If you're an investor, expat, or business owner with financial ties to both sides of the Atlantic, understanding the United States vs Netherlands capital gains tax systems is essential. These two countries take fundamentally different approaches to taxing investment gains — and the differences can have a dramatic impact on your after-tax returns.

In this detailed capital gains tax comparison for the 2025/2026 tax year, we'll walk you through how each country taxes capital gains, highlight the critical differences, explore the US-Netherlands tax treaty, and help you understand which system may affect you and how. Whether you're an American investing in Dutch assets, a Dutch citizen with US holdings, or a dual resident navigating both systems, this guide is for you.

How Capital Gains Tax Works in the United States (2025/2026)

The United States taxes capital gains on a realization basis — meaning you owe tax when you actually sell or dispose of an asset at a profit. The US system distinguishes between short-term and long-term capital gains, with significantly different tax rates for each.

Short-Term Capital Gains

Short-term capital gains apply to assets held for one year or less. These gains are taxed as ordinary income, meaning they're subject to the same federal income tax brackets that apply to wages and salaries. For 2025, federal ordinary income tax rates range from 10% to 37%, depending on your taxable income and filing status.

Long-Term Capital Gains

Assets held for more than one year qualify for preferential long-term capital gains tax rates. For the 2025 tax year, the federal long-term capital gains rates are:

  • 0% — Single filers with taxable income up to approximately $48,350; married filing jointly up to $96,700
  • 15% — Single filers with taxable income from $48,351 to $533,400; married filing jointly from $96,701 to $600,050
  • 20% — Single filers with taxable income above $533,400; married filing jointly above $600,050

Net Investment Income Tax (NIIT)

High-income taxpayers in the US may also owe an additional 3.8% Net Investment Income Tax (NIIT) on capital gains if their modified adjusted gross income exceeds $200,000 (single) or $250,000 (married filing jointly). This effectively raises the top federal capital gains rate to 23.8%.

State-Level Capital Gains Taxes

Don't forget that most US states also tax capital gains. States like California can add up to 13.3% on top of the federal rate, while states like Texas, Florida, and Nevada impose no state income tax at all. This means the total effective capital gains tax rate in the US can range from 0% to over 37% depending on your state of residence, holding period, and income level.

Use our United States Capital Gains Tax Calculator to estimate your exact federal and state capital gains tax liability for 2025.

How Capital Gains Tax Works in the Netherlands (2025/2026)

The Netherlands takes a radically different approach to taxing capital gains — one that often surprises Americans and other international investors. Rather than taxing actual realized gains, the Dutch system taxes a deemed (fictitious) return on your net assets.

The Box System

The Netherlands organizes income into three "boxes":

  • Box 1: Income from employment, business, and primary residence
  • Box 2: Income from a substantial interest (5% or more) in a company
  • Box 3: Income from savings and investments

For most individual investors, capital gains fall under Box 3, which is where the Dutch system diverges most significantly from the American approach.

Box 3: Deemed Return on Assets (2025)

Under Box 3, the Dutch government does not tax your actual capital gains. Instead, it assumes you earned a fictitious return on your net assets (assets minus qualifying debts) above a tax-free threshold. This deemed return is then taxed at a flat rate of 36% for 2025.

The deemed return percentages for 2025 are calculated based on the composition of your assets:

  • Savings (bank deposits): A lower deemed return percentage (tied to actual average savings interest rates, approximately 1.03% for 2025)
  • Other investments (stocks, bonds, real estate other than primary home): A higher deemed return percentage (approximately 6.04% for 2025)
  • Debts: A deductible deemed cost percentage (approximately 2.47% for 2025)

The tax-free threshold (heffingsvrij vermogen) for Box 3 in 2025 is approximately €57,684 per person (€115,368 for fiscal partners).

Box 3 Practical Example

Let's say you're a single resident of the Netherlands with €200,000 invested in stocks and no qualifying debts:

  1. Taxable base: €200,000 − €57,684 (tax-free threshold) = €142,316
  2. Deemed return: €142,316 × 6.04% = €8,595.89
  3. Tax owed: €8,595.89 × 36% = €3,094.52

Notice that you owe this tax regardless of whether your investments actually gained or lost value. If your portfolio dropped 10%, you'd still owe approximately €3,095 in Box 3 tax.

Use our Netherlands Capital Gains Tax Calculator to run your own scenarios and estimate your Dutch investment tax.

Box 2: Substantial Interest

If you own 5% or more of a Dutch (or qualifying foreign) company, your capital gains fall under Box 2. For 2025, Box 2 gains are taxed at:

  • 24.5% on the first €67,000 of gains (€134,000 for fiscal partners)
  • 33% on gains above that threshold

This is a tax on actual realized gains, making it more similar in concept to the US system.

