EU Study Finds Wealth Taxes Raise Limited Revenue but Shape Global Debate
A landmark study by the European Commission has found that wealth taxes—including net wealth, capital and exit taxes—generate limited revenue, but remain central to debates on fairness and inequality.
Published by the Directorate-General for Taxation and Customs Union, the report contributes to ongoing discussions in global forums such as the OECD, G20 and the United Nations, where governments are exploring how to tax wealth more effectively in a globalised economy.
What Is the EU Wealth Tax Study About?
The study, commissioned in 2024, provides a comprehensive analysis of wealth taxation in the EU and globally, focusing on:
- Net wealth taxes
- Capital taxes
- Exit taxes
- Inheritance and gift taxes
It is structured into two volumes:
Volume 1: Overview of Wealth Taxation in the EU
- Reviews academic research across EU and non-EU countries
- Maps existing wealth tax systems in EU Member States
- Identifies gaps in evidence and areas for further research
Volume 2: Country Case Studies
The report analyses seven countries:
- EU: Austria, France, Germany, Spain
- Non-EU: Norway, Switzerland, Colombia
These case studies provide real-world insights into how wealth taxes function in practice.
Key Findings: Wealth Taxes Generate Limited Revenue
A central conclusion of the study is that wealth taxes are not a significant source of government revenue.
Several factors explain this:
- Extensive exemptions and tax reliefs
- Compliance challenges
- Weak enforcement mechanisms
The study highlights the existence of tax gaps, meaning the difference between expected and actual tax revenues. It suggests that publishing tax gap data regularly could improve voluntary compliance.
Why Tax Design Matters More Than the Tax Itself
The report emphasises that the effectiveness of wealth taxation depends heavily on its design.
Important factors include:
- Tax thresholds and valuation rules
- Administrative capacity
- Behavioural responses of taxpayers
Well-designed wealth taxes can contribute to:
- Horizontal equity (equal treatment of similar taxpayers)
- Vertical equity (fair distribution across wealth levels)
Mobility of Wealthy Individuals: Evidence Still Limited
A major concern in wealth taxation is whether it encourages wealthy individuals to relocate.
The study finds:
- Some evidence of domestic mobility effects
- Limited evidence regarding international mobility of ultra-high-net-worth individuals
This remains a key research gap, particularly in a highly globalised economy.
Lessons from Countries with Wealth Taxes
The case studies reveal significant differences in how wealth taxes perform:
- France has moved away from broad wealth taxation
- Spain continues to apply a net wealth tax with regional differences
- Norway and Switzerland maintain long-standing systems
- Germany and Austria provide historical context after abolishing such taxes
👉 The conclusion: there is no one-size-fits-all approach to wealth taxation.
Digitalisation and Transparency Are Critical
The study highlights the importance of modern tax infrastructure in improving effectiveness.
Key priorities include:
- Exchange of information on beneficial ownership
- Improved real estate and asset registries
- Stronger third-party reporting
- Increased digitalisation of tax administrations
These tools are essential for reducing tax evasion and improving compliance.
Policy Implications for the EU and Beyond
The European Commission does not recommend a specific policy but provides a technical foundation for informed debate.
Key takeaways:
- Wealth taxes are complex and context-dependent
- Revenue potential is limited without strong enforcement
- International cooperation is crucial
Wealth Taxes Are Not a Silver Bullet
The EU Wealth Tax Study 2026 delivers a clear message:
Wealth taxation can support fairness, but its success depends on design, compliance, and global coordination.
As governments continue to explore ways to address inequality and raise revenue, this study provides critical insights into the real-world impact of net wealth, capital and exit taxes.
FAQs on Wealth Taxation
What is a net wealth tax?
A net wealth tax is a tax on an individual’s total assets minus liabilities.
Why do wealth taxes generate limited revenue?
Due to exemptions, compliance challenges, and tax gaps, wealth taxes often produce modest revenue.
Do wealth taxes cause people to leave a country?
Evidence is limited. Some domestic mobility effects exist, but international relocation impacts are unclear.
Which countries have wealth taxes?
Countries like Spain, Norway and Switzerland currently apply wealth taxes, while others like France have reformed or removed them.