Wealth Taxation Wiki
A wealth tax is a recurrent levy on an individual's net assets, defined as the total market value of owned assets minus liabilities.[^c1] Unlike a property tax, which is limited to real estate, a broad-based net wealth tax applies to most or all types of assets, including financial securities, business equity, cash, and personal property. As of mid-2026, only three European countries — Norway, Spain, and Switzerland — along with Colombia outside Europe, maintain such broad-based net wealth taxes.[^c57] France replaced its broad wealth tax with a real estate-only levy in 2018, and several other countries tax selected asset classes without imposing a true net wealth tax. Within the eurozone, the wealthiest 5 percent of the population controlled 45 percent of net household wealth as of early 2025, while the top 10 percent held 57.4 percent.
The modern debate over wealth taxation has been substantially shaped by the work of Thomas Piketty and Gabriel Zucman, who argue that the tendency of returns on capital to exceed economic growth generates increasing wealth concentration that progressive taxation must counter.[^c2] Piketty's Capital in the Twenty-First Century made the case for a progressive annual tax on capital, arguing that existing tax systems fail to capture the economic capacity of the wealthiest individuals during their lifetimes. Zucman has since developed proposals for an internationally coordinated minimum tax on billionaires, which gained consideration at the G20 level in 2024 and became the subject of negotiations at the United Nations. In May 2026, Zucman published We Need to Tax Billionaires, summarizing the international research quantifying how little tax billionaires pay and presenting the 2 percent minimum tax proposal.[^c58] A special issue of INTERTAX (Vol. 54) was devoted to scholarly analysis of the Zucman proposal, with contributors including Dan Shaviro (NYU), Wolfgang Schön (Max Planck Institute), and Jayati Ghosh covering legal, economic, and administrative dimensions. At the 2026 OECD Ministerial Council Meeting in Paris, the Trade Union Advisory Committee convened a high-level dialogue between Zucman and OECD Secretary-General Mathias Cormann, where Zucman argued that even a modest 2 percent minimum tax on billionaires would raise $200–250 billion annually from around 3,000 individuals.
The historical record of wealth taxes is one of widespread adoption followed by gradual repeal. Over six decades, 14 European countries have imposed a broad tax on personal wealth; most repealed them, citing capital flight, disappointing revenue, high administrative costs, and revenue losses from other taxes.[^c20] The number of OECD countries with net wealth taxes peaked at twelve in the mid-1990s and then declined steadily.[^c3][^c4] Among countries that retained their wealth taxes, revenue ranges from 0.21 percent of GDP in Spain to 1.16 percent in Switzerland. Proponents of wealth taxes argue that previous failures were due to design flaws — excessive exemptions, poor enforcement, and lack of international coordination — rather than inherent defects in the concept. They point to evidence that global billionaires face effective tax rates as low as 0 to 0.5 percent of their wealth, and that a modest 2 percent minimum tax could raise $200 to $250 billion annually from fewer than 3,000 individuals worldwide.[^c5][^c6]
Analysts have described wealth taxes as "experiencing a notable renaissance after decades of decline," driven by rising inequality, post-pandemic fiscal needs, erosion of corporate tax bases, and improved international coordination through initiatives such as the OECD's Common Reporting Standard and the global minimum corporate tax. A potential "Pillar Three" framework is emerging that could include minimum global wealth taxes, harmonized inheritance rules, and anti-tax-nomad measures.
The year 2025–2026 marked a significant intensification of the wealth tax debate. In the European Union, wealth concentration continued to rise: the richest 10 percent held 60 percent of household wealth in 2023, up from 57 percent in 1995, while the top 1 percent increased its share from 22.6 percent to 25.0 percent.[^c22] The European Commission published a major two-volume study in April 2026 examining five types of wealth-related taxes across seven country case studies. The study concluded that net wealth taxes remain rare across member states and that effective regimes depend on high thresholds, broad tax bases, and strong enforcement, while noting that no single approach suits all member states. Analysts at Pictet Asset Management argued that wealth taxes are "almost inevitable" due to AI-driven wealth concentration creating democratic demand for redistribution.
[Switzerland] On 8 March 2026, Swiss voters approved the Federal Act on Individual Taxation (FAIT), ending the aggregation of married couples' wealth for tax purposes. The reform, which applies at federal, cantonal, and municipal levels, provides that married persons will be taxed in the same manner as unmarried persons and is expected to enter into force no earlier than 1 January 2030.[^c55] Switzerland continues to collect the highest wealth tax revenue among OECD countries at 1.16 percent of GDP.
