The Home Sale Tax Rule From 1997 That May Finally Be Getting an Update

A Rule Built for a Different Era Is Creating Real Problems Today

If you have owned your home for a decade or more, the equity you have accumulated represents years of financial discipline and commitment. For many long-term homeowners that equity is the single most valuable asset they own. But a tax rule that has not been touched since 1997 is quietly turning that financial success into a reason to stay put rather than move forward, and that dynamic is now serious enough to have caught the attention of lawmakers in Washington.

Understanding what is being discussed and why it matters could have a direct impact on the financial outcome of a decision you may be considering in the next few years.

What the Current Law Says

Federal tax law allows homeowners who sell their primary residence to exclude a portion of their profit from capital gains taxes. Single filers can exclude up to $250,000 in gains. Married couples filing jointly can exclude up to $500,000. To qualify, the home must have been your primary residence for at least two of the last five years before the sale date.

When these thresholds were written into law in 1997, they were calibrated for a housing market that looked nothing like today. The median home price in the United States at that time was well under $200,000, and the exclusions were generous enough to cover virtually every seller without any tax exposure. 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 blow past those limits by a significant margin.

The thresholds have never been adjusted for inflation. They have never been updated to reflect what has happened to home values. And the gap between a 1997 rule and a 2025 housing market is now large enough to change real behavior for real people.

The Lock-In Effect Showing Up Across the Country

The consequence of this outdated policy is playing out in housing markets in a very visible way. Long-term homeowners who are ready for a change, whether that means downsizing, relocating, or moving into a different chapter of life, are running the numbers on what selling would actually cost them and deciding that staying is the smarter financial move.

As John Cobain explains, this is not a hypothetical concern for a small number of people. A homeowner who purchased their property for $200,000 and is now sitting on a home worth $750,000 faces a gain of $550,000. For a single filer, that puts $300,000 above the current exclusion threshold and potentially subject to federal capital gains tax at rates that can reach 20 percent before any applicable state taxes are factored in. What was supposed to feel like a reward for years of smart homeownership decisions suddenly looks like a financial penalty for wanting to move on.

When enough homeowners make this calculation simultaneously and decide to hold rather than sell, the effect on housing supply is real and measurable. Homes that would otherwise come to market simply do not, and inventory in communities that could benefit from more listings stays constrained.

What Is Being Discussed in Washington

The policy conversation now happening among lawmakers centers on two potential approaches to modernizing the exclusion. The first is raising the caps to a new fixed amount that better reflects what home values actually look like across the country today. The second is indexing the exclusion to inflation going forward, which would mean the thresholds adjust automatically over time rather than remaining static until Congress acts again decades from now.

Both proposals are tied to the same underlying argument about housing supply. If long-term owners feel more financially comfortable with the outcome of selling, more homes enter the market and more buyers have access to inventory they currently cannot find. Whether the effect on supply would be large enough to meaningfully shift market conditions is debated among economists, with some arguing that most sellers already fall under current thresholds and would not be directly affected. Others believe the barrier is real and significant enough in high-appreciation markets to genuinely influence seller behavior at scale.

What is not in question is that the conversation is happening seriously enough and loudly enough that long-term homeowners with substantial equity should be paying close attention even without any final legislation in place.

The Mistakes That Are Costing Long-Term Sellers Real Money

Regardless of what Congress ultimately decides, there are actions long-term homeowners can take today that directly affect how much of their gain they keep when they eventually sell. The most consistently overlooked involves documentation of capital improvements made throughout the years of ownership.

Significant upgrades including room additions, major renovations, roof replacements, new HVAC systems, and other substantial improvements can all be added to your cost basis. A higher cost basis means a smaller taxable gain at sale. Without records to support those additions the financial benefit disappears entirely at tax time and you pay taxes on gains that your own investment should have offset.

Timing also matters more than most sellers realize. The calendar year in which a sale closes, your overall income picture for that year, and how the proceeds interact with other financial activity can all affect what you ultimately owe. These variables can sometimes be managed thoughtfully but only when planning begins well before a contract is signed and options have narrowed.

As John Cobain points out, the sellers who come through this process in the strongest financial position are almost always the ones who started the conversation with both a tax advisor and a knowledgeable loan officer at least a year before they were ready to list, not in the final weeks after going under contract when the decisions that mattered most have already been made.

What You Should Do Before the Rules or the Market Shifts

You do not need to wait for Washington to act before getting your own situation in order. If you are a long-term homeowner with significant equity and a move somewhere in your one to three year planning horizon, taking stock of your position now puts you in a far stronger place regardless of what ultimately happens with the exclusion thresholds.

Start by gathering documentation of your original purchase price and any improvements made since buying. Have a preliminary conversation with a tax professional to estimate your potential gain under current law and understand what your exposure looks like. And connect with a loan officer who can help you think through how a sale fits into your broader financial picture and what your options look like on the other side of the transaction.

John Cobain works with long-term homeowners to build clarity and a real plan before decisions need to be made under pressure or on a compressed timeline. Reach out to John Cobain to get ahead of the conversation before the market or the tax code shifts around you.

Sources

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