They Sold Their Home for $1.55 Million and Bought a $725,000 House With Cash. Their Medicare Premiums Could Still Climb

Imagine a married couple in their late 60s selling the house they owned for decades for $1.55 million. They pay $725,000 in cash for a smaller place and bank what remains after selling expenses and taxes. They take on no mortgage and no new pension, and nothing about the move looks like a raise. Both assume Medicare will never notice. Two years later, each receives a premium notice with a surcharge attached.

Most Medicare beneficiaries don’t pay income-related surcharges. The Centers for Medicare & Medicaid Services (CMS) puts the share at roughly 8% of people with Part B. For joint filers in 2026, those extra charges begin above $218,000 of income. A home sale can push a couple across that line if enough of the gain is taxable. The dollar examples below use 2026 Medicare rates to illustrate the potential cost.

Taxable Gain Sets the Bill, Whatever the Sale Price

Medicare doesn’t base the surcharge on the sale price or the cash left over. Social Security uses modified adjusted gross income (MAGI): adjusted gross income plus tax-exempt interest. Municipal bond interest that feels tax-free still counts.

The home sale enters that figure through its taxable gain. Suppose the couple paid $450,000 for the house, made $150,000 in qualifying improvements and incurred $85,000 in eligible selling expenses. Subtracting those amounts from the $1.55 million sale price leaves an $865,000 gain.

A married couple filing jointly can generally exclude up to $500,000. At least one spouse must meet the two-year ownership test, and both must meet the two-year residence test, measured over the five years before the sale. Generally, neither can have used the exclusion on another home sale within the previous two years.

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

A $365,000 Gain Shows Up in Your Premiums Two Years Later

Social Security generally uses tax data from two years prior to the year for which the premium is being determined. A 2026 closing therefore sets 2028 premiums. The 2028 brackets aren’t published yet, so the 2026 brackets below serve as an illustration.

For this illustration, assume their other income contributes $120,000 to modified adjusted gross income, after accounting for how much of their Social Security is taxable. Without the sale, each spouse would pay the standard $202.90 monthly Part B premium under 2026 rules. Add the $365,000 taxable gain, and their income reaches $485,000.

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

A one-time gain generally affects one premium year. Their 2027 income would ordinarily determine their 2029 premiums, so the surcharge could fall or disappear if their income drops. Selling before Medicare begins can avoid the increase only if the sale falls outside the tax years Social Security uses. The charge is called an income-related monthly adjustment amount, or IRMAA. (IRMAA is one of several Medicare traps that catch retirees off guard, and we listed the rest in a free guide here.)

Buying a New House Leaves the Gain Taxable

Many sellers think putting the money into a replacement home postpones the gain. Current law has no rollover. The $725,000 purchase only sets the cost basis of the new house, and the full $365,000 still counts as 2026 income.

Selling a home voluntarily is not, by itself, a qualifying life-changing event for lowering the surcharge. A separate event, such as retirement, reduced work hours or a spouse’s death, may support a request through Form SSA-44 if it reduces the income Social Security uses. An incorrect income figure or an amended tax return can also justify a review. Simply explaining that the home-sale gain won’t happen again is not enough.

Run These Numbers Before You Sign Closing Papers

• Figure the gain before you list. Start with the expected sale price and subtract eligible selling expenses. Then subtract your adjusted basis, generally what you paid plus qualifying improvements, and any home-sale exclusion you qualify for. Add the taxable gain to your other income to estimate the Medicare impact. Current brackets can show the scale of the risk, but the actual 2028 bill depends on rates that haven’t been announced.
• Save every improvement receipt. A documented kitchen remodel or new roof cuts taxable gain by the same amount. The IRS says to keep these records until 3 years after the due date for your tax return for the year in which you sold your home.
• Review other taxable income before closing. A Roth conversion or an optional retirement-account withdrawal in the same year could push income higher, so compare the timing before proceeding. An installment sale may spread taxable gain across years, but it also delays receipt of the proceeds and introduces the risk that the buyer won’t pay. Have a tax adviser evaluate that arrangement before relying on it to reduce Medicare surcharges.

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