Finance
Mar 4, 2026
Box 3 Is Changing Again. Here Is What It Means for Your Wealth in the Netherlands
Box 3 wealth tax rules in the Netherlands are shifting again. Here is what expats and homebuyers need to understand and what to do now.
Box 3 Is Changing Again. Here Is What It Means for Your Wealth in the Netherlands
If you have been trying to keep up with Dutch tax news, you have probably noticed that Box 3 never seems to stay still. Rules change, courts intervene, and politicians keep sending things back to the drawing board.
For expats and first-time buyers trying to plan their finances in the Netherlands, this is genuinely confusing. And confusion about tax is expensive.
So let us cut through the noise. In this article, we explain exactly what Box 3 is, how it works right now, what is coming, and what it means for you personally, whether you are saving for your eerste huis kopen, already on the property ladder, or managing investments as an expat.
What Is Box 3 and Why Does It Keep Making Headlines?
The Dutch income tax system works in three boxes. Box 1 taxes your employment income. Box 2 covers income from significant business stakes. Box 3 taxes your assets: savings accounts, investment portfolios, crypto, and second properties.
The reason Box 3 keeps making headlines is a fundamental legal and political fight that has been running for years. The core question: should you pay tax on what the government assumes you earned, or on what you actually earned?
This is not a minor technicality. When Dutch interest rates were near zero for years, millions of savers paid tax on returns they never received. The Dutch Supreme Court called this unacceptable, and the system has been in repair mode ever since.
How Box 3 Works Right Now (2025 to 2026)
The Transitional Period Explained
We are currently in an overgangsperiode, a transitional phase. The old system was struck down legally, but a fully new one is not in place yet. So the government is using modified rules while it builds the permanent solution.
Your assets are divided into three categories: bank deposits, other assets (investments, crypto, second homes), and debts. Each gets a different assumed return percentage.
For 2026, the key figures are: the tax-free allowance is 59,357 euros per person (or 118,714 euros for fiscal partners), the assumed return on investments has risen to 7.78%, and you pay a flat 36% tax on the total calculated return above that exemption.
So if you have a significant investment portfolio, your assumed return and your tax bill could be much higher than what you actually earned this year.
The Actual Return Option: The OWR Form
Here is what many people miss. If your real return was lower than the government's assumed percentage, you can now challenge that.
The Dutch Supreme Court ruled the tax office cannot tax you on more than you actually earned. You can file an Opgaaf Werkelijk Rendement (OWR) form through the Belastingdienst to report your actual figures. This is not automatic. You have to do it yourself. But for investors with modest or negative actual returns, it can make a meaningful financial difference.
What Is Changing From 2028?
Parliament Has Approved a New System
In February 2026, the Dutch House of Representatives approved a fundamentally new Box 3 regime taking effect on 1 January 2028. The core shift: instead of assumed returns, you will pay tax on what you actually earn from your assets.
Under the new system, you will be taxed on interest received, dividends, rental income, and unrealised capital gains, meaning the growth in value of your investments even if you have not sold them.
The Paper Gains Problem
Taxing unrealised gains means you could owe tax on an investment that grew on paper, even though you sold nothing and received no cash. If your portfolio increases by 10,000 euros this year, you could owe tax on that gain while still fully invested.
There is also an asymmetry worth knowing. If you pay tax on a gain this year and the investment drops next year, you can carry that loss forward. But you cannot recover taxes already paid on past gains. You could end up taxed on money that later disappears. This is actively being reviewed before 2028.
The Exception for Property and Start-Ups
There is an important carve-out. For real estate and start-up shares, a capital gains tax approach applies instead. You only pay tax on actual gains when you sell, not on annual paper growth. For property investors, this exception is significant.
What Does This Mean for Starters?
We see this consistently: first-time buyers saving for their eerste huis kopen are often closer to the Box 3 threshold than they realise.
