The Dutch wealth tax, officially box 3 income from savings and investments (inkomen uit sparen en beleggen) and often called vermogensbelasting, is one of the most misunderstood parts of the Dutch tax system, especially for expats. Unlike most countries that tax your actual investment returns, the Netherlands taxes you based on a deemed return on your total assets. This unique system can work in your favor or against you, depending on your situation.
This guide explains how Box 3 works in 2026, what it means for your savings and investments, and how to legally minimize your tax bill.
How Box 3 Works
The Dutch income tax system has three "boxes":
- Box 1: income from work and primary residence (progressive rates up to 49.5%)
- Box 2: income from substantial shareholdings (holding 5%+ of a company)
- Box 3: income from savings and investments (wealth tax)
Box 3 applies to your net assets — total assets minus qualifying debts — as measured on January 1 of each tax year. The tax is not based on how much you actually earned from these assets during the year.
The Deemed Return System (2026)
Since 2023, the Dutch government has been transitioning to a new Box 3 system. In 2026, the system works as follows:
- Savings (bank deposits) receive a deemed return based on the average interest rate banks actually paid — provisionally 1.28% for 2026
- Investments (stocks, ETFs, bonds, crypto, etc.) receive a fixed deemed return of 6.00% in 2026
- Debts are offset against assets, with a deemed interest cost based on mortgage interest averages
The tax rate applied to the deemed return is 36% in 2026.
The Tax-Free Allowance
The first portion of your Box 3 assets is exempt from tax:
- Single person: €59,357 tax-free in 2026
- Fiscal partners: €118,714 combined tax-free in 2026
Only assets above this threshold are subject to the deemed return calculation.
Practical Example
Let us say you are a single expat with the following assets on January 1, 2026:
- Savings account: €40,000
- Investment portfolio: €80,000
- Total: €120,000
After subtracting the tax-free allowance of €59,357, your taxable base is €60,643. The tax office determines how much of this relates to savings vs investments based on the ratio of your assets. In this case, 33% savings and 67% investments.
The deemed return is calculated as roughly: (€20,214 × 1.28%) + (€40,429 × 6.00%) = €259 + €2,426 = approximately €2,685 deemed return. At 36% tax, you would owe about €966 in Box 3 tax.
If your investments actually returned 12% (€9,600 in real gains), your effective tax rate on actual returns is only about 10%. If your actual return was lower than the deemed return, you can use the counter-evidence scheme (tegenbewijsregeling) to be taxed on your actual return instead, but you have to show the numbers yourself. Your actual return includes price gains you have not cashed in, and no tax-free allowance applies to it.
Savings vs Investments Under Box 3
The different deemed returns for savings vs investments create an important dynamic:
- Savings are taxed lightly — with a deemed return of 1.28% in 2026, the effective tax on savings is under 0.5% of the total value. If you are earning more than that in interest on your savings account, you keep most of the return (whether it beats inflation is another matter: see savings rates against inflation)
- Investments are taxed more heavily on paper — with a 6% deemed return, the effective tax is about 2.2% of total investment value. But if your investments earn more than 6% in a year, the extra is not taxed
The key insight: Box 3 rewards higher returns. If you earn more than the deemed return, the extra gains are tax-free. If you earn less, you can ask to be taxed on your actual return instead, using the counter-evidence scheme described above.
The 30% Ruling and Box 3
The 30% ruling used to come with the option to be treated as a "partial non-resident taxpayer," which limited Box 3 to Dutch real estate and a few related rights, so most savings and investments, Dutch or foreign, were left out. That option was abolished from 1 January 2025. Only rulings already applied in the December 2023 payroll keep it, and only until 31 December 2026.
If you arrived more recently, Box 3 applies to your worldwide assets, whether the account is held in the Netherlands or abroad. Consult a tax advisor if you hold assets in several countries, since tax treaties can affect how foreign real estate is treated.
Strategies to Minimize Box 3 Tax
1. Use Your Tax-Free Allowance Wisely
If you and your partner count as fiscal partners, your combined allowance in 2026 is €118,714, double the single amount (for how a shared account is declared, see joint bank accounts). This can eliminate Box 3 tax entirely for many couples. Savings in your children's names count with yours until they turn 18: see savings accounts for children.
2. Time Your Asset Position Around January 1
Since Box 3 is based on your assets on January 1 only, the timing of large purchases or payments can matter. Paying a large bill in December instead of January reduces your January 1 balance. However, moving investments into savings in the 3 months before 1 January and buying them back within 3 months does not lower your tax: the tax office ignores such switches.
3. Know Which Debts Count
Debts above €3,800 per person (€7,600 for fiscal partners) reduce your Box 3 base in 2026. However, your primary mortgage is excluded from Box 3 (it falls under Box 1). Paying off a Box 3 debt from savings does not lower your tax in 2026: debts above the threshold reduce your deemed return by 2.70% of their value, while savings only add 1.28%.
4. Consider Green Investments
Investments in approved "green" funds (groene beleggingen) receive a separate exemption on top of the general allowance. In 2026 the exemption is up to €26,715 per person (€53,430 for fiscal partners), and it is being phased out from 2027.
5. Maximize Pension Contributions
Contributions to approved pension products (lijfrente) reduce your Box 1 income and are not counted in Box 3. For freelancers especially, this can be a powerful tax planning tool.
The Future of Box 3
The Dutch government has been reforming Box 3 since a landmark Supreme Court ruling in December 2021 (the "Christmas ruling") found the old system violated property rights and the ban on discrimination. A law to tax actual returns from 1 January 2028 passed the lower house on 12 February 2026, but in June 2026 the Senate put its vote on hold until the cabinet presents changes to it.
In September 2026 the cabinet proposed those changes: from 2028, gains on shares, bonds and options would mostly be taxed when you sell, and the tax-free allowance would drop to €30,846 in 2027. These are proposals, not law. For now, the system described above applies in 2026, but stay informed about changes that could affect your tax planning.
Filing Your Box 3 Declaration
When filing your annual Dutch tax return, you will need:
- Bank statements showing balances on January 1
- Broker statements showing investment values on January 1
- Any foreign account balances (they may not be pre-filled; see tax on foreign savings accounts)
- Outstanding debts (above the threshold)
Most Dutch banks and brokers provide a year-end tax overview that makes this straightforward. For foreign accounts, you will need to convert balances to euros using the exchange rate on January 1.
Box 3 tax is calculated automatically when you enter your assets in the online tax return at the Belastingdienst website. You will need your DigiD to file.