Understanding the Impact of Roth IRA Conversions on Medicare Premiums

A retiree faced unexpected Medicare premium increases after converting $120,000 from a traditional IRA to a Roth IRA at age 63—highlighting the importance of considering Income-Related Monthly Adjustment Amounts (IRMAA) impacts in financial planning.

Bob, a retiree, was initially advised by his CPA that converting his IRA before required minimum distributions would be advantageous. However, the move resulted in higher Medicare premiums due to IRMAA, which calculated a two-year lookback on his 2024 tax return. As a result, Bob's Medicare Part B and Part D premiums increased, underscoring potential financial implications for retirees making similar decisions.

Understanding IRMAA and Its Impact

In 2026, Medicare set the standard monthly premium for Part B at $202.90 for those with a modified adjusted gross income (MAGI) of $109,000 or below. Bob's MAGI in 2024, including a mix of pension, interest, part-time consulting income, and the Roth conversion, reached $160,000, placing him in the second IRMAA tier. This resulted in nearly $2,900 in annual surcharges added to his Medicare premiums for 2026.

The IRMAA calculation includes the fully taxable portion of Roth conversions and other income sources, impacting Medicare premiums two years later—a critical point for retirees to understand before making large financial decisions.

Potential Solutions and Mitigation Strategies

Bob attempted to challenge the premium hike by filing Form SSA-44, designed to recalculate income due to life-changing events like marriage or spousal death. Unfortunately, the form does not apply to voluntary financial decisions such as Roth conversions. This underscores the limited avenues available to adjust IRMAA for retirees without a qualifying event.

Future retirees can mitigate unwelcome surcharges by carefully projecting how conversions impact their IRMAA bracket, potentially spreading out conversions over several years to stay within the same threshold. Proactively managing income levels can help avoid these pitfalls.

Key Considerations for Advisors

• Monitor taxable events: Ensure clients are aware of how Roth conversions and other income-affecting decisions impact IRMAA.
• Plan for spouse survivorship: When one spouse dies, the surviving spouse's income is recalculated under single filer thresholds, which can increase premiums.
• Educate about Form SSA-44 limitations: Understand the form's scope and only file when applicable under qualifying life events.

Final Thoughts on Roth Conversions and IRMAA Implications

Although Roth conversions offer long-term tax benefits, particularly by avoiding future required minimum distributions, retirees and advisors need to be aware of their potential to increase Medicare premiums due to IRMAA. Advisors should factor these charges into tax-saving scenarios to help clients make informed retirement decisions. While Bob's circumstances were temporary, similar situations can carry a lasting impact if not addressed as part of a comprehensive retirement strategy.