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In Missouri, rising home values have helped many homeowners build substantial equity—but more than 1 in 10 are now discovering a tax surprise when they go to sell.
A federal capital gains rule, unchanged since the 1990s, is quietly taxing thousands of residents on the wealth they’ve accumulated just by staying put.
According to the National Association of REALTORS®, 14.3% of homeowners in Missouri now exceed the $250,000 capital gains exclusion for individual filers. Another 2.1% have surpassed the $500,000 limit set for married couples filing jointly. That means over 280,000 Missouri households may be vulnerable to what’s now being called a hidden home equity tax.
A rule that no longer matches the market
The capital gains exclusion, designed in 1997, was meant to protect homeowners from being taxed on the sale of their primary residence. The limits—$250,000 for singles and $500,000 for couples—seemed generous then. But they’ve never been adjusted for inflation, even as home values have soared.
Nationally, prices have increased more than 260% since the exemption was set. If indexed to inflation, the thresholds today would exceed $660,000 and $1.32 million. Without that adjustment, Missouri homeowners who bought decades ago and stayed through appreciation are discovering they may owe capital gains tax when selling, even on average-priced homes.
Missouri adds to the burden by taxing capital gains at its flat income tax rate of 4.95%. When combined with federal taxes, that means a meaningful portion of a seller’s gain could go to the government.
Modest homes, significant liabilities
This isn’t just a problem for luxury properties in St. Louis or Kansas City. Across the state, longtime homeowners are discovering that their equity gains have quietly grown into taxable territory.
According to NAR data, the average homeowner exceeding the $250,000 cap in Missouri faces taxes on $88,889 in additional gains. For those over the $500,000 exclusion, the average taxable gain climbs to $140,664. That can translate to five-figure tax bills—especially daunting for retirees or families relying on the sale to fund their next move.
As a result, many choose not to list at all, creating what economists call a “stay-put penalty.” This behavior reduces inventory and contributes to the housing market slowdown, even in states like Missouri where demand remains high.
What to expect by 2035
Missouri’s exposure is set to rise sharply over the next decade. By 2035, 47.5% of homeowners in the state are projected to exceed the $250,000 exclusion. And 11.5% are expected to go over the $500,000 limit.
That means nearly half the state’s sellers could soon face tax consequences under the current rules, unless federal law changes. It’s a key reason why advocates say reform is long overdue.
A policy fix with broad support
To address the growing tax burden on homeowners, lawmakers are pushing for the More Homes on the Market Act. The bill would double the exclusion limits and tie them to inflation moving forward—helping homeowners keep more of the wealth they’ve built.
“Equity shouldn’t be a trap,” says Shannon McGahn, chief advocacy officer at the National Association of REALTORS®. “It should be a stepping stone for the next chapter”.
Until then, Missouri homeowners should take steps to understand how capital gains tax applies to real estate. With smart timing and proper financial advice, more sellers can protect their equity and make confident decisions about their next move.
This article was produced with editorial input from Dina Sartore-Bodo, Gabriella Iannetta, and Allaire Conte.