Dutch Box 3 Explained for ETF Investors

What is Box 3?

The Dutch income tax system has three "boxes". Box 1 is employment and business income (progressive rates). Box 2 is substantial shareholdings. Box 3 is savings and investments held by private individuals.

Box 3 does not tax what you actually earned on your investments. Instead, it applies a fixed deemed return rate to your net wealth (assets minus debts) as it stands on January 1 of each tax year. You pay 36% tax on that notional return — regardless of whether your portfolio went up, down, or sideways.

The tax is assessed annually when you file your income tax return (aangifte inkomstenbelasting), typically in the spring for the prior calendar year.

How it is calculated in 2025

For 2025, the Dutch tax authority (Belastingdienst) applies three separate notional return rates depending on asset category:

The tax-free threshold (heffingvrij vermogen) is €57,684 per person for 2025 (indexed annually). Below this amount, no Box 3 tax applies. Fiscal partners each get their own threshold, so a couple has €115,368 combined before any Box 3 tax is owed.

Accumulating vs distributing ETFs — no difference under Box 3

This is a common point of confusion. Under Box 3, it makes no tax difference whether you hold an accumulating ETF (VWCE, IWDA) or a distributing ETF (VWRL). Both are taxed on the total portfolio value as it stands on 1 January — not on dividends received or capital gains realised.

An accumulating ETF reinvests dividends internally, increasing its NAV. A distributing ETF pays dividends in cash, leaving NAV lower but putting cash in your account. Either way, your total net wealth on 1 January is approximately the same — and Box 3 taxes that wealth identically.

The legal situation: Supreme Court rulings

In December 2021 (the "Kerstarrest"), the Dutch Supreme Court ruled that the old Box 3 system — which assumed everyone earned 5.69% regardless of actual returns — violated European human rights law (the right to peaceful enjoyment of property). The system was held to cause unlawful overtaxation for investors who earned less than the deemed rate.

The government introduced a temporary fix (the "Herstelheffing" patch) splitting assets into the three categories shown above, with lower rates for savings. In June 2024, the Supreme Court ruled again, confirming that the patched system remains lawful as a transitional measure but ordered that taxpayers who can demonstrate actual lower returns may apply for a correction.

In practice, the Belastingdienst is introducing a new form — the Opgaaf Werkelijk Rendement (OWR) — that allows investors to report actual returns instead of notional ones. If your actual return was lower than the 5.88% deemed rate, you can opt for actual return taxation. This is voluntary for tax years up to 2027.

The 2028 reform: actual return taxation

From 2028, the Netherlands plans to shift Box 3 to a full actual-return system — taxing the genuine return on each asset. Under the current proposal, this will include:

• Dividends and interest received
• Capital gains realised when you sell
• For accumulating ETFs: the annual increase in NAV (unrealised gains taxed annually)

The last point matters most for ETF investors. Under the 2028 design, accumulating ETFs would be taxed on unrealised gains each year — making them no longer equivalent to distributing ETFs from a tax perspective. A distributing ETF would distribute cash (taxed as income), but unrealised NAV growth would not be taxed until realised. The final legislation had not been passed as of mid-2026 and the design details are still being debated in parliament.

30% ruling and Box 3

Employees using the 30% ruling have the option to elect partial non-residency for Box 2 and Box 3 purposes. If this election is made, Box 3 applies only to Dutch-situated assets (real estate in the Netherlands, substantial shareholdings in Dutch companies). Foreign-held ETF portfolios — VWCE on Xetra, IWDA on Euronext — are then excluded from Box 3 entirely.

This election is made annually on your tax return. If you are under the 30% ruling and hold significant foreign investments, confirm the election is active — it is not automatic. Note that the 30% ruling has been restricted in recent years (maximum ruling period reduced from 8 to 5 years) and further changes are possible.