Model your MAGI two years before any year you’ll be on Medicare, factoring in RMDs, Roth conversions, and any lump-sum income events. A single large-income year in your early retirement can quietly cost thousands in Medicare surcharges two years later — and if a life-changing event legitimately lowered your income since then, file the SSA-44 appeal rather than paying a surcharge based on stale numbers.
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