The short answer
IRMAA looks at your income from two years ago, and it doesn't distinguish between steady income and a one-time event. So a single large transaction — selling a home, a Roth conversion, or realizing capital gains — can push your income over an IRMAA threshold and raise your Medicare premiums two years later, even if your income returns to normal after that.
This surprises a lot of people: they do one big financial move, then get a higher Medicare bill they didn't see coming.
How the spike hits
Because Medicare uses your modified adjusted gross income from two years prior, a big gain in one year raises your MAGI for that year, which then determines your Part B and Part D premiums two years out. The surcharge typically lasts a year and then falls off once your income returns to normal — but that year of higher premiums can be substantial. Our guide to the 2026 IRMAA brackets shows the thresholds.
The home-sale case is common: even after the primary-residence exclusion, a large gain can spill into IRMAA territory.
How to plan around it
If you're planning a big transaction, look at whether spreading it over years, timing it before Medicare, or offsetting gains could keep you under a threshold. Roth conversions in particular can be sized annually to manage IRMAA — our guide to Roth conversions in your 60s covers that strategy. And if the spike was truly one-time, remember the surcharge usually falls off the following year.
The goal isn't to avoid smart financial moves, just to time them with the two-year IRMAA lookback in mind.
Frequently Asked Questions
Can a home sale raise my Medicare premiums?
Yes. A large capital gain from selling a home can push your income over an IRMAA threshold, raising your Part B and Part D premiums two years later — even after the primary-residence exclusion.
How long does a one-time IRMAA surcharge last?
Usually about a year. Once your income returns to normal, the surcharge typically falls off, since IRMAA re-evaluates each year based on income from two years prior.
How can I reduce IRMAA from a big transaction?
Consider spreading the transaction over years, timing it before Medicare, offsetting gains, or sizing Roth conversions annually to stay under a threshold.
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