XJuly 20, 2026
By default, the Netherlands can tax you on investment returns you never earned.
For 2026 it assumes your investments returned 6 percent and taxes that at 36 percent. Unless you prove a lower return, that bill lands whether the market rose, flatlined or fell.
This is Box 3, the tax on savings and investments. Since 2001 it runs on a deemed return, a fixed rate the state assumes you earned, not what you actually got. For 2026 that rate on investments is 6.00 percent, taxed at a flat 36 percent, so 2.16 percent of your invested value every year, above an allowance of 59,357 euros per person, near 67,900 dollars. Residents are generally taxed on worldwide assets, so a foreign broker counts.
A single resident holding 1,000,000 euros of investments on 1 January, with no deductible debt, faces a default Box 3 bill of about 20,300 euros a year, near 23,200 dollars, even in a year the million ended worth less. A conventional realization-based capital gains tax waits for a sale and taxes only the gain. Box 3 applies to the assets you hold, whether they gained or not.
It took two Supreme Court defeats to crack that. The Christmas ruling of December 2021, then the rulings of June 2024, held that Box 3 may never tax more than your real return. Since July 2025 you can report your actual return and pay the lower of the two. A total Box 3 return you document as negative is reduced to zero.
But the fiction stays the default, and the burden sits on you. To claim the lower amount you report the real figure and must be able to prove it, cannot deduct most costs, and a loss does not carry forward. From 2028, if the bill now before the Senate holds, the system moves to taxing actual returns.
On the 233 jurisdictions I score, the Netherlands is a strong base, top tier on healthcare, banking and quality of life, near the floor on tax freedom. Box 3 is a real part of why.
For a large portfolio the question is not the 6 percent or the 36 percent. It is who carries the burden of proof in a flat or losing year. Would you hold serious assets where the tax office assumes a positive return and leaves you to document the loss?
Data from GeoCompass, the jurisdiction intelligence layer I build at Lucky Nomads.
Netherlands