Dutch Parliament Passes Box 3 Capital Gains Tax Reform Plan
Box 3 tax reform passed a key vote in the Dutch parliament on Thursday night, November 12, 2026, after right-wing parties reversed their initial hesitation.
Opposition members heavily criticized the timeline and funding structure of the proposal, arguing that the measure was being rushed through the parliament too quickly.
Parliamentary Support Despite Financial Gaps
The cabinet plans to transition to a capital gains tax system by 2029, taxing investment returns only upon the realization of assets. That overhaul will cost on term nearly 20 miljard euro, according to reporting by De Telegraaf. Initially, parties including JA21, SGP, and BBB expressed doubts regarding their support following a left-leaning shift in the broader tax plan. Yet, those factions ultimately voted in favor on Thursday evening. All three coalition parties also voted in favor of the adjustment.
According to NOS, opposition members heavily criticized the timeline and funding structure of the proposal. “Een ongedekte, blanco cheque van 17 miljard euro voor vermogenden,” said Pro-Kamerlid Stultiens during the parliamentary debate.
He characterized the measure as expensive amateurism and pointed out that the cabinet’s own timeline allows for postponement until 2029, removing any justification for parliamentary haste. CDA-Kamerlid Van Dijk stated during the debate: “Wij vinden dit ook spannend.” He added: “Als het enigszins verantwoord is, willen wij wel springen.”
Revised Box 3 Plans Cost the State Treasury 17,6 Miljard Euro
The revised plans for box 3 will cost the state treasury a net total of 17,6 miljard euro in the years up to and including 2040, according to Minister Eelco Heinen (Financiën, VVD). “De tekorten waren dan opgelopen tot wel 26 miljard in 2040, aldus Heinen. Minister Heinen stated that he prevented larger deficits by introducing the revised plan. “En dat ga ik niet laten gebeuren,” said Heinen.”
While the proposal successfully navigated the lower house, uncertainty surrounds its trajectory in the Senate. The Raad van State issued a scathing critique of the legislative speed, while tax authorities and commercial banks said that rapid implementation presents significant operational challenges.
As NRC documented, the proposed shift alters the earlier preference for an asset-increment tax model that captured unrealized annual value gains. In the new adjustment, Minister Heinen lacks coverage for 17,5 miljard euro, which will cause the national debt to increase by that amount.
