He Cashed Out $90,000 of Company Stock at 64 to Pay Off the House. At 66, Medicare Charged Him Two Brackets More for a Year, and Nobody Connected the Two
Selling company stock to pay off the mortgage felt like a clean finish, but a quiet federal rule turned that single transaction into a premium penalty that showed up two years later and nobody at the brokerage or Social Security…
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This scenario is common in retirement planning, as a worker approaching retirement holds a concentrated position in company stock, decides at 64 that paying off the mortgage feels better than carrying it into retirement, and sells about $90,000 worth to pay it off. The house is clear, and the plan works, at least for a while. Two years later, the first Medicare bill arrives, and the Part B premium is hundreds of dollars higher than the standard amount, and it stays that way for twelve months. Nobody at the brokerage, the mortgage servicer, or the Social Security office mentioned that the sale would be doing this to him at 66.
The mechanism is Medicare’s Income-Related Monthly Adjustment Amount, better known as IRMAA. It is a surcharge added to Part B and Part D premiums for higher-income beneficiaries, and it uses modified adjusted gross income from the tax return filed two years earlier. A 2024 stock sale shows up on the 2024 return, which determines 2026 premiums. The lag is baked in by statute, which is why the connection is easy to miss.
How the 2026 Brackets Actually Work
The standard Part B premium in 2026 is $202.90 per month, up $17.90 from $185.00 in 2025. That is what a single filer pays as long as MAGI stays at or below $109,000. Above that, the surcharges begin, and they move in steps rather than a smooth curve.
For a single filer in 2026, the tiers work like this: MAGI greater than $109,000 and up to $137,000 adds $81.20, bringing the total to $284.10. Between $137,000 and $171,000, the surcharge is $202.90, for a total of $405.80. Between $171,000 and $205,000, the surcharge is $324.60, for a total of $527.50. Between $205,000 and $500,000, it is $446.30, or $649.20 total. At $500,000 or above, the surcharge is $487.00, for a total of $689.90. Joint filers get double the income thresholds but the same premium math.
Part D carries its own IRMAA schedule on top of whatever the drug plan itself charges. The first Part D surcharge kicks in at the same $109,000 individual threshold and adds $14.50 per month, rising through the same income tiers. Both surcharges are applied for the full calendar year and cannot be prorated.
Where the $90,000 Sale Lands
Assume the retiree in question was earning roughly $70,000 in wages the year of the sale. A $90,000 long-term capital gain layered on top pushes MAGI into the $160,000 range. That falls inside the $137,000 to $171,000 tier, which carries a Part B total of $405.80. Compared with the standard $202.90, the monthly difference is roughly $203, or about $2,400 for the year on Part B alone. Add the Part D surcharge for the same tier and the annual hit grows further. That is what “two brackets more” refers to in the headline: the jump from the standard bracket to the third tier up.
A Relief Valve Most People Miss
Social Security accepts Form SSA-44 to request an IRMAA reduction after a life-changing event. The qualifying events are specific: marriage, divorce, death of a spouse, work stoppage, work reduction, loss of income-producing property, loss of pension income, or employer settlement payment. A one-time capital gain from selling appreciated stock does not appear on that list. Retirement itself can qualify as work stoppage, which is why the SSA-44 route sometimes helps in the first Medicare year, but it does not erase a bracket bump caused by the sale itself.
What to Watch Before a Big Liquidation
The planning window closes the moment a sale settles. Before that, spreading a large position across two tax years can keep MAGI under the next IRMAA threshold in both. Charitable giving, qualified charitable distributions after 70, and harvesting losses in the same tax year can pull MAGI back down (we cataloged the IRMAA tiers alongside the other surcharges and coverage gaps that ambush retirees in a free guide: Medicare’s Hidden Bills).
And because the 2027 Social Security COLA is tracking toward 3.3% while the Part B premium already climbed $17.90 for 2026, the cost of an unplanned bracket jump lands on top of premium increases that are eating into the COLA anyway. The mortgage got paid off. The premium bill for that decision arrived twenty-four months later.
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David Beren has been a Flywheel Publishing contributor since 2022. Writing for 24/7 Wall St. since 2023, David loves to write about topics of all shapes and sizes. As a technology expert, David focuses heavily on consumer electronics brands, automobiles, and general technology. He has previously written for LifeWire, formerly About.com. As a part-time freelance writer, David’s “day job” has been working on and leading social media for multiple Fortune 100 brands. David loves the flexibility of this field and its ability to reach customers exactly where they like to spend their time. Additionally, David previously published his own blog, TmoNews.com, which reached 3 million readers in its first year. In addition to freelance and social media work, David loves to spend time with his family and children and relive the glory days of video game consoles by playing any retro game console he can get his hands on.