Once your savings cross 59,357 euros as a single person in 2026, you owe wealth tax on the amount above that level. For buyers working hard to save a deposit in Amsterdam, Rotterdam, or Utrecht, this is easier to reach than you might expect.
The practical step right now: if the Belastingdienst assumes your savings earned more than they actually did, use the OWR form to reduce your tax bill. Keep records of the actual interest earned on every account throughout the year. Your bank statements will confirm this.
Getting proper hypotheekadvies early also helps you understand how your savings, assets, and tax position interact when planning your first home purchase.
What Does This Mean for Expats?
For expats, the picture is more complex and the stakes are higher. A hypotheek voor expats already involves enough complexity. Box 3 adds another layer that many people are simply not prepared for.
The Partial Non-Resident Status Is Gone
Until 2025, expats using the 30% ruling could opt for partial non-resident tax status, which excluded foreign assets from Dutch Box 3. That option was abolished as of 2025.
This means your worldwide assets, including savings or investments held abroad, are now potentially in scope for Dutch Box 3 if you are a Dutch tax resident. Many expats are unaware of this, which can lead to underreporting and unexpected tax bills.
Foreign Savings Accounts Count
If you hold savings or investments outside the Netherlands, these are still taxable in Box 3 as a Dutch resident. As your onafhankelijk hypotheekadviseur, we regularly see expats surprised by this, especially those who maintain savings accounts in their home country.
The 30% Ruling and Box 3 Are Separate
Your salary benefit from the 30% ruling does not exempt your savings or investments from Box 3. These are entirely separate systems. Understanding how they interact is essential when planning your hypotheek voor expats and your broader financial picture in the Netherlands.
What About Existing Homeowners?
Good news: your primary residence is not in Box 3. It falls under Box 1 and is treated differently. The Box 3 changes do not directly affect your mortgage or your main home.
However, if you own a second property, a rental apartment, a holiday home, or real estate abroad, that is fully subject to Box 3. Under the current transitional rules, second properties carry a relatively high assumed return. The 2028 system will tax actual rental income plus unrealised annual gains on property value, with capital gains only triggered at point of sale.
If you own buy-to-let property in the Netherlands or abroad, the shift from current rules to the 2028 system deserves careful review. How you structure ownership could have a meaningful impact on your net returns.
What Should You Remember?
Right now (2025 to 2026): Box 3 applies above 59,357 euros per person. You pay 36% on a deemed return. If your real return was lower, file the OWR form. Foreign assets are included. The partial non-resident exemption for expats no longer applies.
From 2028: Tax will be based on actual income and unrealised capital gains. Real estate and start-up shares are exempt from annual unrealised gains tax. The system is now law, but implementation details are still being finalised.
What remains uncertain: Exactly how unrealised gains will be calculated in practice, and whether legal or political challenges delay the 2028 timeline.
The Bottom Line
Box 3 is genuinely complex and actively changing. For expats in particular, the combination of abolished partial non-resident status, worldwide asset inclusion, and the interaction with hypotheekregels Nederland makes this a topic that deserves proper attention, not just a quick search.
The worst thing you can do is assume the current rules will stay in place. They will not. The best thing you can do right now is make sure you understand your position, are not overpaying under the transitional rules, and are keeping proper records of your actual returns.
These financial decisions also connect directly to your hypotheekadvies. How you structure your savings, assets, and tax position affects what lenders see when assessing your mortgage application.
Want to Understand How This Affects Your Situation?
Tax rules are one thing. How they connect to your mortgage plans, your savings for a first home, or your position as an expat in the Netherlands is a very personal conversation.
At Financial Consultancy Holland, we work with expats and first-time buyers every day. We are your onafhankelijk hypotheekadviseur: independent, honest, and focused on what actually works for your situation.
Reach out to us at info@fc-holland.nl or call 06 22 87 09 81. No pressure. Just a clear, honest conversation about where you stand and what your options are.
