IRMAA Check

Roth Conversion and IRMAA

Quick answer: Roth conversions can increase Medicare MAGI because the taxable conversion amount is usually included in AGI for the year converted.

A conversion can be a smart tax move and still create a Medicare premium surprise. The danger is usually not the conversion itself. It is doing the conversion without checking the IRMAA bracket room first.

Estimate Roth conversion IRMAA impact
Retirement account paperwork used to plan a Roth conversion and Medicare premium impact

Why a Roth conversion can trigger IRMAA

A taxable Roth conversion is generally included in federal AGI. Medicare MAGI usually starts with AGI, then adds tax-exempt interest. If the conversion pushes that total over an IRMAA threshold, future Medicare Part B and Part D premiums can rise.

For 2026 premiums, Medicare generally uses 2024 income. That two-year lookback is why a conversion done before Medicare can still matter later.

Planning move: Estimate your baseline MAGI first, then test only the extra conversion amount. The useful number is often the room before the next IRMAA bracket.

How to size a conversion around IRMAA

  1. Start with expected Medicare MAGI before the conversion.
  2. Add the taxable conversion amount.
  3. Compare the result with the IRMAA bracket for the Medicare premium year you are planning around.
  4. Decide whether the tax benefit is worth the possible premium cost.

What counts in the conversion year?

The key IRMAA issue is the tax year, not the month when the money moves. If you convert part of a traditional IRA to a Roth IRA in 2026, the taxable conversion belongs in the 2026 tax year. A later Medicare premium year may then use that return under the two-year lookback.

That timing can be useful when you plan intentionally. Some retirees convert during lower-income years before required minimum distributions begin. Others convert only up to the next IRMAA bracket because the extra Medicare premium would outweigh the tax strategy. The right answer depends on taxes, cash flow, investment goals, and whether one or two spouses are enrolled in Medicare.

What to write down before converting

  • Your expected AGI before the conversion.
  • Any tax-exempt interest that must be added for Medicare MAGI.
  • The taxable amount of the conversion, after any basis or nondeductible IRA tracking.
  • The Medicare premium year that may eventually use this tax return.
  • Whether both spouses could pay IRMAA if the household crosses a bracket.

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Can SSA-44 remove IRMAA from a Roth conversion?

Usually not by itself. A voluntary Roth conversion is not normally one of the life-changing events listed on SSA-44. If your income later drops because of retirement, work stoppage, divorce, or another qualifying event, review the SSA-44 rules carefully.

Roth conversion IRMAA FAQ

Does a Roth conversion count toward IRMAA?
Yes. The taxable conversion amount is generally included in AGI, and Medicare MAGI usually starts with AGI plus tax-exempt interest.
What year does a Roth conversion affect IRMAA?
A conversion affects the tax year when the conversion is reported, and Medicare often uses that return two years later for IRMAA.
Can SSA-44 remove IRMAA from a Roth conversion?
Usually not by itself. A voluntary Roth conversion is not normally one of the life-changing events listed on SSA-44.

Official sources

For the federal tax treatment of Roth conversions, review the IRS IRA frequently asked questions. For the Medicare MAGI definition used for IRMAA, review SSA POMS HI 01101.010 and Form SSA-44.

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