Key Differences: United States vs Netherlands Capital Gains Tax

The tax comparison between the United States and the Netherlands reveals several fundamental differences that investors must understand:

Feature United States Netherlands
Basis of taxation Actual realized gains Deemed (fictitious) return on net assets (Box 3)
Short-term vs long-term distinction Yes (1-year threshold) No (Box 3); N/A for Box 2
Top federal/national rate 23.8% (incl. NIIT) 36% (Box 3); 33% (Box 2)
Tax-free threshold 0% bracket for low-income taxpayers ~€57,684 per person (Box 3)
Loss recognition Yes — up to $3,000/year against ordinary income, unlimited carryforward No (Box 3); Yes (Box 2)
State/local taxes Varies by state (0%–13.3%) No additional local investment tax
Primary residence Up to $250K/$500K exclusion on sale Taxed under Box 1 (deemed rental value), not Box 3
Tax year Calendar year (Jan–Dec) Calendar year (Jan–Dec)

Who Benefits from Each System?

  • The US system favors investors who hold assets long-term and realize gains strategically, especially those in low-income years or residing in no-income-tax states. It also benefits investors who experience losses, since these can offset gains.
  • The Dutch system favors investors whose actual returns significantly exceed the deemed return percentage. If your portfolio earns 15% annually, you're only taxed as though you earned ~6%, which can be advantageous. However, it penalizes investors in down years or those holding low-return assets classified as "other investments."

The US-Netherlands Tax Treaty and Double Taxation

The United States and the Netherlands have a comprehensive bilateral tax treaty designed to prevent double taxation and reduce tax evasion. For capital gains, the treaty contains several important provisions:

Key Treaty Provisions for Capital Gains

  1. Real property gains: Gains from the sale of real estate are generally taxable in the country where the property is located (the "situs" country).
  2. Business property gains: Gains attributable to a permanent establishment are taxable in the country of the permanent establishment.
  3. Share sales: Gains from selling shares are generally taxable only in the country of residence of the seller, with exceptions for real-property-rich companies.
  4. Other capital gains: Most other capital gains are taxable only in the seller's country of residence.

Foreign Tax Credits

  • US taxpayers can generally claim a Foreign Tax Credit (Form 1116) for Dutch taxes paid on the same income, reducing their US tax liability dollar-for-dollar (subject to limitations).
  • Dutch taxpayers can similarly claim relief for US taxes paid under the treaty's provisions and Dutch domestic law.

Special Considerations for US Citizens in the Netherlands

The United States taxes its citizens and green card holders on worldwide income, regardless of where they live. This means an American living in the Netherlands must file US tax returns and report global capital gains to the IRS, even if those gains are also subject to Dutch Box 3 tax.

This creates a unique challenge: the Dutch Box 3 tax is based on deemed returns, while the US taxes actual returns. The mismatch can make claiming foreign tax credits complicated. In some cases, the IRS may not fully recognize Dutch Box 3 tax as a creditable income tax, potentially leading to partial double taxation. Specialized tax advice is critical in this situation.

Practical Scenarios: Capital Gains Tax Comparison in Action

Let's compare the tax impact under both systems using concrete examples for the 2025/2026 tax year.

Scenario 1: Stock Portfolio Gain of $100,000

Assumptions: Single individual, held stocks for more than one year, $150,000 in other ordinary income, residing in a no-income-tax US state.

United States:

  • Long-term capital gains rate: 15% (based on income level)
  • NIIT: 3.8% (income exceeds $200,000 threshold when gain is included)
  • Total federal tax: $100,000 × 18.8% = $18,800

Netherlands (Box 3):

  • Assume total portfolio value of €500,000 (approximately $550,000 at current exchange rates)
  • Taxable base: €500,000 − €57,684 = €442,316
  • Deemed return: €442,316 × 6.04% = €26,715.89
  • Tax: €26,715.89 × 36% = €9,617.72 (~$10,580)

In this scenario, the Dutch system results in a lower tax burden — but remember, the Dutch tax is owed regardless of whether the $100,000 gain was actually realized.

Scenario 2: Portfolio Loss of $50,000

United States:

  • Capital loss deduction against ordinary income: $3,000 (saving roughly $740–$1,110 depending on bracket)
  • Remaining $47,000 loss carries forward to future years
  • Net tax impact: Tax benefit

Netherlands (Box 3):

  • Same €500,000 portfolio, same deemed return, same tax: €9,617.72 owed
  • No recognition of actual losses
  • Net tax impact: Tax owed despite real losses

This scenario starkly illustrates the downside of the Dutch deemed-return system in bear markets.

Scenario 3: Substantial Interest (Box 2) — Selling a Business Stake

Assumptions: Selling a 25% stake in a Dutch BV for a €200,000 gain.

