A lot of people look at capital gains taxes and assume there is meaningful money to be found. The intuition is understandable. Large fortunes, significant stock gains, valuable real estate—this feels like the place where the government could raise serious revenue. But the reality is more constrained. Even fairly aggressive changes to the capital gains system tend to raise tens of billions per year, and in more aggressive scenarios perhaps low hundreds of billions—not enough to close deficits running roughly $1.8 to $2 trillion annually. That is real money, but it is also only a small slice of a very large problem.
That does not mean capital gains reform is not worth pursuing. It means it should be approached with clear expectations. This is a tool for improving the tax system and raising incremental revenue, not a solution to the deficit. It is also an area where well-intentioned ideas can produce consequences that are not obvious at first glance.
A Quick Primer: What We Are Actually Taxing
Capital gains taxes apply when someone sells an asset—stocks, a business, or real estate—for more than they paid. If the asset has been held for more than a year, the gain is taxed at a lower rate than ordinary income, with a top federal rate that generally reaches about 23.8% for high earners.
Two features of the system drive most of the behavior around it. First, gains are taxed only when realized. If an investor does not sell, no tax is owed. Second, under current law, when someone dies, many assets receive a “step-up in basis.” That means the asset’s tax basis resets to its current market value. Appreciation that occurred during the original owner’s lifetime may never be taxed at all.
Together, these rules create a strong incentive to hold appreciated assets for as long as possible, and ideally until death.
What “Step-Up in Basis” Actually Means
Consider a simple example. An investor buys stock for $1 million. Over time, it grows to $5 million. If the investor sells during their lifetime, they owe tax on the $4 million gain. At current top rates, that could mean roughly $800,000 to $1 million in taxes.
But if the investor holds the stock until death under current law, the heirs receive a new basis of $5 million. If they sell immediately for $5 million, they owe no capital gains tax on the appreciation that occurred during the original owner’s life. The gain is effectively erased for tax purposes.
Many reform proposals focus on changing this rule. But there are two very different ways to do it, and they often get confused in public debate.
Under a carryover basis system, the heirs inherit the original owner’s basis. In this example, they would inherit the $1 million basis. If they later sell the stock for $5 million, they would owe tax on the $4 million gain. Importantly, no tax is triggered simply because the original owner died. The tax is owed only if and when the heirs eventually sell.
A very different approach is to tax gains at death. Under that system, death itself is treated as a taxable event, almost as though the assets had been sold. In the example above, the estate could owe tax immediately on the $4 million gain, even if the heirs want to continue holding the asset.
That distinction matters enormously when discussing family businesses, farms, or other illiquid assets. For instance, imagine a farm purchased decades ago for $500,000 that is now worth $5 million because land values have risen over time. Under current law, much of that appreciation may never be taxed if the farm is passed to heirs.
Under a carryover basis system, the heirs could continue operating the farm without an immediate tax bill. But if they later sold the property, they would owe tax on the appreciation accumulated during the original owner’s lifetime.
Under a tax-at-death system, however, the estate could face a large immediate tax bill even if the farm itself does not produce enough cash to pay it. In that situation, heirs might need to borrow money, sell part of the land, or in some cases sell the operation entirely to cover the tax.
Supporters of these reforms often note that exemptions, payment plans, and special rules can reduce this problem, and that is true. But the broader issue remains: taxing unrealized gains at death can create liquidity problems for assets that are valuable on paper but do not generate large amounts of cash. This is one reason many reform proposals lean toward carryover basis rather than immediate taxation at death.
Why Investors Delay Selling—Even at “Reasonable” Rates
At first glance, a 20% tax rate does not seem excessive. Many people would consider it reasonable. But the decision investors face is not between paying 20% and paying nothing in a vacuum—it is between paying today or deferring the tax, potentially for decades, and in some cases avoiding it entirely. If an investor sells today, they immediately give up a portion of their gain. If they wait, that money stays invested and continues compounding. Over long periods, the difference becomes substantial. And if there is a chance the gain may disappear through step-up in basis at death, the incentive to delay becomes even stronger.
