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A growing number of homeowners in New Mexico could be in for a tax shock when it comes time to sell. According to a new analysis by the National Association of Realtors®, 20.9% of homeowners in the state have built up more home equity than the federal capital gains exclusion allows. Another 3.5% have gains that exceed the $500,000 threshold used for married couples filing jointly.
The root of the issue? A capital gains tax policy that hasn’t changed since 1997. The federal exclusion—$250,000 for single filers and $500,000 for joint—was established when home prices were far lower. Since then, home values have soared more than 260% across the U.S.. That means many long-term homeowners now face taxes on what used to be protected equity.
New Mexico taxes capital gains as income, but provides a 40% deduction for most filers. The state rate can reach up to 5.9%. Combined with federal taxes, that can mean thousands in liability—especially for retirees or those cashing out after decades of ownership.
Equity that’s no longer a free ride
For homeowners who’ve spent years paying down a mortgage, rising values are supposed to be a reward. But for many, those gains are now taxable. That’s what experts are calling a home equity tax—and it’s catching people off guard.
In fast-appreciating parts of the state, like Santa Fe, Albuquerque, and Taos, longtime homeowners may not realize just how valuable their properties have become. But once they go to sell, a portion of those profits could go to the IRS—and to the state.
That’s leading to what economists describe as the “stay-put penalty.” Homeowners delay selling because they don’t want to trigger a tax hit. And when homes don’t turn over, buyers face fewer options and higher prices.
(Realtor.com)
How New Mexico compares in the Southwest
At 20.9%, New Mexico’s rate of homeowners above the $250K cap is lower than neighboring Arizona (48.5%) and Colorado (59.5%). But the trend is rising—and even modest homes could eventually hit the threshold.
The 3.5% of New Mexico owners already over the $500K exemption points to growing risk among long-term homeowners and retirees. And while that percentage might seem small, it represents thousands of households that could face five-figure tax bills when they sell.
These numbers challenge the idea that capital gains taxes only affect luxury homes. Appreciation over time—paired with outdated policy—means middle-class families are increasingly exposed. Capital gains tax on real estate is no longer a problem for just the wealthy.
What happens by 2035?
Looking ahead, the tax burden is expected to grow. By 2035, nearly 70% of all U.S. homeowners could exceed the $250,000 cap, and more than a third could go beyond $500,000. If the law doesn’t change, the tax pressure will expand significantly in New Mexico.
That’s why the real estate industry is supporting the More Homes on the Market Act. The proposal would double the capital gains exemption and index it to inflation—a move that could ease pressure on sellers and bring more inventory back to the market.
In the meantime, homeowners need to prepare. Know how much home equity you’ve built. Talk to a tax expert. And understand what portion of your profit might go to taxes—before you put up the For Sale sign. Because in New Mexico, selling your home could cost more than you planned.
This article was produced with editorial input from Dina Sartore-Bodo, Gabriella Iannetta, and Allaire Conte.