The Netherlands’ Box 3 system — the wealth tax on deemed investment returns from savings and investments — has been in turmoil since a landmark Supreme Court ruling in December 2021 declared it unconstitutional. The court found that taxing people on fictitious returns, when actual returns were significantly lower (or even negative), violated property rights and the principle of fair taxation.
This guide explains what Box 3 is, what the Supreme Court ruling means in practice, how the interim actual returns regime works for 2022–2026, what is proposed for 2027, and the specific implications for expats — including the interaction with the 30% ruling and the option to exclude foreign assets from Dutch wealth tax.
Before 2022, the Netherlands taxed Box 3 assets on a deemed (fictitious) return. The system assumed investors earned a certain percentage return on their assets, regardless of what they actually earned. For example, the assumed return on savings above the exemption was set at rates that bore no relationship to actual bank deposit rates — particularly problematic during the period of near-zero or negative interest rates from 2015–2021, when savers earned virtually nothing but were still taxed on an assumed return of 2–4%.
In its landmark Kerst ruling of 24 December 2021, the Dutch Supreme Court (Hoge Raad) ruled that this system violated the European Convention on Human Rights (Protocol 1, Article 1 — right to peaceful enjoyment of possessions) and the non-discrimination provisions of the ECHR. The court held that individuals who actually earned less than the fictitious return were entitled to compensation.
The Belastingdienst implemented a mass objection process. Taxpayers who had lodged timely objections to their Box 3 assessments for 2017–2020 were entitled to a recalculation based on actual returns. Billions of euros in refunds have been issued. Those who did not object in time generally do not qualify for automatic compensation, though some cases are still being litigated.
The ruling forced the Dutch government to overhaul Box 3 entirely. An emergency ‘bridging’ legislation was introduced for 2022 onwards, and a new permanent system is proposed from 2027. The debate has been contentious, with significant political disagreement over how to tax wealth fairly while maintaining the tax base.
For tax years 2022 through 2026, the Netherlands uses an interim actual returns system (overbruggingswetgeving). Under this system, Box 3 tax is calculated on the actual income generated from assets, categorised as follows:
Despite being called an ‘actual returns’ system, the interim regime uses a hybrid approach — some asset classes use actual returns, while others still use fixed assumed rates:
This means the interim system is still partially fictitious for investment assets — it fully addresses the problem only for savers with cash deposits. Investors with share portfolios continue to be taxed on a deemed return that may not match reality.
The Box 3 tax rate is 36% on the net deemed or actual return above the exemption. The 2026 exemption is €57,000 per individual (€114,000 per couple). This exemption is applied to the total Box 3 asset base — assets below the threshold generate no Box 3 tax.
The Dutch government has proposed a permanent new Box 3 system from 2027 based on actual annual returns including unrealised gains. This system — known as ‘vermogensaanwasbelasting’ (capital increment tax) — would tax:
The proposed tax rate is 36% on the combined actual returns including unrealised gains, with a similar exemption threshold to the current system.
The proposed 2027 system has attracted significant criticism:
As of April 2026, the 2027 system remains subject to parliamentary debate and could be modified or delayed. The current interim system continues until a new permanent regime is legislated. Expats should monitor developments through the Belastingdienst website.
Box 3 applies to all individuals who are Dutch tax residents, including expats on temporary assignments, 30% ruling holders, and foreign nationals who have become Dutch residents. This means foreign investment accounts, foreign savings, foreign real estate (other than the primary residence), and other non-Dutch financial assets held by Dutch residents are all potentially in scope for Box 3.
One of the most significant and underused benefits of the Dutch 30% ruling is the option to elect partial non-resident status (keuzerecht voor partieel buitenlandse belastingplicht). Under this election:
For an expat with a significant US investment portfolio, UK pension fund, or foreign property holding, this election can eliminate Box 3 entirely on those assets. This is a substantial financial benefit that is separate from the income tax saving of the 30% ruling itself.
An expat earning €120,000 under the 30% ruling with €500,000 in foreign investments elects partial non-resident status. Without the election, Box 3 on €500,000 (above the €57,000 exemption) would be approximately €15,900 per year at the 36% rate on assumed returns. By electing partial non-resident status, those foreign investments are outside Dutch Box 3 entirely — a saving of ~€15,900 per year in addition to the income tax saving from the ruling.
Dutch residents who objected to Box 3 assessments in prior years may be entitled to compensation under the mass objection procedure. If you filed Dutch tax returns as a resident in 2017–2020 and lodged timely objections, contact the Belastingdienst or a Dutch tax adviser to assess your entitlement.
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