The issue is therefore not simply whether rates are fair. It is that the structure of the system rewards waiting.
Why Taxing Capital Gains Like Ordinary Income Is More Complicated Than It Sounds
Some proposals go much further and suggest treating capital gains exactly like wages—taxing them at ordinary income rates and, in some versions, taxing unrealized gains at death. On paper, this appears to solve several problems at once. It raises rates, closes the step-up rule, and ensures that gains are taxed at least once. In practice, it introduces tradeoffs. At higher rates—closer to 37–40%—investors have much stronger incentives to delay selling assets. Transactions decline. Capital stays locked in place longer. The amount of taxable gain realized each year shrinks as behavior changes.
There are also broader economic effects. Analyses from organizations such as the Tax Foundation and the Penn Wharton Budget Model suggest that higher taxes on capital income reduce investment over time. That does not typically produce immediate economic collapse, but it can reduce long-term capital formation, productivity growth, wages, and output relative to what they otherwise would have been.
Even the revenue estimates are often misunderstood. While simple static math can imply gains of $150 to $250 billion annually, more realistic estimates after accounting for behavior are often considerably lower. That still represents meaningful revenue, but it is nowhere near enough to close a multi-trillion-dollar fiscal gap. More importantly, taxing capital gains exactly like wages would represent a deeper shift in how the United States encourages long-term investment and risk-taking. Whether that tradeoff is worthwhile is a legitimate debate. But it is more consequential than it first appears.
How U.S. Capital Gains Taxes Compare Internationally
The United States is often described as having unusually low taxes on capital gains, but the reality is more nuanced. At the top end, U.S. federal rates—roughly 20% plus surtaxes—are not dramatically different from rates in countries such as Canada or the United Kingdom once national and local taxes are considered.
The larger difference is how long gains can remain untaxed. In the United States, gains are generally taxed only when assets are sold, and under current law many gains can disappear entirely at death through step-up in basis. Other countries are often less generous on deferral. Canada, for example, generally treats death as a taxable event for capital gains purposes. Other systems ensure that gains are eventually taxed even if they were not realized during life.
The U.S. system therefore places more emphasis on encouraging long-term holding and deferral than many peer countries do.
What Is a 1031 Exchange, and Why Does It Matter?
A 1031 exchange allows real estate investors to sell one investment property and reinvest the proceeds into another similar property without immediately paying capital gains tax. Supporters argue this encourages reinvestment and economic activity. Critics point out that it also allows gains to be deferred repeatedly over decades. Combined with step-up in basis at death, some gains may ultimately never be taxed at all. Limiting or narrowing 1031 exchanges would not solve the deficit, but it is one of the clearer ways to reduce indefinite tax deferral within the current system.
What a Balanced Reform Might Look Like
A practical reform package would likely combine several narrower changes rather than relying on one dramatic shift.
That could include:
- modest increases in top capital gains rates,
- limits on step-up in basis, likely through carryover basis rather than immediate taxation at death,
- tighter treatment of carried interest,
- limits on perpetual 1031 deferrals,
- and improved enforcement around complex shelters and avoidance strategies.
Taken together, these reforms could raise meaningful revenue while reducing some of the distortions built into the current system. But the broader point remains important: even well-designed capital gains reform addresses only a relatively small share of the overall fiscal gap.
The Bottom Line
Capital gains reform is often discussed as though it could play a central role in solving America’s fiscal challenges. The numbers do not support that view. Even aggressive changes would likely raise only a fraction of what would be needed to close persistent deficits approaching $2 trillion annually. That reality should be clear from the beginning.
Some reforms—especially reducing or eliminating step-up in basis—may improve fairness and reduce distortions in the tax code. Others could generate incremental revenue. But proposals that tax gains aggressively at death or treat all gains exactly like wages also introduce meaningful tradeoffs involving investment behavior, economic growth, and illiquid family assets.
What capital gains reform can realistically do is improve the structure of the system, reduce incentives for indefinite tax avoidance through deferral, and raise a modest amount of additional revenue. That makes it worth discussing seriously. It just does not solve the larger fiscal problem.