Medicare's Income-Related Monthly Adjustment Amount (IRMAA) can significantly boost your Part B and Part D premiums. Understanding the two-year lookback rule is key to minimizing these surcharges.
Two-Year Lookback Explained
Medicare uses your modified adjusted gross income (MAGI) from two years prior to determine your premium. For example, your 2026 IRMAA is based on your 2024 tax return. Strategic planning can help you stay below the income thresholds.
Key Strategies
- Roth Conversions: Complete Roth conversions before age 63 or during low-income years to avoid pushing your MAGI over the limit in a lookback year.
- Required Minimum Distributions (RMDs): Use Qualified Charitable Distributions (QCDs) from your IRA to reduce taxable income. QCDs count toward RMDs but are not included in MAGI.
- Capital Gains Timing: Bunch capital gains or losses into alternate years to keep MAGI down in lookback years.
- Municipal Bond Income: While often tax-free, some municipal bond interest may be included in MAGI for IRMAA purposes. Verify your holdings.
Common Pitfalls
- A one-time large Roth conversion can trigger IRMAA for two years (the conversion year and the following year).
- Selling a home with large gains can spike MAGI in the lookback window.
- Spousal income from a business sale may cause similar issues.
Actionable Steps
- Check your past two years' tax returns to project IRMAA exposure.
- Plan Roth conversions in years when your other income is low.
- Consider delaying Roth conversions until after age 72 (RMD age) to reduce pre-RMD income.
- Use a tax professional to model your MAGI across multiple years.
By staying aware of the two-year lookback and using tools like QCDs and strategic Roth conversions, retirees can lower their Medicare premiums and keep more of their nest egg.
"IRMAA planning is about managing your Modified Adjusted Gross Income two years before Medicare starts," says Professor Erica in the video.