Proposals to impose a tax on the net worth of wealthy Americans have become a recurring theme of the tax policy debate at both the federal and state levels. Supporters promise that a wealth tax would raise substantial revenues and reduce inequality.
In practice, however, wealth taxes discourage investment and entrepreneurship, are difficult to administer, often assess taxes on illusory gains, and raise serious constitutional concerns. In addition, experience from European countries that have since abandoned wealth taxes shows that they collect less revenue than promised.
What Is a Wealth Tax?
Income, sales, capital gains, and transfer taxes generally apply when someone earns income, buys something, sells an appreciated asset, or transfers property—in other words, when someone receives money that can be directly used to purchase something else. A wealth tax instead applies annually to a taxpayer’s net worth—the value of assets minus debts.
For example, a taxpayer with $100 million in taxable net worth would owe $2 million under a 2% wealth tax, even without selling an asset or realizing any income.
A more limited (but still extremely administratively complex) form of wealth tax is a tax on unrealized capital gains, sometimes referred to as “mark-to-market.” Rather than being assessed on the entirety of an individual’s wealth as a wealth tax would be, a mark-to-market system of capital gains taxation would tax capital gains regardless of whether they are realized or unrealized. NTUF explains the difference in its analysis of a proposed “Billionaires Tax.”
Determining a Taxpayer’s Net Worth Creates Administrative and Enforcement Problems
While it is easy to determine the value of a publicly traded stock, it is much more difficult to determine the value of private businesses, artwork, real estate, and other illiquid assets. Administering a wealth tax would require extensive appraisals, reporting, audits, and litigation as taxpayers and tax authorities disputed the value of assets. It could also encourage taxpayers to shift money from transparent investments into assets that are harder to value.
Wealth on Paper Does Not Pay Tax Bills
Net worth is not the same as cash on hand. An entrepreneur may be wealthy on paper because a business has grown in value while receiving little cash from it. For many founders, the bulk of their wealth exists as ownership in the business they created.
A wealth tax could force business owners to take on debt or sell shares in the companies they created to pay the tax. The resulting impact would be a decrease in the willingness to assume risk and an increase in corporate consolidation. NTUF examines these consequences in Wealth Taxes and Their Impact on Entrepreneurs.
Taxpayers Respond to Incentives—and Disincentives
Those who are subject to a wealth tax will have strong incentives to restructure their finances, shift assets into hard-to-value holdings, or relocate. Because projected revenues would depend on a relatively small number of wealthy taxpayers, tax avoidance or relocation could quickly erode collections. This dries up significant sources of capital in those areas and future tax revenue that would have come from those taxpayers.
Many European countries abandoned their net wealth taxes after experiencing capital flight, administrative problems, and lower-than-expected revenues. France repealed its wealth tax after the policy contributed to the departure of wealthy residents and the loss of other tax revenue, as NTUF has explained. This is a problem for federal-level wealth taxes, but even more of an issue for proposed state-level wealth taxes.
Is a Wealth Tax Constitutional?
The Constitution generally requires “direct taxes” to be apportioned among the states according to population. The Sixteenth Amendment permits an unapportioned tax on income, but ownership of wealth is not necessarily income.
Legal scholars disagree about whether a federal wealth tax would survive this requirement. Any enacted tax would almost certainly face lengthy litigation. NTUF outlines the constitutional arguments in Is a Wealth Tax Constitutional?
The Promises vs. the Reality
Wealth tax proponents promise to raise large revenues from a very small group of taxpayers. But valuation disputes, liquidity problems, avoidance, capital flight, and reduced investment make that promise difficult to fulfill.
Policymakers should judge wealth taxes by their real-world consequences, not by rosy projections of how much revenue they would raise.
Read More:
DC’s “Wealth Tax” Isn’t a Wealth Tax and Doesn’t Only Tax the Wealthy (June 2026)
Analysis of 2026 Tax Proposals from Senators Sanders, Warren, Booker, and Van Hollen (April 2026)
Another Unworkable Wealth Tax Proposal Goes Global (August 2024)
How Congress Can Address “Buy Borrow Die” (March 2024)
President Biden Proposed Yet Another Unworkable Wealth Tax (February 2023)
Crypto Plunge Exposes the Folly of Taxing Unrealized Gains (May 2022)
Analysis of Proposed “Billionaires Tax” (October 2021)
Is a Wealth Tax Constitutional? (October 2021)
Wealth Taxes and Their Impact on Entrepreneurs (January 2020)
The Wealth Tax's Impact on Private Charities (December 2019)