Box 3 Tax in the Netherlands: Complete Guide to Savings & Investment Tax

Key Takeaways

Box 3 taxes your savings and investments — not your salary or business income (those are Box 1).
The Netherlands uses a deemed return system: the tax authority assumes you earn a certain percentage on your wealth, and taxes that assumed income at 36%.
You do not pay tax on your actual returns. Whether you earned 20% or lost money, the deemed return is the same.
Everyone gets a tax-free allowance (heffingsvrij vermogen) of €59,357 per person (€118,714 for tax partners) in 2026.
Box 3 has been legally controversial — the Dutch Supreme Court ruled the old system violated human rights, and a new system is being phased in.

What Is Box 3?

The Dutch tax system divides income into three "boxes." Box 3 covers income from savings and investments (inkomen uit sparen en beleggen). This includes bank accounts, stock portfolios, cryptocurrency, real estate that is not your primary home, and other assets.

Unlike most countries, the Netherlands does not tax your actual capital gains or investment returns in Box 3. Instead, the Belastingdienst (Dutch Tax Authority) calculates a deemed return — a fictional percentage it assumes you earned — and taxes that amount.

This system is called the vermogensrendementsheffing (wealth yield tax).

How Does It Work? (The Short Version)

Add up all your Box 3 assets on January 1st of the tax year
Subtract your Box 3 debts (above a threshold)
Subtract your tax-free allowance (€59,357 per person)
Calculate the deemed return based on your asset mix
Pay 36% tax on the deemed return

Good to know

The reference date is always January 1st. Your wealth on that single day determines your Box 3 tax for the entire year. If you have €200,000 in your bank account on January 1st and spend it all on January 2nd, you still owe Box 3 tax on €200,000 for that year.

The Deemed Return Categories (2026)

Your Box 3 assets are split into three categories, each with a different deemed return percentage:

Category	What It Includes	Deemed Return (2026)
Savings (spaargeld)	Bank accounts, savings accounts, deposits	1.28%*
Investments (overige bezittingen)	Stocks, bonds, crypto, real estate (not primary home), loans you've given	6.00%
Debts (schulden)	Debts not related to your primary home (above the €3,800 threshold per person)	2.70%*

Warning

* The investment percentage of 6.00% is already fixed for 2026. The savings and debt percentages are provisional — the Belastingdienst uses them on your provisional assessment and sets the definitive figures in early 2027, based on actual market averages.

Quick Example

Anna is single and has the following on January 1, 2026:

Savings account: €80,000
Stock portfolio: €40,000
No debts

Step 1: Total assets = €120,000

Step 2: Calculate the deemed return per category:

Savings: €80,000 × 1.28% = €1,024
Investments: €40,000 × 6.00% = €2,400
Total deemed return: €3,424

Step 3: Subtract the tax-free allowance = €120,000 − €59,357 = €60,643 taxable base

Step 4: Her share of the deemed return = €60,643 ÷ €120,000 = 50.54% → €3,424 × 50.54% = €1,731

Step 5: Tax = €1,731 × 36% = €623

What's Included and What's Excluded?

Not everything you own falls into Box 3. Your primary residence is taxed in Box 1 (via the eigenwoningforfait). Business assets used in your company are also excluded.

Included: bank accounts, savings, stocks, bonds, ETFs, mutual funds, cryptocurrency, second homes, rental property, art and collectibles (generally), loans you have given to others.

Excluded: your primary home (eigen woning), business assets, pension savings, life insurance policies (certain types), art loaned to qualifying museums, and green investments (up to a limit).

See our dedicated articles for the full details on what counts as Box 3 wealth and what is excluded.

The Legal Controversy

Box 3 has been the most legally challenged part of Dutch tax law. In December 2021, the Hoge Raad (Dutch Supreme Court) ruled that the old deemed return system violated the right to property under the European Convention on Human Rights. The court found that taxing people on fictional returns — when actual returns were much lower — was disproportionate.

This ruling forced the government to introduce a transitional system (the "bridging legislation") and develop a new Box 3 system based more closely on actual returns. Read more in our article on the legal challenges to Box 3.

What's Changing?

The Dutch government is working on a new Box 3 system that taxes actual returns rather than deemed returns (the Wet werkelijk rendement box 3). The House of Representatives passed the bill in February 2026, but the Senate has postponed its vote, so the earliest realistic start date is 2028. Until then, the current deemed return system (the bridging legislation) remains in place.

Learn more about the upcoming Box 3 reforms.

Common Mistakes

Ignoring the January 1st reference date — Moving money around after January 1st does not change your Box 3 liability for that year.
Forgetting foreign accounts — All worldwide assets count toward Box 3, including foreign bank accounts, property abroad, and overseas investments.
Not claiming the debt deduction — If you have qualifying debts (personal loans, margin loans, etc.), they reduce your Box 3 base. Many people forget to report them.
Overlooking green investment exemptions — Investments in approved green funds can be partially exempt from Box 3.
Assuming actual losses reduce your tax — Under the current deemed return system, your actual gains or losses are irrelevant. You pay tax on the fictional return regardless.