The House They Bought for $62,000 in 1984 Sold for $890,000. The Tax Exclusion Stopped at $500,000. Medicare’s Bill Started There.

Selling a home for $890,000 leaves roughly $328,000 taxable after the $500,000 joint exclusion, adding $9,240 in Medicare surcharges two years later.

Section 121's $500,000 joint exclusion ceiling hasn't risen with inflation since 1997, leaving longtime homeowners exposed to large taxable gains on ordinary homes.

Rebuilding cost basis with documented improvements, deferring optional IRA withdrawals, and budgeting for the Medicare surcharge from proceeds reduces the sale's financial impact.

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For more than 40 years, the house did exactly what its owners hoped it would do. A couple who paid $62,000 for their home in 1984 closes on the sale this year at $890,000. The IRS lets them exclude up to $500,000 of gain under Internal Revenue Code Section 121. Any taxable gain left after the exclusion, basis adjustments and selling expenses flows into adjusted gross income (AGI). That figure helps determine the modified adjusted gross income (MAGI) Social Security uses to calculate Medicare's income-related monthly adjustment amount (IRMAA) two years later. The sale closes in 2026. The Medicare bill arrives in 2028.

Section 121 generally excludes up to $250,000 of gain for a single homeowner and $500,000 for a married couple filing jointly. For the full joint exclusion, one spouse generally must satisfy the ownership test, both must have used the property as their principal residence for at least two of the previous five years, and neither can have used the exclusion on another sale during the prior two years.

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On this sale, the raw gain is $828,000. Subtract the joint exclusion and roughly $328,000 remains before documented improvements increase the basis and selling expenses reduce the amount realized. That remainder is taxable long-term capital gain reported on the return. The $250,000 and $500,000 limits were written into law in 1997 and were not indexed for inflation. A ceiling that once looked generous has spent nearly three decades standing still while longtime owners watched ordinary homes accumulate extraordinary gains.