The tax break that shields most home sellers from a capital-gains bill is showing its age. When a primary residence is sold, an owner can exclude up to $250,000 of profit from tax, and a married couple filing jointly can exclude up to $500,000. Those figures were written into law in 1997 and have never been adjusted for inflation, even as home values have climbed for nearly three decades. The result is a growing number of longtime owners — retirees especially — discovering that the sale of a house they bought cheaply now produces a taxable gain above the limit.
What the exclusion covers and how to qualify
The break applies to the gain, not the sale price. Gain is the profit left after subtracting the original purchase price, the cost of major improvements, and selling expenses from the amount received. A couple who bought a home for $150,000, put $100,000 into renovations over the years, and sold for $700,000 would calculate their gain against that adjusted basis, not the full $700,000, before the exclusion is applied.
Two tests decide eligibility. According to IRS Publication 523, the seller must have owned the home and used it as a main residence for at least two of the five years before the sale, and the exclusion generally cannot be claimed more than once in a two-year period. The two years of use need not be continuous, which helps owners who spent stretches away, and special rules ease the tests for those who sell early because of a job move, health issue, or other unforeseen circumstance.
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Why a frozen limit catches more sellers each year
The problem is arithmetic. Because the $250,000 and $500,000 caps have stayed fixed since 1997 while home prices roughly tripled in many markets, a threshold that once covered nearly every seller now leaves a widening slice of gain exposed. An owner who bought a modest house in the late 1990s and stayed put through decades of appreciation can easily clear the single-filer limit, and the overflow is taxed as a long-term capital gain.
Widowhood sharpens the trap. When one spouse dies, the survivor generally has a limited window to sell while still claiming the full $500,000 couple’s exclusion; sell later as a single filer and only $250,000 applies. A surviving spouse who stays in a long-owned home for several years before downsizing can lose half the exclusion precisely when the sale of a highly appreciated house would benefit most from it.
Analysts have flagged the frozen figures as an unusual gap in a tax code that indexes most other thresholds. A policy analysis from the National Taxpayers Union Foundation notes that had the 1997 amounts kept pace with inflation, they would sit far higher today, and the erosion falls hardest on older owners who have held property the longest. Proposals to raise or index the limits have circulated in Congress, but none has become law.
What sellers can do about the gain above the line
The most overlooked lever is basis. Every qualifying improvement over the years — a new roof, an addition, a kitchen remodel, a replaced heating system — raises the home’s adjusted basis and shrinks the taxable gain, but only if the owner kept records. The agency’s guidance on selling a home stresses that documented improvements, not routine repairs, are what count, so receipts saved across decades can be worth thousands at sale.
Timing the sale also matters for the survivor rule. A widow or widower weighing when to move should factor in the shrinking exclusion, since selling within the eligible window after a spouse’s death can preserve the full $500,000. For couples still together, coordinating the sale in a year of lower other income can keep more of the taxable gain in the lower capital-gains brackets rather than the top one.
Recent tax legislation left the core numbers untouched. The 2025 tax law that reshaped several individual provisions did not raise the home-sale exclusion, and separate bills to eliminate the tax on primary-home sales have been introduced but not enacted. Owners planning around the break should treat the $250,000 and $500,000 figures as the operative amounts until Congress acts, rather than assuming relief is imminent.
The exclusion still spares the large majority of sellers, but its reach narrows a little more with every year of rising prices and continued inaction. For a retiree sitting on decades of appreciation, the open question is whether to sell now under a known rule, keep meticulous records to blunt the gain, or wait on a legislative fix that has been discussed for years without arriving.
This article was researched and drafted with the assistance of AI and reviewed by The Money Overview editorial team.
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