A wealth tax applies to the value of a person’s net assets; income tax applies to taxable income; and capital-gains tax applies to increases in asset value, often when an asset is sold. The distinction is mainly what is taxed and when—not simply the rate. Exact rules, exemptions, and timing depend on the country.
What each tax applies to
| Tax | What it taxes | Typical timing |
|---|---|---|
| Recurrent net-wealth tax | The value of included assets minus eligible liabilities | Periodically, based on ownership and valuation at a specified time |
| Income tax | Taxable income flows, such as wages or investment income | As income is received or otherwise recognized under the applicable rules |
| Capital-gains tax | An increase in an asset’s value | Often when the asset is sold and the gain is realized |
These are broad categories rather than universal legal definitions. Countries set their own rules for which assets and liabilities count, how value is determined, and what deductions, thresholds, or exemptions apply.
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Why a wealth tax can be due without income or a sale
A net-wealth tax is based on the asset base, not on the cash it produces. It can therefore apply to assets that generate no income, and may be due even if their owner has not sold them. The OECD notes that such taxes can apply independently of actual returns.
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That makes a wealth tax different from a tax on investment income, which follows taxable returns, and from a capital-gains tax using realization rules, which generally follows appreciation when it is realized. A wealth tax is not simply another name for a tax on unrealized gains: the former can apply to the value of the net asset base, while the latter targets appreciation and may use a different timing rule.
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Why the headline rates are not directly comparable
A percentage rate has meaning only alongside its tax base. The OECD’s 2018 report illustrates this with a person holding €10 million in net wealth and earning a 4% return. That return is €400,000: a 30% tax on the capital income would be €120,000, as would a 1.2% tax on the €10 million wealth stock.
The equality depends on the assumed 4% return. At a 5% return, the same 30% capital-income tax would be €150,000, while the 1.2% wealth tax would remain €120,000. If returns were low or negative while asset values remained positive, a wealth-tax bill could still arise even when tax on current capital income was small or zero. These are illustrative calculations from the OECD, not estimates of anyone’s liability under a particular country’s law.
How timing changes the comparison
Periodic taxation of a stock
A wealth tax assessed using current valuations can reflect changes in asset values through periodic taxation of the asset stock. Its liability does not necessarily wait for an asset to produce income or be sold.
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Under a realization-based capital-gains tax, tax is commonly triggered by a sale. This can defer tax while an owner continues to hold an appreciated asset. The OECD discusses this potential lock-in effect, as well as the practical challenge of keeping asset valuations current for accrual-based taxation. These are design tendencies, not rules that apply identically in every jurisdiction.
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What determines the policy case for a wealth tax
The case for a recurrent individual net-wealth tax depends partly on what other taxes are in place. In its 2018 assessment, the OECD found limited arguments for adding one on top of broad-based personal capital-income taxes and well-designed inheritance and gift taxes. It saw a stronger substitution role where taxes on capital income or wealth transfers are limited or infeasible. This is the OECD’s policy assessment, not a settled consensus or a statement of any country’s current law.
The OECD’s historical counts also show why dates matter: its 2018 report recorded recurrent individual net-wealth taxes in 12 OECD countries in 1990 and in four OECD countries in 2017. Those figures describe past years, not the current country count.
How to compare two countries’ tax systems
For a country-specific comparison, check the applicable current law or tax authority guidance. Compare these features rather than relying on the labels or headline rates:
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- Tax base: net assets, income flows, or realized appreciation.
- Timing: periodic ownership, receipt or recognition of income, or sale of an asset.
- Coverage: which assets and liabilities are included.
- Valuation: how and how often assets are valued.
- Thresholds and relief: rates, exemptions, deductions, and minimum thresholds.
- Interaction with other taxes: treatment alongside capital-income, capital-gains, inheritance, and gift taxes.
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