Netherlands (Box 2):

  • First €67,000 at 24.5% = €16,415
  • Remaining €133,000 at 33% = €43,890
  • Total: €60,305

United States (equivalent):

  • If long-term: $220,000 gain × 20% = $44,000 + 3.8% NIIT = $52,360
  • Total: approximately $52,360 (~€47,600)

In this case, the US system produces a lower tax on the business sale.

You can model your own scenarios using our United States Capital Gains Tax Calculator and Netherlands Capital Gains Tax Calculator.

Common Mistakes and Misconceptions

When comparing capital gains tax in the United States and the Netherlands, several misconceptions frequently trip up taxpayers:

1. "The Netherlands doesn't tax capital gains"

This is technically true for Box 3 (there's no tax on actual gains), but the deemed-return tax can be substantial. Many investors end up paying more under the Dutch system than they would on their actual gains, especially in low-return years.

2. "I can avoid US tax by moving to the Netherlands"

US citizens and green card holders are taxed on worldwide income regardless of residence. Moving abroad does not eliminate US filing obligations or tax liability on capital gains. You may be subject to both systems.

3. "Foreign tax credits always eliminate double taxation"

The mismatch between the Dutch deemed-return system and the US actual-gain system can create situations where credits don't fully offset taxes paid. The IRS may also treat certain Dutch taxes as non-creditable.

4. "Short-term vs long-term doesn't matter in the Netherlands"

For Box 3, this is correct — there's no holding period distinction. But for Box 2 (substantial interest), timing and realization do matter, and for US-connected taxpayers, the US holding period rules always apply to the US side of the calculation.

5. "The Dutch tax-free threshold means small portfolios are untaxed"

While the ~€57,684 threshold is generous, it applies to net assets, meaning your savings accounts, investment accounts, second properties, and crypto holdings all count toward this total. Many people exceed the threshold without realizing it.

Frequently Asked Questions

Do I need to pay capital gains tax in both the US and the Netherlands?

It depends on your residency and citizenship status. US citizens always owe US tax on worldwide gains. Dutch residents owe Box 3 (or Box 2) tax on qualifying assets. The US-Netherlands tax treaty and foreign tax credits can help reduce — but may not fully eliminate — double taxation.

How is cryptocurrency taxed in each country?

In the United States, cryptocurrency is treated as property, and gains are taxed as capital gains (short-term or long-term based on holding period). In the Netherlands, crypto holdings are included in your Box 3 net asset calculation and taxed via the deemed-return system.

Which country has lower capital gains tax?

There's no universal answer. The US can be cheaper for long-term gains realized by low-to-moderate-income taxpayers, especially in no-income-tax states. The Netherlands can be cheaper for high-performing portfolios where actual returns far exceed the deemed return. Use our United States Capital Gains Tax Calculator and Netherlands Capital Gains Tax Calculator to compare your specific situation.

What about real estate capital gains?

In the US, you may exclude up to $250,000 ($500,000 for married couples) of gain on your primary residence. Investment property gains are taxed at capital gains rates plus potential depreciation recapture at 25%. In the Netherlands, your primary residence is taxed under Box 1 (deemed rental value, not capital gains), while second/investment properties fall under Box 3's deemed-return system.

Are there any upcoming changes I should know about?

The Dutch Box 3 system has been in flux following a 2021 Supreme Court ruling (the Kerstarrest) that found the old deemed-return system violated property rights. The Dutch government has been phasing in a revised system that more closely reflects actual asset composition. Further reforms are expected in 2027 and beyond. In the US, capital gains tax policy is frequently debated, and rates could change with new legislation.

Conclusion: Key Takeaways for the 2025/2026 Tax Year

The United States vs Netherlands capital gains tax comparison reveals two philosophically different systems:

  • The US system taxes actual realized gains with preferential rates for long-term holdings, rewards tax-loss harvesting, and varies significantly by state.
  • The Dutch system taxes a fictitious return on net assets above a generous threshold, ignoring actual gains and losses, with a flat 36% rate on the deemed return.

Key action items:

  1. Know your residency and citizenship status — this determines which system(s) apply to you.
  2. Understand the tax treaty — the US-Netherlands treaty can provide relief, but mismatches between the two systems create complications.
  3. Model your specific situation — use our calculators to see real numbers rather than relying on generalizations.
  4. Seek professional advice — especially if you're a US citizen in the Netherlands or have substantial cross-border investments.
  5. Stay informed — both countries are actively evolving their capital gains tax rules.

Estimate your obligations now with our United States Capital Gains Tax Calculator or Netherlands Capital Gains Tax Calculator. For a broader view of your overall tax situation, try our United States Income Tax Calculator or Netherlands Income Tax Calculator.

This article is for informational purposes only and does not constitute tax advice. Tax laws change frequently; consult a qualified tax professional for advice specific to your situation.