In April 2026, the European Commission’s Directorate-General for Taxation and Customs Union quietly published one of the most consequential fiscal documents in recent memory: a two-volume study entitled Wealth Taxation, Including Net Wealth, Capital and Exit Taxes. Commissioned in 2024 and prepared by a consortium of economic research institutions including CASE, WIFO, PwC, and the ifo Institute, the report maps wealth-related tax regimes across EU member states and beyond, and openly advocates for greater use of wealth taxes to address inequality and fund European welfare states. It deserves far more scrutiny than it has received.
A Study Born from Crisis and Concentration
The report does not shy away from its political context. Its authors acknowledge that it was written against the backdrop of “rising concern about the distribution of wealth in Europe, the erosion of taxes on wealth and wealth transfers over recent decades, and renewed fiscal needs in the wake of multiple crises.” That is a remarkably candid admission for a document produced by a bureaucratic body that typically favours the language of technical neutrality.
The factual premise is not without merit. Over the past three decades, private wealth in the EU has grown substantially and has become more concentrated among households at the top of the wealth distribution. The report describes wealth concentration as “a structural feature of the European economic landscape,” raising questions about how existing tax frameworks can adequately respond to this shift. These are legitimate observations. The problem lies not in identifying the trend but in the conclusions drawn from it.
The study was also developed in the context of international discussions at the OECD, G20, and the United Nations — bodies that have increasingly championed progressive wealth taxation as a global policy norm. This international framing is not incidental. It signals that the Commission is not merely conducting academic research; it is positioning itself to participate in a coordinated global push to establish new norms around taxing private wealth, and to pre-legitimise whatever legislative proposals may follow.
Five Categories of Taxation Under the Microscope
The first volume of the study examines five categories of wealth-related taxes: net wealth taxes (recurring levies on total asset holdings minus liabilities), recurrent capital gains taxes on unrealised gains, non-recurrent capital gains taxes on realised gains, inheritance and gift taxes, and exit taxes — levies designed to capture wealth before individuals or businesses relocate outside a jurisdiction. Each category is assessed for its economic rationale, design features, behavioural responses, and revenue performance.
This taxonomy is significant. Net wealth taxes are the most politically charged, having been abolished in most European countries over the past three decades — France, Germany, Sweden, and Austria all scrapped them, often after discovering they distorted investment, triggered capital outflows, and generated less revenue than anticipated. The Commission’s decision to revisit all five categories simultaneously suggests a comprehensive reconsideration of the tax architecture surrounding wealth, rather than a narrow technical adjustment.
The second volume draws on case studies from four EU member states — Austria, France, Germany, and Spain — as well as three non-EU countries: Norway, Switzerland, and Colombia. The inclusion of Colombia is noteworthy: Colombia reintroduced a wealth tax in recent years as part of an overtly redistributive political agenda, and its experience has been mixed. Norway’s net wealth tax, meanwhile, has triggered a visible exodus of wealthy individuals to Switzerland, a phenomenon the study acknowledges but declines to treat as decisively cautionary.
The Revenue Disappointment No One Wants to Talk About
Perhaps the most revealing finding in the study — and the one most likely to be buried in the policy discourse — is that wealth taxes have historically failed as significant revenue instruments. The authors acknowledge plainly that “the wealth taxes examined have not been a major source of revenue.” They attribute this underperformance to tax reliefs, exemptions, and inadequate compliance, collectively described as “tax gaps.”
This is a striking concession. If existing wealth taxes — many of which were introduced with considerable fanfare — have failed to generate meaningful revenue, what exactly is the justification for expanding them? The report’s answer is essentially circular: the taxes did not work because they were poorly designed, therefore better-designed taxes would work. The argument is internally coherent but empirically unverified. There are no examples in the study of a well-designed net wealth tax that has both generated substantial revenue and avoided significant behavioural distortions over a sustained period.
The Commission’s proposed remedy is equally revealing: it recommends the periodic publication of tax gaps as a mechanism to incentivise voluntary compliance. This is a transparency measure, not a structural fix. It assumes that wealthy individuals are largely failing to comply through ignorance or inertia, rather than through deliberate and legal tax planning. The evidence from France’s experience with the ISF (Impôt de Solidarité sur la Fortune), abolished in 2017, suggests the opposite: sophisticated taxpayers adapt rapidly, legally, and often by relocating.
