The appeal of a wealth tax is visceral and immediate. As billionaire fortunes compound at unprecedented rates—especially in sectors like artificial intelligence—voters crave a direct remedy. California's November ballot initiative proposing a 5% levy on fortunes exceeding $1 billion captures this frustration. The political momentum behind such measures is real, and the grievance fueling them is legitimate: the wealthiest Americans have significantly reduced their effective tax burdens over the past two decades, exacerbating inequality that most Americans recognize as problematic.
Yet between the intuitive appeal of a new wealth tax and effective tax policy lies a consequential gap—one policymakers would be wise to reckon with before betting political capital on untested mechanisms.
The case for urgency is straightforward. Federal revenues need bolstering for multiple reasons: aging demographics will strain social programs, income inequality has widened to levels not seen since the Gilded Age, and shifting economic structures toward asset-based rather than wage-based income have eroded the traditional tax base. The richest 1% paid roughly 31.5% of their income in federal taxes in 2024, down from over 39% at the turn of the century. On a $3 trillion annual adjusted gross income base for that cohort, even a single percentage point represents meaningful revenue potential.
But the global policy record on wealth taxes offers a cautionary tale. In 1990, twelve OECD nations collected revenue from recurrent wealth taxes on net assets. By 2024, only three remained—Norway, Spain and Switzerland—and even they generated minimal revenue relative to GDP. France, Sweden, Belgium and Austria all abandoned their wealth taxes after discovering they generated far less money than projected while creating compliance and administration headaches.
Valuing volatile or illiquid assets—private businesses, real estate held in complex structures, intellectual property—presents genuine technical challenges. A business owner facing a wealth tax bill but lacking liquid capital must either sell assets at unfavorable terms or relocate to a jurisdiction with friendlier rules. The economic literature documents that wealth taxes tend to encourage capital flight, discourage entrepreneurship particularly among business founders, and disproportionately burden those with lower-returning, safer investments.
An OECD analysis concluded that "from both an efficiency and equity perspective, there are limited arguments for having a net wealth tax in addition to broad-based personal capital income taxes and well-designed inheritance and gift taxes." That assessment reflects decades of cross-national experience.
The paradox is that the United States has tax mechanisms already in place—proven, tested and requiring only restoration rather than invention—that could accomplish the distributional goals wealth tax proponents seek, likely with far greater revenue yield and fewer distortions.
Consider the estate tax. In 1972, 6.5% of decedents' estates paid any federal tax. By 2021, that share had collapsed to less than 0.1%, while the revenue generated dropped from 0.4% to 0.08% of GDP. This deterioration occurred despite massive wealth accumulation during the interval. Successive exemptions raised and rates lowered, particularly through the 2017 Tax Cuts and Jobs Act, were culprits. Restoring the estate tax to its pre-2000 configuration—raising rates, lowering exemptions and eliminating or limiting the step-up basis that erases unrealized capital gains at death—would generate substantial revenue while addressing dynastic wealth concentration directly.
Capital gains taxation offers another lever. The top rate of 20% creates a perverse incentive for high earners to reclassify wages as investment returns. Bringing that rate closer to the 37% top marginal rate on ordinary income would improve both equity and economic efficiency by eliminating the artificial advantage of investment income. Similarly, the corporate tax rate, slashed from 35% to 21% in 2017, remains below historical norms and below rates in comparable OECD nations. Modest increases would broaden the base without incurring the economic penalties documented for wealth taxes.
Then there is the tax gap itself—revenue owed but not collected. An IRS-based study estimated that closing this gap entirely would yield $7.5 trillion over the decade 2020-2029. The agency's chronic underfunding has allowed sophisticated taxpayers to exploit ambiguities and complex structures with minimal audit risk. Investing in enforcement capacity is unglamorous compared to wealth tax rhetoric, but the revenue potential dwarfs most alternative proposals.
Building consensus for substantive tax reform requires bridging deep disagreement about government's proper scope and taxing authority. Yet that difficulty is precisely why squandering political capital on a novel mechanism likely to underperform and face international implementation challenges would be unwise. Wealth taxes have been tried across the developed world and largely abandoned—not because policymakers lacked imagination, but because they proved technically vexing, revenue-poor and economically counterproductive relative to alternatives.
The ingredients for a more capable, more progressive tax system already exist in American law. They require not reinvention but restoration and repair. Closing loopholes in existing structures, raising rates on assets and transfers that enjoy preferential treatment and enforcing obligations already on the books would accomplish legitimate distributional goals while maintaining economic efficiency. These paths are neither flashy nor novel. But they have the decisive advantage of evidence suggesting they work—something wealth taxes, at least in the modern global context, decidedly do not.
