Realtor.com
Wisconsin homeowners have quietly built wealth through rising property values over the past few decades—but many may now face a financial surprise when it’s time to sell.
According to the National Association of REALTORS®, 17.7% of homeowners in Wisconsin exceed the federal capital gains tax exemption, putting them at risk of what experts are calling the “hidden home equity tax”.
This tax burden—once considered a problem only for high-cost markets—is becoming more common in states like Wisconsin, where moderate prices and long-term ownership are now pushing families into taxable territory.
A tax cap that time forgot
Federal capital gains law allows homeowners to exclude up to $250,000 in profits from the sale of a primary home—or $500,000 for married couples filing jointly. These exemptions were established in 1997 and haven’t changed since.
In the 27 years since the law was passed, home prices across the U.S. have climbed more than 260%. While the value of real estate has risen dramatically, the tax code hasn’t kept pace.
In Wisconsin, the average gain above the $250,000 cap is $89,566. For the 2.6% of households who exceed the $500,000 threshold, the average taxable gain is $119,474—resulting in a potential federal tax bill of $20,904.
On the state level, Wisconsin taxes capital gains as income, but provides a 30% deduction for long-term gains. This lowers the effective maximum tax rate to around 4.2%. Still, for longtime homeowners, especially those on fixed incomes, the combined federal and state tax burden can add up fast.
A moderate market with rising exposure
At 17.7%, Wisconsin’s exposure rate is considered midrange nationally—but that number doesn’t tell the full story. In cities like Madison, Milwaukee, and Green Bay, longtime residents are increasingly falling into taxable gain territory simply because they’ve owned their homes for decades.
These are often retirees or middle-class families who followed the conventional wisdom of staying put and paying down their mortgage. Now, that diligence is being penalized.
Unlike in places such as Texas or Florida, which have no state income tax, Wisconsin’s tax structure means homeowners here face both federal and state levies when their home value appreciation exceeds the exemption.
2035: trouble on the horizon
While 17.7% of homeowners may be affected today, that number is expected to grow. By 2035, the National Association of REALTORS® projects that nearly 70% of U.S. homeowners will exceed the $250,000 capital gains exemption. More than 38% will surpass the $500,000 mark.
That forecast means more Wisconsinites are likely to face what economists call the “stay-put penalty.” Rather than selling and triggering a tax bill, many will opt to stay in place—even when they might prefer to downsize, relocate closer to family, or move into assisted living.
This trend has major consequences. When equity-rich homeowners don’t sell, fewer homes are available for first-time buyers or growing families. The result is tighter inventory and increasing home prices—a cycle that frustrates buyers and strains the broader housing market.
A legislative proposal
To solve this problem, lawmakers have introduced the More Homes on the Market Act. This bipartisan bill proposes to double the capital gains exemption to $500,000 for individuals and $1 million for married couples. It would also index the limits to inflation going forward.
There is also the No Tax on Home Sales Act, introduced by Representative Marjorie Taylor Greene from Georgia, on July 10 that, if passed, would eliminate federal taxes on home sales entirely.
Specifically, the bill would eliminate the federal capital gains tax on the sale of primary residences—a measure that the congresswoman said would help homeowners, including those in Wisconsin, struggling with affordability issues and encourage mobility in the U.S. housing market.
Until then, Wisconsin homeowners should take stock. The equity they’ve built may carry a hidden cost—one that could affect retirement plans, family transitions, or long-term financial security.
The NAR Chief Advocacy Officer Shannon McGahn describes the issue as a looming crisis: “Building equity shouldn’t come with a penalty—it should come with opportunity.” Without reform, McGahn warns, the number of Americans caught off guard by tax bills will only grow.