The Exit Tax Question: Trapping Capital Inside Europe
Of all the taxes examined in the study, exit taxes deserve the most critical attention — and the most public debate. Exit taxes are levies imposed on individuals or corporations that transfer their tax residence, assets, or business activities outside a jurisdiction. The logic is straightforward: if you want to leave, you must first pay a toll on the wealth you are taking with you.
The report examines exit taxes with a tone of relative neutrality, but their political implications are anything but neutral. Exit taxes represent a fundamental shift in the relationship between the state and the taxpaying individual: rather than taxing the productive use of wealth within a jurisdiction, they tax the decision to leave it. This is, at its core, a mechanism to reduce mobility — to make it more expensive and more complicated for capital and people to move.
Critics of exit taxes argue — with considerable force — that they are incompatible with the principles of economic freedom and the free movement of capital that underpin the European single market. The European Court of Justice has repeatedly restricted the ability of member states to impose punitive exit taxes on intra-EU relocations, precisely because such taxes conflict with treaty freedoms. The Commission’s study navigates around this tension rather than resolving it, noting the importance of “international cooperation” and “exchange of information” without addressing the fundamental contradiction between exit taxes and European economic liberty.
There is also a practical concern that the study downplays: exit taxes tend to accelerate the very behaviour they are designed to prevent. When wealthy individuals perceive that the cost of leaving is rising, they typically accelerate their departure, front-running the tax before it can be fully implemented. France observed this dynamic before abolishing its wealth tax. Norway is observing it now. The study acknowledges “some evidence” of mobility effects but characterises the international evidence as “limited,” particularly for ultra-high-net-worth individuals. This framing is convenient but questionable: the absence of comprehensive data does not mean the effects are absent, and waiting for more data while designing new taxes is itself a policy choice with consequences.
The Equity-Efficiency Trade-off: Less Settled Than the Report Suggests
One of the study’s central arguments is that the traditional equity-efficiency trade-off — the idea that redistributive taxes necessarily harm economic growth and investment — is “less pronounced than often assumed.” The authors contend that negative effects on savings, investment, and entrepreneurship are “generally modest,” and that well-designed wealth taxes may even support more productive use of assets and higher labour supply.
This is a bold claim, and the evidence base for it is thinner than the confident presentation suggests. The academic literature on wealth taxes is genuinely contested. There are studies that find modest negative effects on investment and capital formation, and there are studies that find more substantial ones. The report draws selectively on findings that support its preferred conclusion, while acknowledging in passing that tax design and taxpayer responses matter enormously. But “matters enormously” is precisely the problem: if effectiveness depends entirely on design features that have proven politically difficult to implement — broad bases, minimal exemptions, consistent valuation, robust anti-avoidance rules — then the theoretical promise of well-designed wealth taxes remains largely theoretical.
The valuation problem alone is severe and systematically underweighted in the report. Liquid financial assets such as publicly traded shares can be valued straightforwardly. But the majority of wealth held by high-net-worth individuals is illiquid: private businesses, real estate, art, and other assets that lack observable market prices. Valuing such assets for tax purposes requires either complex and expensive administrative machinery or the use of proxies that introduce significant inaccuracies and distortions. The study acknowledges this problem under the heading of “institutional and international factors” but treats it as a solvable administrative challenge rather than a fundamental obstacle.
The Institutional Fantasy: Digitalisation and Information Exchange as Silver Bullets
The report places enormous weight on what it calls “institutional factors” — third-party reporting, the digitalisation of tax administrations, and international exchange of information on beneficial owners, real estate, and asset registration. These are presented as preconditions for effective wealth taxation, and the study argues that advances in these areas make wealth taxes more feasible now than they were when most European countries abandoned them.
This argument has some merit: administrative capacity has genuinely improved, and initiatives such as the Common Reporting Standard and the EU’s Directive on Administrative Cooperation (DAC) have enhanced cross-border information sharing. But the argument also contains a significant leap of faith. Knowing that a wealthy individual owns a stake in a private company does not straightforwardly resolve the valuation problem. Knowing that someone holds foreign assets does not eliminate the capacity or incentive for sophisticated tax planning. And building the administrative infrastructure required to assess, collect, and enforce annual taxes on net wealth across diverse asset classes is an enormously complex and expensive undertaking — one that the study treats as largely a matter of political will and digital investment.
