What Is a Wealth Tax? Rates, Countries, and U.S. Proposals

A wealth tax is an annual tax on the total net value of what a person owns — assets minus debts — above a set exemption threshold. It differs from an income tax because it is charged on accumulated holdings rather than on money earned during the year, and it differs from a property tax because it reaches financial assets, business interests, and personal property, not just real estate. The United States does not impose a federal wealth tax, but several countries do, and proposals to create one have been introduced in Congress. Twelve OECD member countries collected some form of net wealth tax in 1990; most have since repealed theirs.¹

How the Tax Is Calculated

A wealth tax takes a snapshot of net worth on a single valuation date each year and charges a percentage of the amount that exceeds an exemption. The date varies by country: Norway and France use January 1, while Spain uses December 31.² On that date, you add up the fair market value of everything you own, subtract your debts, and the result is your net wealth. If it exceeds the threshold, tax applies to the portion above.

Rates are low next to income tax rates, generally running from a fraction of a percent to around 3.5 percent, but they apply to the full taxable base every year. Because the tax hits what you hold rather than what you earn, it can reach appreciation that has never been subject to income or capital gains tax — stock that has grown in value but has never been sold, for example.

What Counts as an Asset

Coverage varies by country, but the point is to capture full economic worth rather than one category of property. Commonly included:

Real estate: primary homes, second homes, and commercial buildings
Financial assets: bank accounts, stocks, bonds, mutual funds, and cash-value life insurance
Business interests: stakes in private companies, partnerships, and LLCs
Vehicles and luxury items: cars, boats, aircraft, fine art, jewelry, collectibles
Other valuables: patents, trademarks, copyrights, and precious metals

Switzerland’s wealth tax, for example, reaches bank balances, securities, real estate, vehicles, boats, airplanes, art collections, and jewelry.² The breadth is what separates a wealth tax from a U.S. property tax, which in most jurisdictions covers only real estate and sometimes motor vehicles.

Subtracting Debts

Once gross assets are totaled, outstanding debts come off to produce the net figure. Deductible liabilities generally include mortgage balances, business loans, and personal lines of credit. Switzerland allows worldwide debts such as mortgages and loans to be deducted in full, with no cap. Only the net amount above the exemption is taxed.

Valuing everything is the harder half of the exercise. Publicly traded securities have daily prices. Private companies, real estate, artwork, and other illiquid holdings require professional appraisals, which can run from a few thousand dollars for a commercial property to tens of thousands for a complex business.

How It Differs From Other Taxes

The concept is easiest to place next to the taxes most Americans already pay.

Income tax reaches what you earn in the year — wages, interest, dividends, gains on sold assets. A high earner who spends everything owes significant income tax but would owe little under a wealth tax. Someone with a $200 million stock portfolio and no salary owes no income tax but could owe a wealth tax.
Capital gains tax reaches profit when an asset is sold. A wealth tax reaches the current value of assets still held.
Property tax reaches real estate and sometimes vehicles, and ignores financial assets, business stakes, and personal property. The bottom 90 percent of families hold more than half of their net worth in real estate, while the top 1 percent hold about 13 percent in real estate, so property taxes fall proportionally harder on middle-class wealth.
Estate tax fires once, at death, on what is left behind above a large exemption. A wealth tax fires every year above the threshold.

The core distinction is timing and scope. Income and capital gains taxes capture money as it moves. Property tax captures a narrow slice. Estate tax captures everything, but once. A wealth tax captures everything, every year.

Rates and Thresholds in Countries That Have One

Countries that impose wealth taxes exempt a base amount so only larger holdings are affected, and rates are usually progressive.

Norway

Norway’s 2026 wealth tax applies to net wealth above NOK 1.9 million (roughly $175,000). The combined municipal and state rate is 1.0 percent on net wealth between NOK 1.9 million and NOK 21.5 million, and 1.1 percent above NOK 21.5 million. Married couples get double the threshold.³ The base covers real property, bank deposits, shares, and business capital, with valuation discounts for certain categories.

Spain

Spain exempts the first EUR 700,000 of net wealth, plus another EUR 300,000 for a primary home, and applies progressive rates from 0.2 percent up to 3.5 percent on net wealth above roughly EUR 10.7 million. A temporary solidarity tax on large fortunes runs alongside it, targeting net assets above EUR 3 million at rates up to 3.5 percent to reach wealthy residents in regions that reduced or eliminated their own wealth taxes.

