The Home Sale Tax Rule That Has Not Changed Since 1997 (And Why It Might Soon)

Long-Term Homeowners Are Facing a Problem Nobody Saw Coming

Owning a home for a long time used to feel like a straightforward path to financial security. Build equity, sell when the time is right, and move forward with a healthy profit. For millions of homeowners, that plan is now running into an obstacle that was never part of the original calculation: a tax rule written in 1997 that has never been updated for the world we actually live in today.

If you have owned your home for ten years or more and have been thinking about selling, this conversation is directly relevant to your financial picture.

What the Current Law Actually Says

The capital gains exclusion for home sales allows single filers to exclude up to $250,000 in profit from federal capital gains taxes when selling their primary residence. Married couples filing jointly can exclude up to $500,000. To qualify, you generally need to have lived in the home as your primary residence for at least two of the last five years.

When Congress set these thresholds in 1997, they were more than adequate for most sellers. The median home price in the United States at that time was a fraction of what it is today. Nearly three decades of appreciation, and particularly the dramatic price surge that occurred between 2020 and 2023, has left a growing number of long-term homeowners with gains that significantly exceed those limits.

The exclusion has never been adjusted for inflation. It has never been updated to reflect market reality. And that gap is now large enough to change behavior.

Why So Many Long-Term Owners Are Staying Put

The phenomenon playing out across the country is one that housing economists have started calling the lock-in effect, and capital gains exposure is one of its drivers. Homeowners who want to downsize, relocate, or simply move into a different chapter of their lives are running the numbers and pausing.

As Michael DeHaut Jr explains, the calculation for a long-term owner in a high-appreciation market can be sobering. A home purchased for $200,000 that is now worth $750,000 puts a single filer $300,000 above the current exclusion threshold. That overage is subject to capital gains tax, which for many sellers falls in the 15 to 20 percent federal range, before any applicable state taxes.

For a homeowner who was simply planning to sell and move on, that unexpected bill can be enough to make staying feel like the only sensible option.

What Lawmakers Are Debating

The conversation in Washington centers on two potential changes. The first is simply raising the exclusion caps to a higher fixed number that better reflects current home values. The second, and arguably more meaningful for the long term, is indexing the exclusion to inflation so that it adjusts automatically over time rather than remaining static for another generation.

The policy argument behind both proposals is partly about fairness and partly about housing supply. If raising the cap encourages more long-term owners to sell, those homes become available to buyers in markets that are struggling with limited inventory. Even a modest increase in listings could matter in communities where supply has been tight for years.

Not everyone agrees the impact would be significant. Some economists argue that most sellers already fall comfortably under the current thresholds and that the number of owners genuinely affected is smaller than the conversation suggests. The debate is ongoing, and no legislative changes have been finalized.

The Planning Mistakes That Are Costing Sellers Right Now

Regardless of what Congress ultimately decides, there are steps long-term homeowners can take today that directly affect their tax exposure at sale. One of the most overlooked is maintaining thorough documentation of capital improvements made over the years. Renovations, additions, new roofing, HVAC replacements, and other significant upgrades can be added to your cost basis, which reduces the size of your taxable gain. Without records, that reduction disappears entirely.

Timing also matters more than most sellers realize. The year in which a sale closes, your overall income for that year, and how the proceeds interact with other financial activity can all influence what you ultimately owe. These are decisions that benefit from planning well in advance of listing.

As Michael DeHaut Jr points out, the sellers who are best positioned are almost always the ones who started the conversation with a tax professional and a knowledgeable loan officer one to two years before they were ready to move, not one to two weeks after going under contract.

What You Should Be Doing Right Now

If you are a long-term homeowner sitting on significant equity and considering a move in the next one to three years, the time to get organized is now. Gather records of what you paid for the home and what you have invested in it since. Have a preliminary conversation with a tax advisor about your estimated gain and what your exposure might look like under current law. And connect with a loan officer who can help you think through how the sale fits into your broader financial and housing plan.

Michael DeHaut Jr works with long-term homeowners to navigate exactly these kinds of decisions before they become last-minute surprises. Reach out to Michael DeHaut Jr to start building a plan that protects what you have worked to build.

Sources

IRS.gov Forbes.com NAR.realtor TaxFoundation.org Realtor.com