[Spain] The Spanish solidarity tax on large fortunes (ITSGF), originally introduced as a temporary measure in 2022, has solidified into a permanent structural fixture. In Andalucía and Madrid, where regional wealth taxes are bonified at 100 percent, the ITSGF ensures that residents with net wealth above €3 million still pay a minimum tax at progressive rates of 1.7 to 3.5 percent. The October 2025 Spanish Supreme Court rulings extending the 60 percent combined tax cap to non-residents took effect in Q1 2026, reducing wealth tax liability for affected non-residents by up to 40 percent. UK residents post-Brexit cannot access regional bonifications and pay full state-level wealth tax plus ITSGF.
[United Kingdom] In July 2026, incoming UK Prime Minister Andy Burnham declined to rule out introducing a wealth tax, stating that the government "may have to ask for a little more" from the wealthy.[^c43] Burnham's chief strategist Matthew McGregor had previously endorsed a 2 percent annual wealth tax on assets over £10 million targeting the 2,000 richest people, estimated to raise £24 billion for public services. Former Labour leader Neil Kinnock separately proposed a 2 percent annual wealth tax on assets above £10 million, estimated to raise £11 billion per year. The Patriotic Millionaires UK campaign, backed by 120 millionaires including Gary Lineker and Brian Eno, urged Burnham to introduce the tax, with polling showing 80 percent of UK millionaires in support. Their ten-point reform package with Tax Justice UK proposed raising over £50 billion annually through wealth tax, CGT equalisation, and other measures affecting just 22,000 people — 0.03 percent of the population.[^c59] The Institute of Economic Affairs countered that Britain already levies more in wealth and wealth-related taxes as a share of GDP than any other OECD country.[^c25] The Institute for Fiscal Studies argued against an annual wealth tax, stating it "would penalise saving and investment" and require a new administrative apparatus to value private businesses.[^c56] The deVere Group warned the UK could lose 16,000+ millionaires in 2026 due to wealth tax speculation and non-dom regime abolition.[^c50]
[Tunisia] Tunisia introduced a comprehensive net wealth tax through its 2026 Finance Law, extending the tax base from immovable assets only to also include movable property, with rates of 0.5 percent on assets between TND 3–5 million and 1 percent above TND 5 million.[^c42]
[Malaysia] Malaysia formally ruled out a proposed 2 percent wealth tax in July 2026, with the Finance Ministry stating in a parliamentary reply that revenue contributions would be insignificant after exemptions and reliefs, and that enforcement challenges across multiple asset categories made the tax impractical.[^c49] Treasury Secretary-General Datuk Johan Mahmood Merican confirmed the 2 percent dividend tax on income exceeding RM 100,000 serves as a "proxy" for wealth tax. The government instead adopted targeted measures including a capital gains tax on unlisted shares and a dividend tax on income exceeding RM 100,000.
[Morocco and Ecuador] Morocco's government postponed wealth tax plans, citing the need for in-depth studies on feasibility while expanding income tax enforcement. Ecuador enacted two temporary wealth taxes — a 0.9 percent levy on assets over US$1 million in 2016 to fund earthquake reconstruction, and a second temporary tax in 2021 payable in fiscal year 2022 at rates of 1 to 1.5 percent on net worth above US$1 million. The Ecuadorian Constitutional Court upheld the 2021 tax in October 2022 while striking down related provisions, confirming its constitutionality. Ecuador has not enacted a permanent annual wealth tax; as of the 2026 tax year, residents with assets above US$244,160 must file an informative equity statement with no tax due.[^c68]
[France] In July 2026, the Paris administrative court of appeal ordered LVMH chairman Bernard Arnault to pay approximately €22.5 million in back taxes, including €9.5 million under the wealth solidarity tax (ISF) for 2012–2015 and €13 million in social charges for 2010.[^c52] The ruling stemmed from a restructuring that transferred LVMH shares to a Belgian holding company. Separately, three distinct proposals to replace the IFI with a broader wealth tax — the government's CHP, the RN's IFF, and Mattei's unproductive wealth tax — all failed to survive the 2026 budget legislative process. The Finance Bill adopted by the National Assembly on 2 February 2026 maintained the IFI and, in Article 7, introduced a tax on assets not allocated to an operational activity of wealth management.[^c62]
[Norway] Revenue from Norway's net wealth tax reached 0.6 percent of GDP in 2023–2024, with 671,639 taxpayers representing approximately 12 percent of the population.[^c51] The system raises roughly NOK 32 billion annually, just over 1 percent of Norway's total tax revenue.[^c67] From 2022, Norway introduced step changes in primary residence valuation: the first NOK 10 million is valued at 25 percent, amounts above at 70 percent — nearly tripling the taxable value of high-end properties. A new national valuation model using machine learning on housing transaction data was introduced from 2026 to reduce systematic undervaluation. The OECD recommended reducing the wealth tax in favour of stronger immovable property and inheritance taxation.[^c14] A government-appointed expert commission proposed in June 2026 reducing the rate from 1.0–1.1 percent to a range of 0.25–0.75 percent while eliminating valuation discounts, a reform that will be considered by the Storting in 2027.[^c26] The "NOR-WEXIT" phenomenon saw wealthy Norwegians leave at roughly one per week, with 261 emigrants in 2022 and 254 in 2023 — more than double the pre-hike rate.