Switzerland

Switzerland collects wealth taxes at the cantonal and municipal level rather than federally. Overall maximum rates range from about 0.13 percent to 0.86 percent depending on the canton. Zurich exempts roughly the first CHF 81,000 for single taxpayers and applies rates from 0.05 to 0.30 percent. Geneva offers per-person deductions and charges rates up to about 0.53 percent once supplementary taxes are included.

How Much It Actually Raises

Revenue is modest even where the tax is well established. In 2023, wealth taxes brought in 0.21 percent of GDP in Spain, 0.61 percent in Norway, and 1.16 percent in Switzerland.⁴ Switzerland’s higher share reflects an unusually broad base: nearly every canton imposes the tax, and the thresholds reach a larger share of the population.

The U.S. Situation

No federal wealth tax exists in the United States, and any proposal faces both political and constitutional questions.

Recent Proposals

Senator Elizabeth Warren’s Ultra-Millionaire Tax would impose a 2 percent annual tax on household net worth between $50 million and $1 billion, and a 6 percent annual tax on net worth above $1 billion. Households below $50 million — roughly 99.9 percent of American households — would owe nothing. Backers estimated the tax would raise about $3.75 trillion over ten years.

A separate Billionaire Minimum Income Tax backed during the Biden administration would require taxpayers with net wealth above $100 million to pay at least a 25 percent effective rate on an expanded definition of income that includes unrealized capital gains. That is not technically a wealth tax, but it functions similarly by reaching annual growth in asset values whether or not the owner has received cash. Neither proposal has been enacted.

The Constitutional Question

A federal wealth tax faces a legal barrier that most other countries do not have. Article I, Section 9 of the U.S. Constitution states that “No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census.”⁵ Any “direct tax” must be apportioned among the states by population, so a state with one-twentieth of the country’s population would owe one-twentieth of the total regardless of how much wealth its residents hold.⁶ The Supreme Court has historically treated taxes on property as direct taxes subject to that rule. The Sixteenth Amendment carved out income taxes, but the question for a wealth tax is whether it can be structured as an income tax at all.

In Moore v. United States (2024), the Supreme Court upheld a one-time tax on undistributed foreign corporate earnings attributed to American shareholders, but explicitly declined to resolve whether income must be realized through a sale before it can be taxed without apportionment.⁷ The majority stressed that its holding was narrow and “was not addressing tax questions involving wealth or net worth.” Any enacted U.S. wealth tax would almost certainly draw an immediate constitutional challenge.

Why the Tax Is Contested

The number of OECD countries with a net wealth tax fell from twelve in 1990 to four by 2017. France, Sweden, and the Netherlands all repealed theirs. The OECD has said those decisions were “often justified by efficiency and administrative concerns,” including enforcement costs that were high relative to revenue.¹ Three practical problems come up repeatedly.

Capital flight. Before France repealed its wealth tax in 2018, an estimated 10,000 people holding roughly EUR 35 billion in assets left the country over the preceding 15 years.

Revenue shortfalls. Wealth taxes across Europe typically raised about 0.2 percent of GDP. Spain’s 2023 solidarity tax on large fortunes brought in just 40 percent of the projected revenue.⁴

Valuation and liquidity. Much of the wealth held by the very rich sits in private businesses, real estate, and art, none of which has a daily market price. Annual appraisals are expensive and disputes are common. A commercial property appraisal runs several thousand dollars; a certified business valuation can range from a few thousand to well over $25,000. The bill also has to be paid in cash, which can force taxpayers to sell assets or borrow to cover a tax on holdings that produced no income during the year. Critics argue this is especially hard on entrepreneurs whose net worth exists almost entirely on paper.

Avoidance is the other constant. Wealth is more mobile than income, and moving assets abroad, restructuring ownership through trusts or holding companies, or underreporting hard-to-appraise assets are all common. Penalties for underreporting or concealment can run from substantial fines to criminal prosecution, but detection is the core challenge.

1
OECD. The Role and Design of Net Wealth Taxes in the OECD
2
Tax Policy Center. What Is a Wealth Tax and How Does It Work?
3
Skatteetaten. Net Wealth Tax and Valuation Discounts
4
Tax Foundation. The High Cost of Wealth Taxes
5
Library of Congress. Article I Section 9
6
Legal Information Institute. Overview of Direct Taxes
7
Supreme Court of the United States. Moore v. United States, No. 22-800