The Long History of Wealth Taxes and Why They Always Fail

In 1991, Sweden — a country not generally suspected of hostility toward taxation — abolished its wealth tax after fifty years of operation. The decision was not made reluctantly. Swedish economists and policymakers had concluded that the tax had become so counterproductive that removing it was urgent. The country’s wealthiest families had been moving capital offshore for decades. The tax raised trivially small revenues relative to the distortions it created. Several of Sweden’s most productive entrepreneurs and business families had emigrated entirely, taking their companies and their future tax contributions with them. Ingvar Kamprad, the founder of IKEA, had moved to Switzerland in 1973. He returned to Sweden in 2014 — the year after the last vestiges of the wealth tax were dismantled. He had been gone for forty-one years. The Swedish experience is the canonical case study in what happens when a wealth tax encounters the real world, and it has been mostly ignored by every subsequent generation that has proposed wealth taxes as the obvious solution to economic inequality.

The political appeal of wealth taxes is real and not stupid. Wealth is more concentrated than income. The richest households pay lower effective tax rates than the merely affluent, partly because returns to capital are taxed at lower rates than labor income, and partly because sophisticated tax planning and the illiquidity of many asset classes makes avoidance straightforward. A direct tax on wealth stocks rather than income flows would, in principle, address both problems: it would hit unrealized capital gains and it would apply regardless of whether the wealthy manage to avoid recognizing income in any given year. The logic is clean. The history is discouraging.

The Valuation Problem That Never Gets Solved

The first problem with a wealth tax is that most wealth does not have an easily determined market value. Listed equities are priced daily. Cash, obviously, has a known value. But private businesses — which make up a large fraction of the wealth held by genuinely wealthy families and entrepreneurs — have no market price until someone buys them. Real estate has an estimated value that may bear little relationship to what it would actually sell for. Art, jewelry, collectibles, intellectual property, closely held partnership interests, agricultural land, and a dozen other asset classes are all difficult to value with any precision.

This is not a trivial administrative inconvenience. It is a structural problem that creates systematic injustice and systematic gaming. If you tax private business equity at assessed value, you create an incentive to understate that value — which wealthy taxpayers with sophisticated advisors will do, and which creates a perpetual cat-and-mouse between taxpayers and tax authorities over valuations that neither party can determine objectively. If you tax private businesses at their eventual sale price, you have deferred the tax in a way that largely defeats its purpose. If you require annual mark-to-market valuations of private assets, you have created an enormous compliance burden and a cottage industry of appraisers who can be incentivized to produce whatever valuation their clients want.

Norway has operated a wealth tax since the postwar era and has struggled with the private business valuation problem consistently. For most of its history, Norwegian private businesses were assessed at a discount to listed equity values, which created an incentive for wealthy families to hold wealth in private rather than public form — exactly the opposite of what good capital allocation policy would want. When Norway tightened the valuation rules in 2022 to equalize treatment of private and public equity, a wave of wealthy business owners announced they were relocating to Switzerland, which has lower wealth tax rates and more favorable valuation rules. The emigration wave was large enough that the Norwegian government was forced to introduce an exit tax to claw back some of the tax base it was losing. Whether the exit tax will survive legal challenge in the European context remains uncertain.

The liquidity problem compounds the valuation problem. A wealth tax creates an annual cash obligation. For most of the genuinely wealthy, the bulk of their wealth is illiquid — tied up in business ownership, real estate, or other assets that cannot be easily sold in small pieces. The tax therefore requires either that wealthy people maintain large liquid reserves (which means keeping wealth in low-return liquid form rather than high-return productive investments) or that they regularly sell portions of their illiquid assets to pay the tax bill. Forced partial sales of business equity can be deeply disruptive to the management of ongoing businesses and may reduce economic efficiency in ways that cost more in foregone growth than the tax raises in revenue.

The Capital Flight That Always Happens

France’s experience with the Impôt de Solidarité sur la Fortune, or ISF, ran from 1989 to 2017 with a brief interruption in the mid-1980s. Over that period, it collected an average of roughly 0.25 percent of GDP annually — a modest sum. Conservative estimates suggest it drove around 10,000 high-net-worth individuals out of France over the years of its operation, including business founders and investors who took their companies and investment capital with them. Gabriel Zucman and Thomas Piketty, who are generally sympathetic to wealth taxes, have argued that the French wealth tax was poorly designed and that a better-designed version would have reduced emigration. They may be right that design matters. But the emigration happened under the actual tax, not the theoretical better version, and the revenue losses from that emigration likely exceeded the tax’s total annual yield.

Capital flight in response to wealth taxes is not a right-wing talking point. It is an empirically documented phenomenon that has occurred in every country with a significant wealth tax that has been studied rigorously. The magnitude varies with tax rate, the ease of emigrating, the availability of tax treaties, and the specific design of the tax. But the direction is consistent. Wealthy people and their capital are mobile in ways that wage earners are not, and tax systems that treat them as though they are not mobile will consistently lose tax base over time.

