Dutch tax filing season opens with heavy first-day rush expected
The Netherlands’ annual income tax filing season opened Sunday with authorities expecting heavy online traffic as millions of residents rush to submit returns on the first day, which this year falls on a weekend. Officials warned that government systems could face strain, even as extra capacity has been added, and urged taxpayers to remain patient if delays occur.
The first income tax filing was submitted two minutes after midnight. Taxpayers can file returns from March 1 through May 1. While the largest volume traditionally arrives on the final day, the opening day is also among the busiest. Last year, when March 1 also fell on a Saturday, about 700,000 returns were submitted that day. More than 10 million people filed returns overall in 2025.
The Belastingdienst said it expects a similarly strong start this year. “Those people just want to get it over with quickly so they can move on,” Steef Cobben, the agency’s income tax manager, told Nu.nl. “They’ve done their homework and are ready to go.”
In previous years, high demand caused digital congestion as large numbers of users attempted to log in simultaneously via DigiD, the government’s digital identity system. System administrator Logius has expanded server capacity in response to strong interest and the mandatory use of two-step verification.
The tax authority said it scaled up capacity overnight from Saturday into Sunday. “That first day is always a bit tense,” Cobben said. “On Sunday, we won’t go to bed until everything is running the way it should.”
Logius declined to provide details about technical preparations, citing security concerns. “We always monitor server capacity,” a spokesperson said.
If systems become overloaded, users may encounter a so-called “sorry page.” Refreshing the page will not help, officials said, but waiting may. The tax authority emphasized that taxpayers still have ample time to file after March 1.
This year, 9.6 million people are receiving an invitation to file an income tax return, including 2.5 million entrepreneurs. People who do not receive an invitation may still be eligible for a refund, for example by claiming medical expenses, charitable donations or alimony.
Each year, millions of people file late. Taxpayers can request an extension, but in the most serious cases, late filing can result in fines that run into the thousands of euros.
Over the past two years, the tax authority has sent postcards to a small group of habitual non-filers. Officials said traditional blue envelopes are sometimes left unopened, while a postcard with a phone number can lower the threshold for contact. The agency has not yet said whether it will send postcards again this year.