The Dutch tax authority began processing claims for reimbursement of excess wealth tax payments on Monday, March 2, 2026, following a ruling by the Dutch Supreme Court. The initiative, impacting hundreds of thousands of citizens, is expected to cost the government billions of euros, according to reporting from NOS.
The large-scale correction stems from the way the tax authority calculated wealth tax – officially known as the ‘vermogensrendementsheffing’ – between 2017 and the present. The Supreme Court determined that the method, which relied on a ‘fictitious yield’ rather than actual investment returns, could be unfair. The tax authority had assumed a certain level of return on assets, ranging from 30 to 36 percent, regardless of individual performance.
Individuals who believe they overpaid can now submit a form to the tax authority detailing their actual returns. The NOS report explains that the tax authority previously calculated tax obligations based on an estimated, or fictitious, yield, rather than individual investment performance. This meant taxpayers were sometimes required to pay tax on income they did not actually receive.
The opening of the online portal for tax returns on March 1, 2026, was met with significant technical difficulties. According to Headliner.nl and reporting in De Telegraaf, the system received 167,000 submissions within hours of opening, causing login issues for many users. The surge in traffic overwhelmed the servers, leaving many taxpayers unable to access the system immediately.
The Belastingdienst (Dutch Tax and Customs Administration) anticipated high demand, as reported by NU.nl, acknowledging that the first day of tax filing is “always a bit exciting.” However, the scale of the initial rush appears to have exceeded expectations, leading to frustration among those attempting to file their returns.
