Netherlands Rewrites Wealth Tax
Box 3 moves toward actual returns
The Dutch personal income tax system divides income into three categories, known as boxes. Box 1 covers employment income and the primary residence, Box 2 covers substantial shareholdings, and Box 3 applies to savings, investments and other private wealth.
Water and Shark says the proposed Box 3 reform would tax actual returns from savings and investments at a flat 36% rate from January 1, 2028, subject to final legislative approval. The base would include interest, dividends, net rental income and annual asset appreciation, even if assets have not been sold.
Court rulings pushed the overhaul
The reform follows years of legal pressure on the old system, under which tax was calculated on assumed investment returns rather than the taxpayer’s actual result. The Dutch Tax Administration says taxpayers can compare their deemed Box 3 income with actual returns and report actual returns where relevant following Supreme Court rulings.
In practice, the Netherlands is moving away from a model that could tax income investors never actually earned. For the budget, that creates revenue pressure; for the tax system, it creates the need for more accurate but more complex administration.
Parliament backed the bill, but debate continues
The lower house of Dutch parliament approved the new Box 3 regime on February 12, 2026, with an effective date of January 1, 2028, KPMG reported. The upper house still has to debate the bill.
Deloitte notes that after the lower-house approval, the finance minister announced amendments in response to criticism of the capital growth system and the absence of a carry-back mechanism for tax losses.
Stocks, property and crypto face new treatment
The new actual-return model effectively combines two approaches. For many liquid assets, including securities, annual increases or decreases in value may be included in the tax base. For certain assets where valuation is more difficult, taxation may be closer to a capital-gains approach.
KPMG previously said the bill introduces both capital-growth tax and capital-gains tax elements for Box 3. That means some returns may be taxed annually, while others may be taxed at realization.
For investors, the central concern is unrealized gains. If shares, funds, cryptoassets or real estate rise in value on paper, a tax liability may arise before the owner receives cash from a sale.
Transition period keeps deemed returns
Until the new system starts, the Netherlands will continue using an interim model. ING Private Banking says the government remains committed to introducing actual-return taxation for Box 3 from January 1, 2028, while fictitious returns remain in place until then.
The Dutch government’s 2026 Tax Plan reduces the Box 3 tax-free allowance from €57,684 to €51,396 and raises the notional return on other assets from 5.88% to 7.78%. Taxpayers will still be able to use counterevidence arrangements to prove actual returns.
Administration becomes the main test
Taxing actual returns may make the system fairer for savers and investors with low or negative returns. It also raises the burden of reporting, valuation and documentation.
Meijburg says that if total Box 3 income is negative, losses above €500 may be carried forward to the following year and offset against positive Box 3 income. When the new regime starts, assets must be valued at fair market value so only appreciation after that date is taxed.
As experts at International Investment report, the Box 3 reform brings Dutch wealth taxation closer to investors’ real economic outcomes, but it also creates a liquidity risk: tax may become due before cash is received. For private landlords, long-term portfolio investors and holders of volatile assets, the key issue will not be only the 36% rate, but valuation rules, loss relief and whether the tax authority can administer the system without prolonged disputes.
FAQ
What is Box 3 in the Netherlands?
Box 3 is the Dutch income-tax category covering savings, investments, second homes, securities and other private wealth.
When will the new Box 3 system start?
The intended start date is January 1, 2028, subject to final approval and legislative refinement.
What tax rate is proposed?
The proposed model applies a 36% rate to actual returns from assets.
Will unrealized gains be taxed?
Yes, under the proposed model, annual appreciation on some assets may be taxed even before sale.
Why is the old system being replaced?
The old system taxed deemed returns, which could result in tax on income investors did not actually earn.