The Dutch House of Representatives has approved legislation introducing a 36% tax on unrealised capital gains, expected to take effect in January 2028, subject to Senate approval. If enacted, the reform will mark a significant departure from traditional capital gains taxation principles. Instead of taxing profits upon realisation (i.e., sale or disposal), the new regime would tax annual increases in the value of certain assets — even if those gains exist only on paper.
This proposal raises important legal, economic and practical questions, not only for Dutch residents, but for investors across Europe and beyond.
From Realised Income to “Paper” Gains
Under conventional tax systems, capital gains tax becomes payable when an asset is sold and a profit is realised. The Dutch proposal would alter that framework by imposing an annual tax on the increase in value of liquid assets such as:
- Listed shares
- Bonds
- Cryptocurrencies
- Certain savings and investment instruments
In effect, investors could face a tax liability without having received any corresponding cash proceeds. The central policy objective appears to be aligning taxation more closely with annual economic benefit, rather than deferring taxation until disposal.
However, taxing unrealised gains introduces volatility risk into the tax base. Asset prices fluctuate — sometimes dramatically — between valuation dates and the time tax becomes payable.
A Historical Illustration: The Tulip Analogy
To illustrate the potential mechanics, one might draw from the Dutch Tulip Mania of the 1630s.
Imagine an investor who purchases assets worth €50,000. By year-end, the portfolio rises to €75,000 — a paper gain of €25,000. At a 36% rate, the tax due would be €9,000.
If the market subsequently declines before the tax payment date — reducing the portfolio to €55,000 — the investor still owes €9,000 based on the earlier valuation. Without sufficient cash reserves, the investor may be compelled to sell assets to meet the tax obligation.
The economic outcome could be that, despite a modest overall gain, the investor’s portfolio is reduced both in value and in quantity of assets held.
This example highlights a core tension: taxation based on valuation dates rather than liquidity events can create mismatches between tax liability and actual economic capacity to pay.
Implications for Volatile Assets
The impact may be particularly acute for highly volatile assets such as cryptocurrencies. Markets characterised by large price swings could expose holders to significant tax bills in peak valuation periods, followed by substantial corrections.
In such circumstances, investors could find themselves:
- Paying tax on gains that later disappear;
- Forced to liquidate long-term holdings;
- Holding fewer assets after tax, despite no real economic enrichment.
The policy question becomes whether annual valuation-based taxation fairly reflects income, or whether it penalises long-term capital formation.
Broader European Context
The Netherlands is not alone in reconsidering wealth and exit taxation frameworks. Germany has extended certain post-emigration tax rules. France and Norway apply exit taxes in specific circumstances. Denmark has debated substantial taxation measures relating to cryptocurrency holdings. Meanwhile, the Organisation for Economic Co-operation and Development (OECD) continues to promote international tax harmonisation and transparency standards.
These developments suggest a broader trend toward expanding tax bases in response to mounting fiscal pressures across Western economies.
Fiscal Pressures and Policy Drivers
Many developed economies face:
- Elevated sovereign debt levels;
- Rising interest payment burdens;
- Demographic pressures on welfare systems;
- Political demands for redistribution.
In such an environment, policymakers increasingly explore mechanisms to capture taxable capacity that previously escaped annual assessment.
Unrealised gains taxation may be seen as a method of reducing deferral advantages enjoyed by asset holders. Critics, however, argue that it risks discouraging investment, capital formation and entrepreneurial risk-taking.
Investment Behaviour and Incentives
Tax policy inevitably shapes behaviour. If investors anticipate annual taxation on valuation increases:
- Risk appetite may decline;
- Capital may migrate to jurisdictions with more favourable regimes;
- Asset allocation strategies may shift toward structures that mitigate annual valuation exposure.
From a legal and advisory perspective, this raises important considerations for cross-border investors and those with geographically diversified holdings.
Lawful Wealth Protection: Prudence, Not Panic
While emotive rhetoric often accompanies discussions of tax reform, the prudent response lies in careful planning within the law.
Several principles remain relevant:
1. Diversification and Asset Allocation
Investors should review portfolio composition in light of potential liquidity requirements. Holding some liquid reserves may mitigate forced-sale risk.
2. Custody and Counterparty Risk
Where digital assets are involved, custody structures matter. Self-custody solutions reduce counterparty exposure, although they introduce personal responsibility and security obligations.
3. Regulatory Compliance
Any strategy involving privacy tools, cross-border movement, or alternative acquisition methods must comply with applicable anti-money laundering, tax reporting and exchange control laws. Advisers should caution strongly against unlawful evasion.
4. Jurisdictional Planning
Residence and domicile remain critical determinants of tax liability. While relocation is a legitimate option in international tax planning, it requires professional advice and careful consideration of exit taxes, controlled foreign company rules and reporting obligations.
Bitcoin and the Property Debate
Supporters of Bitcoin frequently characterise it as a hedge against monetary debasement. Unlike fiat currency issued by central banks such as the European Central Bank (ECB), Bitcoin has a fixed supply schedule.
However, Bitcoin remains volatile, regulatory frameworks continue to evolve, and tax authorities worldwide increasingly treat it as taxable property. Investors should therefore approach digital asset strategies with both technical competence and regulatory awareness.
Holding assets privately does not eliminate tax obligations. Lawful compliance remains essential.
Conclusion
The Netherlands’ proposed unrealised capital gains tax represents a significant policy shift with wide-ranging implications. Whether it enhances fairness or undermines investment incentives will become clearer over time.
For investors and advisers, the key lessons are:
- Understand the mechanics of the tax base;
- Assess liquidity exposure;
- Review cross-border structures;
- Seek professional guidance before implementing material changes.
Tax systems evolve. Those who remain informed, diversified and legally compliant will be best positioned to navigate the changing landscape.