THE HAGUE — The Council of State has delivered a withering verdict on Finance Minister Eelco Heinen’s proposed capital gains tax system, warning that the legislative package has been drawn up far too hastily and without adequate consideration for the practical realities of implementation. In a heavily critical advisory report published on Monday, the Netherlands’ highest administrative court and constitutional advisor stated that the government’s targeted implementation deadline of 2028 is entirely unrealistic. According to the court, rushing the timeline would fail to grant the Dutch tax office, commercial banks, and other financial institutions the necessary breathing room to adapt their complex IT systems and operational procedures.
The blistering critique represents the latest major political setback for the cabinet as it struggles to steer its comprehensive budget for the upcoming year through parliament. Minister Heinen had hoped to accelerate the overhaul of the nation’s income tax framework to plug an escalating financial drain on state coffers. The current taxation mechanism—known as Box 3, which calculates the tax due on household savings and assets using a theoretical, estimated rate of return rather than actual earnings—was decisively struck down by the Council of State back in 2021. At that time, the court ruled that the system unfairly discriminated against certain savers and investors by taxing hypothetical gains that were never actually realized.
Since that landmark ruling, Dutch political parties across both the coalition and the opposition have remained deeply divided over the most equitable and legally sound method to reform Box 3. Progressive and centrist factions, including D66, the CDA, and various left-wing opposition parties, have consistently argued for a system that taxes investors directly on their actual, realized capital gains. Conversely, Heinen’s own right-wing liberal party, the VVD, alongside right-leaning opposition groups such as JA21, have thrown their weight behind a specialized capital gains tax model instead.
A €10 Billion Shortfall and the Cost of Transition
The policy debate is further complicated by stark fiscal trade-offs. Adopting a pure capital gains tax model—where investments are only taxed upon the actual realization of a sale—would create an estimated €10 billion shortfall in immediate government revenue. This massive temporary gap arises because assets would remain untaxed until a transaction occurs. Meanwhile, the transitional mechanism currently in place continues to cost the state approximately €3.5 billion annually in lost tax revenue. Under this temporary fix, savers and investors can successfully reduce their tax bills by demonstrating that their actual returns fell below the government’s estimated figures, while simultaneously avoiding any additional levy if their actual returns exceeded those estimates.
In a bid to break the political deadlock and establish a pathway forward, Minister Heinen proposed utilizing a legislative device known as a "novelle." This parliamentary mechanism permits a minister to introduce amendments to a piece of legislation after it has already cleared the Lower House of Parliament, provided it is still pending final approval and enactment in the Senate.
Heinen’s revised strategy aimed to leverage this instrument to levy capital gains taxes specifically on real estate holdings and startup businesses starting in 2028. Under the minister’s vision, this targeted approach would serve as a crucial stepping-stone toward widening the scope to encompass all asset classes and wealth forms by 2030.
Impractical Speeds and Complexity
The Council of State, however, dismantled this justification in its official advisory report. The administrative court argued that the proposed interim rules remain excessively complicated, would disproportionately impact only a fraction of total asset wealth—affecting roughly 10% of all asset wealth—and would have to be pushed through parliament and administrative channels at an unsafe and "very high speed."
Rather than attempting a fragmented, two-stage rollout that risks administrative chaos and legal challenges, the advisory body concluded that it would be vastly preferable for the government to abandon the 2028 interim step. Instead, the court recommended focusing all administrative and legislative energy on reforming the entire tax system comprehensively in a single, well-prepared overhaul scheduled for 2030.