The mobility asymmetry is deepened by the fact that the people most capable of emigrating are often the most economically valuable to remain — successful entrepreneurs, investors with large portfolios of private companies, senior executives with globally portable skills. These are not purely passive rentiers living off inherited land. Many of them are actively creating economic value, and their departure reduces not just the tax base but the productive capacity of the economy. This does not mean they should be exempt from taxation. It means that a tax that causes them to leave is a bad tax even by the standards of pure revenue collection, to say nothing of the economic effects.

Switzerland’s continued existence as a low-tax destination for European wealthy families is not an accident or an anomaly. It is a deliberate competitive strategy that Swiss cantons have pursued consistently for a century, and it has been consistently effective. Until Europe creates a unified tax system with no internal tax competition — which has been a stated goal of European integration for decades and shows no sign of being achieved — countries that impose aggressive wealth taxes will export their tax base to countries that do not. That is not a design flaw. It is a fundamental constraint of operating in an economically integrated world with multiple sovereign tax jurisdictions.

What Wealth Taxes Actually Raise

The empirical record on wealth tax revenues is deflating for advocates. The OECD tracked wealth tax revenues across member countries and found that the peak revenue from net wealth taxes was around 0.5 percent of GDP in a handful of countries. This compares to total tax revenues of 25-45 percent of GDP in OECD countries. Wealth taxes are, in revenue terms, a rounding error. They are not large enough to fund significant public programs. They are not capable of meaningfully redistributing wealth stocks even at rates that are politically very difficult to achieve. Their symbolic importance vastly exceeds their fiscal importance.

This disconnect between political salience and fiscal impact is important. When Elizabeth Warren proposed a two-percent annual wealth tax on fortunes above 50 million dollars in 2019, her campaign estimated it would raise 2.75 trillion dollars over ten years. Independent economists at the University of Pennsylvania’s Wharton School estimated 1.4 trillion. Emmanuel Saez and Gabriel Zucman, who designed the proposal and are sympathetic to its goals, estimated 2.75 trillion assuming 15 percent avoidance — which many economists thought was far too optimistic given the historical record. Larry Summers estimated the tax would raise a fraction of any of these figures once emigration, avoidance, and valuation manipulation were fully accounted for. The range of credible estimates spanned from modest to trivial, and nobody actually knew which was correct because the United States had never implemented such a tax.

The uncertainty itself is a problem. Fiscal planning requires reasonably stable revenue projections. A tax whose yield is highly sensitive to the degree of avoidance, the elasticity of emigration, and the success of enforcement — all of which are deeply uncertain — is a poor candidate for funding large public programs that depend on reliable revenue streams. The progressive case for wealth taxes typically relies on the revenue being used for something valuable: universal childcare, healthcare, higher education, infrastructure. If the revenue is uncertain and likely modest, the case for those programs has to be made independently of the wealth tax, not constructed around it.

The Taxes That Actually Work

There is a significant irony in the fixation on net wealth taxes: there is a much simpler, more robust instrument for taxing accumulated wealth that has a solid historical record of raising significant revenue with fewer of the pathologies described above. Property taxes — which are effectively wealth taxes on real estate — are consistently among the best-performing taxes in revenue stability, economic efficiency, and incidence. Land in particular is an ideal tax base: it cannot emigrate, its value is determined by public investment and community development rather than owner effort, and taxing it creates no distortion of productive activity because the supply of land is fixed.

Many economists who are skeptical of net wealth taxes are enthusiastic about land value taxation, which is essentially a variant of the same principle applied to the least mobile and most publicly created form of wealth. The reason land value taxation is less politically popular than net wealth taxes is straightforward: the primary holders of land are a politically organized and powerful constituency — homeowners — who are not at all the same as the billionaire class that net wealth taxes are typically aimed at. Homeowners vote. They are numerous. They are geographically concentrated in politically important districts. Taxing them is hard in a way that taxing a small number of very wealthy people sounds, at least rhetorically, like it might not be.

Inheritance and estate taxes have a similarly mixed record but fewer of the liquidity and valuation problems of annual wealth taxes — because they are assessed once, at the point of transfer, rather than annually, and because they apply at death when estates are typically liquidated and therefore have known market values. The United States had an estate tax through most of the twentieth century that raised meaningful revenue and shaped intergenerational wealth transmission. Its gradual gutting through increased exemptions and political pressure from organized wealthy interests is a case study in how fiscal policy gets captured — but that is an argument for reforming estate taxes, not for replacing them with an annual wealth tax that has worse practical properties.

The conclusion that emerges from the full historical record is not that wealth should go untaxed or that inequality is acceptable. It is that the specific instrument of an annual net wealth tax is a poor tool for the goals it is supposed to serve. The better tools exist and are known. They are politically harder to implement not because they are technically inferior but because they spread the tax burden more broadly and thereby energize a more formidable coalition of opponents. Sweden understood this by 1991. France understood it by 2017. Norway is learning it now. The question is not whether to tax wealth. The question is which taxes on wealth are actually feasible, raise substantial revenue, and do not drive away the economic activity they are meant to capture. The answer is almost never an annual net wealth tax.