He Retired From the Refinery on December 31. Closing on the House Two Days Earlier Put the Gain on His Last Full Salary and Raised Both Medicare Bills

A 68-year-old refinery foreman worked his last shift on December 31. He and his wife were already on Medicare. They had also sold their longtime home, and they pushed the closing up to December 30 so the move would be finished before year-end. That single scheduling decision put a $120,000 taxable gain on the same tax return as his last full salary, and two years later, both their Medicare bills reflected it.

A taxable home-sale gain can raise Medicare premiums two years after the year of sale, generally for one premium year. The sale alone does not qualify for relief from the income-related monthly adjustment amount, or IRMAA. Retirement can.

According to CMS data and Medicare Trustees reporting, income-related surcharges affect roughly 7% to 8% of Part B enrollees in a given year. A couple with joint modified adjusted gross income (MAGI) at or below $218,000 pays only the standard $202.90 monthly Part B premium. The real risk falls on households where a large one-time gain lands in the same year as wages, pushing MAGI over a threshold they would otherwise clear.

How One Week Moved the Gain Into a Different Tax Year

The return for the year of closing is the one that reports the home sale. After accounting for adjusted basis, selling costs, and the $500,000 home-sale exclusion this couple qualified for, the sale left $120,000 of taxable gain. For IRMAA purposes, Social Security uses MAGI, which adds tax-exempt interest to adjusted gross income. Whether they paid off the mortgage, bought the next house, or gave proceeds to the kids, that gain stayed in MAGI.

The gain is identical in both rows. The closing date only decides which return reports it, and that return sets the premium year two years out.

What a $300,000 Return Costs Two Medicare Enrollees

Joint MAGI of $300,000 falls in the 2026 bracket that covers $274,001 through $342,000, the second tier above the base. The 2026 IRMAA thresholds rose 2.8% from 2025 levels, and the standard Part B premium jumped 9.7% from $185 to $202.90, so the dollar cost of crossing a bracket is meaningfully higher than it was just one year ago.

For each spouse, the December scenario adds $2,434.80 per year in Part B surcharges and $450 in Part D surcharges, totaling $2,884.80 per person. Across both spouses for a full premium year, that is $5,769.60. The January scenario lands at $200,000, roughly $18,000 below the first IRMAA threshold, producing no surcharge at all. Even dialing the December return down to $274,000 would still trigger the first-tier surcharge of $81.20 for Part B and $14.50 for Part D per spouse each month.

This illustration uses 2026 rates, assumes both spouses carry Part B and Part D, and shows surcharges before any retirement-related adjustment. Actual 2028 and 2029 thresholds and surcharges may differ.

Social Security generally uses income from two years before the premium year. A December 2026 closing flows into 2028 premiums; a January 2027 closing flows into 2029. Without an adjustment, the higher Medicare cost from that December sale could follow the couple long after the last refinery paycheck arrived.

Where SSA-44 Helps, and Where It Stops

A voluntary income event like a home sale never qualifies as a life-changing event on Form SSA-44. Retirement is a different story. Stopping work is a qualifying life event, so the form deserves close attention. It asks Social Security to use a newer, lower MAGI estimate rather than the stale tax return.

In this case, his retirement could lead Social Security to use the couple’s lower 2027 income and eliminate the surcharge entirely. The December gain stays on the 2026 tax return, but that return would no longer drive their premiums if Social Security approves the adjustment. IRMAA is one of several premium traps covered in a free Medicare guide if you want the full picture before your next filing year.

Run the Return Both Ways Before You Sign

• Model two closing dates. Before accepting a year-end closing, have your tax preparer run the return with a December date and again with a January date. Include the full gain, both spouses’ Part B and Part D surcharges, and any income that drops once you retire.
• If you already closed in December, each spouse should request relief. File SSA-44 citing the work stoppage, attach retirement documentation, and provide the newer year’s joint MAGI including pensions, taxable withdrawals, and any realized gains.
• Ask whether buyers can wait a week. A short delay to push the closing into January costs little compared with a year or more of elevated Medicare premiums for two enrollees.

The gain is the same regardless of which return carries it. One week of calendar difference decides whether it lands on top of a full refinery salary or on a retiree’s income alone.

Editor’s note: This update adds 2026 context on how much IRMAA thresholds and the standard Part B premium have risen from 2025 levels (thresholds up 2.8%, premium up 9.7% to $202.90), and refines the CMS enrollment figure to reflect the Medicare Trustees Report range of roughly 7% to 8% of Part B beneficiaries subject to income-related surcharges.

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