[Netherlands] The Wet werkelijk rendement box 3 (Actual Return Act) passed the House of Representatives in February 2026 with 93 votes but remained under Senate review as of mid-2026.[^c65] The bill, intended to address the constitutional violation found in the 2021 Christmas Ruling, would introduce a hybrid system taxing actual rather than deemed returns, with a 1 January 2028 target effective date contingent on Senate passage. The Senate held expert hearings in May 2026; Senate passage is widely anticipated because coalition parties hold a majority in the upper chamber. The House passed motions requesting mitigating measures such as a carry-back loss set-off, and the State Secretary committed to a feasibility letter before summer 2026, with any amendment likely to follow the 2027 Tax Plan.[^c66]
[Italy and Belgium] Italy's 2024 Budget Law raised the IVIE rate on foreign real estate from 0.76 percent to 1.06 percent and doubled the IVAFE rate on financial assets in black-list jurisdictions to 0.4 percent. Belgium's Program Law of 30 May 2026 doubled the securities account tax (TSA) from 0.15 percent to 0.30 percent.[^c35]
[Pakistan] Pakistan's FY2026-27 federal budget abolished the 1 percent Capital Value Tax (CVT) on foreign assets held by resident Pakistanis, which had been introduced in 2022 and applied to assets exceeding Rs 100 million.[^c61] The abolition was part of a broader reform budget that also reduced the super tax and provided relief to salaried taxpayers.
[China] China's enforcement of tax on offshore wealth intensified across 2025–2026. In July 2026, the Ministry of Finance announced an immediate crackdown on offshore trusts used by wealthy families to avoid taxation, imposing personal income taxes on gains from assets placed in overseas trusts, with incomes generated from trust assets taxed annually.[^c60] The offshore-trust measures formed part of a broader cross-border enforcement drive: in May 2026, eight Chinese agencies launched a coordinated crackdown on illegal cross-border investment services, and tax authorities in Beijing, Shanghai, and Guangzhou opened probes into wealthy residents' offshore holdings, tracing back as far as 2018.[^c63] Since late 2025, local tax authorities have also been issuing CRS-triggered reminders to individuals to self-report offshore income.[^c64] The overhaul has major implications for Hong Kong, which recently overtook Switzerland as the world's largest hub for offshore wealth, with hundreds of billions of US dollars estimated to be held in trust structures by mainland families.
[United States] California's Proposition 40 — a one-time 5 percent wealth tax on residents with net worth above $1.1 billion — qualified for the November 2026 ballot, with 54 percent of likely voters in favour per a May 2026 PPIC poll. The Hoover Institution estimated the tax would actually lose California $24.7 billion after accounting for billionaire departures and lost revenue from other taxes.[^c53] A similar wealth tax ballot measure in Oregon failed to gather sufficient signatures to make the ballot.[^c54] Governor Gavin Newsom proposed a national minimum tax on individuals worth more than $100 million while simultaneously opposing California's own Proposition 40. Elon Musk became the world's first trillionaire in June 2026 after SpaceX's IPO, prompting immediate renewed calls for wealth taxes from US senators. The Ultra-Millionaire Tax Act of 2026 was reintroduced with an AI-wealth-concentration framing.
[Latin America] Bolivia's Chamber of Deputies rejected a government proposal to repeal the Impuesto a las Grandes Fortunas in February 2026, keeping the tax in force. Venezuela's IGP remains at 0.25 percent with no progressive schedule introduced. Argentina's Impuesto sobre los Bienes Personales reached a non-taxable minimum of ARS 384.7 million for the 2025 period under the Milei reforms, with rates phasing down to a flat 0.25 percent by 2027. Uruguay's progressive rates range from 0.7 percent to 2.75 percent with a minimum threshold of approximately US$166,000. A study commissioned by the Brazilian government from the International Tax Observatory found that a 2 percent minimum tax on fortunes above $100 million in Latin America could generate $24 billion annually and help restore tax progressivity in a region where the top 10 percent controls about 80 percent of total wealth.[^c29] Global millionaire migration reached record levels, with 165,000 projected to relocate in 2026.[^c16]
The central questions in wealth tax design involve trade-offs between breadth and administrability, rates and behavioral responses, national sovereignty and international coordination, and the balance between taxing wealth stocks and income flows. These questions intersect with fundamental debates about inequality, AI-driven wealth concentration, economic growth, property rights, and the role of the state in shaping the distribution of economic resources.