Furthermore, the emphasis on beneficial ownership registries and asset registration databases raises legitimate concerns about privacy and data security that the study does not adequately address. The creation of comprehensive government records of private wealth holdings is not a trivial civil liberties matter, and the history of data breaches and misuse of financial information by public authorities across Europe suggests that these risks deserve more than a footnote.
Political Feasibility and the Transparency Argument
Perhaps the most telling section of the study is its treatment of political feasibility. The authors concede that wealth taxes face significant political headwinds and argue that their implementation requires “clear communication about who is affected, how revenues are used and how measures fit into a broader fairness strategy.” In other words: wealth taxes are politically difficult, but they can be made more palatable through better public relations.
This framing reveals the ideological underpinnings of the entire project. The study does not seriously engage with the possibility that political opposition to wealth taxes reflects legitimate concerns about economic efficiency, individual liberty, or the historical failure of such instruments. Instead, opposition is treated as a communication problem — a failure of voters and citizens to understand what is good for them, rather than a substantive disagreement about the proper limits of state power over private wealth.
The report is candid that it aims to serve as a guide for Brussels’ future tax policies. One of its lead researchers described the context memorably: “First we had millionaires, then billionaires, and now we are talking about ultra-millionaires.” The implication is clear: the concentration of wealth at the top is so extreme that new instruments are required to address it. Whether those instruments will work as intended — or whether they will trigger the familiar cycle of evasion, exodus, and eventual abandonment — is a question the study never fully resolves.
The Broader Context: A Fiscal Union Through the Back Door
It would be a mistake to view this study in isolation. It arrives at a moment when the European Commission is actively seeking new sources of revenue to fund an expanding agenda — from defence spending to the green transition to the repayment of NextGenerationEU debt. The Commission has long harboured ambitions to develop EU-level taxation beyond customs duties and import levies, and wealth taxation represents an attractive frontier: politically popular in many quarters, technically complex enough to require expert guidance, and sufficiently novel to circumvent the distributive politics of existing national tax systems.
The study stops short of explicitly calling for EU-level wealth taxes, but its emphasis on harmonisation, information exchange, and the avoidance of “distortive competition between member states” points in that direction. If member states cannot individually sustain effective wealth taxes because wealthy individuals simply move to lower-tax jurisdictions within the EU, the logic of the study leads inexorably toward some form of minimum harmonisation at the European level. The Commission is laying the intellectual groundwork now.
Conclusion: A Flawed but Consequential Document
The Commission’s wealth taxation study is a serious piece of work, drawing on substantial academic literature and detailed country case studies. It is not propaganda. But it is advocacy — careful, technically sophisticated advocacy for a particular fiscal direction — dressed in the language of neutral analysis. Its conclusions are consistently optimistic about the potential of wealth taxes and consistently minimising of their historical failures and practical obstacles.
The study’s admission that existing wealth taxes have “not been a major source of revenue” should give pause to any honest reader. If the instrument has consistently underperformed, the burden of proof lies with those who argue that a better-designed version will succeed where previous iterations have failed. That burden is not convincingly discharged in this report.
What the report does succeed in doing is setting the agenda. In Brussels, as in most policy environments, the power to define the question is often more consequential than the power to answer it. By framing wealth concentration as a “structural problem” that existing tax frameworks are ill-equipped to address, and by systematically documenting the design features that could theoretically make wealth taxes work better, the Commission has moved the European policy debate in a clear direction. The political will to follow is another matter — but the intellectual scaffolding is now in place.
Citizens, businesses, and governments across the EU would do well to engage with this study critically, not passively. The decisions that flow from it — if they flow at all — will shape the fiscal landscape of Europe for a generation.
Sources: European Commission, Directorate-General for Taxation and Customs Union, “Wealth Taxation, Including Net Wealth, Capital and Exit Taxes” (Volumes 1 and 2), April 2026. Prepared by CASE, WIFO, PwC, IEB, ifo Institute, and VATT.
