The Home Sale Pushed Them Into the Third IRMAA Tier. Medicare Charged Him $2,435 More for the Year. Then It Charged Her the Same
Selling a house you have lived in for decades feels like a windfall, but one retired couple discovered that a single line on their tax return quietly triggered two separate Medicare bills they never saw coming.
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A retired couple in their early 70s sold the house they had lived in for 32 years in 2024. After adjusted basis, selling expenses, and the Section 121 exclusion, the taxable gain came to $120,000. Their ordinary joint MAGI that year was $180,000, so the sale pushed the return to $300,000. Twenty months later, two Medicare premium notices arrived in the mail. Both said the same thing: the Part B premium was rising to $405.80 a month. Let’s assume both spouses were enrolled in Part B and had Medicare drug coverage, so each also encountered the Part D surcharge.
If your household MAGI two years ago sat under $218,000 for joint filers, this does not affect you. The Income-Related Monthly Adjustment Amount, commonly called IRMAA, only reaches roughly 8% of people with Medicare Part B. But if a home sale, a Roth conversion, or a large RMD is on the calendar, the mechanic below matters and is the one that surprises people most.
One Joint Return, Two Separate Medicare Bills
Social Security uses the couple’s joint MAGI to identify which IRMAA bracket applies. The premium itself is individual. Each spouse enrolled in Part B pays the full premium assigned to that bracket. There is no household surcharge to divide and no family cap. When both are enrolled, the same charge appears on two separate notices.
The $300,000 return landed the couple in the 2026 bracket for joint MAGI greater than $274,000 and less than or equal to $342,000. That bracket carries a Part B income-related adjustment of $202.90 a month per person, on top of the $202.90 standard premium, for a total Part B premium of $405.80 each. It also carries a Part D adjustment of $37.50 a month per person.
Run the 2026 Numbers
- Extra Part B for him: $202.90 monthly, or $2,434.80 annually.
- Extra Part B for her: another $2,434.80.
- Household Part B increase: $4,869.60.
- Part D surcharge, each: $450 annually.
- Combined Part B and Part D increase per spouse: $2,884.80.
- Household total, one year: $5,769.60.
Medicare assessed the same per-person amount twice because the count of enrolled beneficiaries doubled. If you have a spouse on Medicare and a big income event coming, read that again.
Medicare sees the number that reaches adjusted gross income, not the sale price on the settlement statement. Adjusted basis and eligible selling expenses come off first, then the Section 121 exclusion of up to $250,000 for a qualifying single seller or $500,000 for a qualifying married couple. What remains is the taxable gain. Rolling the proceeds into the next house does not shield any of it from MAGI.
Two Years Too Late
Social Security uses the tax return from two years earlier, so a 2024 sale sets the 2026 premium. If 2025 income drops back to normal, the surcharge generally disappears when that later return works through the lookback, meaning the 2026 spike is a one-year event for a one-year gain.
The home sale by itself will not support an SSA-44 request because a voluntary sale is not a qualifying life-changing event. If one spouse also retired or experienced another event and household income subsequently fell, the door may remain open to ask Social Security to use an updated income figure.
What to Do Before Signing the Closing Papers
- Estimate the taxable gain and tack it on to every other MAGI source expected that year: wages, pensions, taxable Social Security benefits, RMDs, Roth conversions, and tax-exempt interest. Locate the resulting bracket in the CMS table, then multiply the Part B and Part D surcharges by the number of spouses on Medicare.
- If the gain lands the household within about $10,000 of a lower bracket, consider whether moving the closing into January of the next tax year keeps the sale from stacking on top of other income.
- If the household income is within one bracket of an IRMAA cliff and a home sale, business sale, or large conversion is on the horizon, a fee-only advisor who models the two-year lookback can price out whether spreading the event across tax years saves money net of taxes.
One joint return. Two premium notices. $2,435 more for him, the same for her, and nearly $5,770 pulled from the household in a single year because both names were on the Medicare rolls when the tax return crossed the bracket. IRMAA is only one of several premium traps built into the program, and we cataloged the rest in a free Medicare guide here.
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Gerelyn Terzo is the author of dividend investing handbook "Dividend Investing Strategies: How to Have Your Cake & Eat It Too." A veteran financial journalist, she covers agri-finance for outlets like Global AgInvesting and the broader stock market and personal finance for 24/7 Wall Street. She began at CNBC and later helped launch Fox Business in New York. Gerelyn currently resides in Woodland Park, Colorado and dabbles in nature photography as a hobby.
