A 68-year-old widower sold the four-bedroom colonial he had owned since 1994, moved into a low-maintenance condo, and pocketed a check large enough to feel like freedom. Two years later, his Medicare Part B premium arrived at exactly twice the standard amount. Nothing about his lifestyle had changed. His 2024 tax return had.
The 2026 IRMAA surcharge kicks in when 2024 modified adjusted gross income exceeds $109,000 for single filers or $218,000 for joint filers. Fewer than 1 in 10 Part B beneficiaries pay IRMAA at all. For retirees who triggered a one-time income spike two years ago, the tax return may feel like old news. The Medicare bill, though, is arriving right now.
The two-year lookback locks in 2024 income
Social Security generally sets each year’s IRMAA using the tax return from two years prior. The 2024 return drives 2026 premiums. The 2025 return drives 2027. The 2026 return will drive 2028. A subsequent drop in income does not erase a voluntary home-sale gain unless a qualifying life-changing event also applies.
MAGI for IRMAA is adjusted gross income (Form 1040 line 11) plus tax-exempt interest from line 2a. Municipal bond coupons that feel tax-free still count. So does any taxable capital gain from a home sale that survives the primary-residence exclusion, which can shield up to $250,000 of gain for a single filer or $500,000 for a married couple filing jointly.
Here is where the widower got hit. He bought the house for $180,000, sold it for $520,000 after selling costs and improvements, and realized a gain of roughly $338,000. As a single filer, he shielded $250,000 and reported the remaining $88,000 as long-term capital gain. Add about $52,000 of taxable Social Security, pension income, and interest, and his 2024 MAGI cleared $140,000.
What the second IRMAA tier costs in 2026
CMS published the 2026 brackets on November 14, 2025. The standard Part B premium came in at $202.90 per month, up from $185.00 in 2025, a jump of roughly 9.7%. The widower’s MAGI of $140,000 places him in the second IRMAA tier for single filers, covering income above $137,000 and up to $171,000. There, the surcharge matches the standard premium dollar for dollar, adding another $202.90 per month and pushing his total Part B cost to $405.80. Precisely double.
Part D adds to the damage. At $140,000 of MAGI, the Part D IRMAA is $37.50 per month on top of whatever his drug plan charges. His combined Part B and Part D IRMAA reaches $240.40 per month, or $2,884.80 for the year. The one saving grace: IRMAA is redetermined annually. If his 2025 income fell below the applicable threshold, his 2027 premium will drop with the next tax return.
It is also worth noting that the 2026 IRMAA income thresholds rose by only about 1% over the prior year, reflecting a modest CPI-U adjustment. That narrow bracket movement means some retirees crossed an IRMAA line in 2026 through routine income growth alone, without any single large transaction like a home sale.
SSA-44 will not save him
The form readers reach for first is the wrong one here. SSA-44 lets Social Security recalculate IRMAA after a qualifying life-changing event: marriage, divorce or annulment, death of a spouse, work stoppage, work reduction, certain losses of income-producing property, loss of pension income, or an employer settlement payment. A voluntary home sale is not on the list. A primary residence generating a one-time capital gain does not qualify on its own.
Three actions that actually change the bill
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Model the bracket before signing the listing agreement. A single filer with $95,000 in other MAGI can use the home-sale exclusion without increasing IRMAA if the entire gain is excluded. Add $50,000 of taxable gain and the 2026 Part B premium moves to $405.80, because MAGI reaches $145,000. Add $80,000 and the same second-tier surcharge applies. The threshold drives the outcome, not the sale price alone.
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Consider timing before the closing date is fixed. An installment sale may spread taxable gain across multiple years, and legitimate basis adjustments or selling expenses can reduce the taxable amount if properly documented. A delayed closing can also shift the income into a different tax year. These moves require tax advice before the contract is signed, because the Medicare result follows directly from the tax return.
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If a qualifying event actually occurred, file SSA-44 with documentation. A retirement letter, death certificate, or divorce decree may support the form when the event reduced income. Voluntary Roth conversions and home sales do not qualify on their own, regardless of how much they raised MAGI.
The sale price is not the Medicare number
A home sale can be the right financial move and still produce a one-year Medicare surprise. The figure that matters is not the check at closing. It is the taxable gain that survives the primary-residence exclusion, added to the rest of the retiree’s MAGI. Once that combined number crosses an IRMAA line, the premium change arrives two years later, long after the moving boxes are gone and the new address feels like home.
Figures reflect the 2026 plan year. Medicare Part B premium, IRMAA threshold, and Part D IRMAA figures come from CMS’s 2026 Medicare Parts A & B Premiums and Deductibles fact sheet. Home-sale exclusion rules come from IRS Topic No. 701 and IRS Publication 523. SSA-44 qualifying life-changing events come from Social Security Administration Form SSA-44.
Editor’s note: This update adds the 2026 Part B annual deductible of $283, notes that the standard premium rose roughly 9.7% from 2025 to 2026, and includes context on the modest CPI-U bracket adjustment of approximately 1% that caused bracket creep for some retirees in 2026 without any large income event.
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