They Sold a $1.55 Million House, Bought Another for Cash, and Still Faced Higher Medicare Premiums

A married couple can sell their longtime home, buy a smaller one outright, avoid debt, and still be surprised by a Medicare bill two years later. The piece most sellers overlook is what can set it off.

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Picture a couple in their late 60s who sells a house they have owned for decades for $1.55 million. They then pay $725,000 in cash for a smaller property and keep the rest after costs and taxes. With no mortgage and no new pension income, nothing about the move looks like a raise. They assume Medicare will not be affected. Two years later, both receive premium notices with an added surcharge.

Most Medicare beneficiaries do not pay income-based surcharges. The Centers for Medicare & Medicaid Services says about 8% of Part B enrollees do. For joint filers in 2026, those extra charges start once income rises above $218,000. A home sale can push a couple past that threshold if enough of the gain is taxable. The figures below use 2026 Medicare rates to show the possible cost.

Taxable Gain, Not Sale Price, Drives the Surcharge

Medicare does not use the sale price or the money left after closing. Social Security looks at modified adjusted gross income, or MAGI, which is adjusted gross income plus tax-exempt interest. Even municipal bond interest that seems tax-free is included.

The home sale affects that amount through taxable gain. Say the couple originally paid $450,000 for the home, spent $150,000 on qualifying improvements and paid $85,000 in eligible selling expenses. After subtracting those amounts from the $1.55 million sale price, the gain comes to $865,000.

Married couples filing jointly can usually exclude up to $500,000. At least one spouse must meet the two-year ownership test, and both must satisfy the two-year residence test within the five years before the sale. In general, neither spouse can have used the exclusion on another home sale in the prior two years.

If they qualify for the full exclusion and have no other basis adjustments, $365,000 of gain remains taxable.

That $365,000 Gain Can Reappear in Premiums Later

Social Security generally relies on tax information from two years earlier when determining premiums. A closing in one year therefore affects premiums two years later. The 2028 brackets have not been released, so the 2026 brackets below are used only as an example.

For this example, assume the couple has another $120,000 of income after accounting for the taxable portion of their Social Security. Without the house sale, each spouse would owe the standard $202.90 monthly Part B premium under 2026 rules. With the added $365,000 taxable gain, their income rises to $485,000.

If both spouses have Part B and Part D coverage, those 2026 rates would add $529.60 per person each month, or $12,710.40 over a year for the couple. That is before counting their regular premiums. Even the lowest surcharge tier would cost two people with both types of coverage an extra $2,296.80 a year.

A one-time gain usually affects only one premium year. Income in the following year would normally determine premiums two years after that, so the surcharge may ease or disappear if income declines. Selling a home before Medicare starts avoids the increase only if the sale falls outside the tax years Social Security uses. The surcharge is known as an income-related monthly adjustment amount, or IRMAA. IRMAA is one of several Medicare surprises that can catch retirees off guard.

Buying Another Home Does Not Erase the Gain

Many sellers assume that using the proceeds to buy a replacement home defers the gain. Under current law, there is no rollover rule. The $725,000 purchase simply becomes the basis of the new home, while the full $365,000 still counts as income for tax purposes.

Simply selling a home does not, by itself, qualify as a life-changing event that can lower the surcharge. A separate event such as retirement, fewer work hours or a spouse’s death may support a request through Form SSA-44 if it lowers the income Social Security uses. An incorrect income figure or an amended return can also justify a review. Saying the home-sale gain will not happen again is not enough.

Check the Numbers Before Closing

• Estimate the gain before you list. Begin with the expected sale price and subtract eligible selling expenses. Then subtract your adjusted basis, usually what you paid plus qualifying improvements, and any home-sale exclusion you qualify for. Add the taxable gain to your other income to gauge the Medicare effect. Current brackets can show the size of the risk, but the actual premium year will depend on rates that have not yet been announced.
• Keep records of every improvement. A documented kitchen remodel or new roof lowers taxable gain by the same amount. The IRS says to keep these records until three years after the due date for the return for the year you sold the home.
• Review other taxable income before you close. A Roth conversion or an optional retirement-account withdrawal in the same year could raise income further, so compare the timing before moving ahead. An installment sale may spread taxable gain across several years, but it also delays the cash and adds the risk that the buyer may not pay. A tax adviser should review that option before you rely on it to reduce Medicare surcharges.