The final weekend before the May 1 deadline for filing income tax in the Netherlands has begun, with authorities warning that late submissions can trigger fines up to 6,709 euros and other penalties.The Belastingdienst, the Dutch tax authority, is processing income tax returns for 2025 earnings and has kept the filing window open for nearly three months. Despite that, a consistent group of taxpayers misses the deadline each year. In 2023, the most recent year with complete figures, over 75,000 tax returns arrived after May 1.