Over four million vehicles in Spain remain unpaid for the 2026 Circulation Tax, according to data from the Tax Agency (SAT). This represents nearly 60% of vehicle owners who have yet to meet their financial obligation. The deadline for payment is fast approaching, raising concerns about potential late fees and enforcement actions. The SAT has not yet commented on the reasons for the high number of outstanding payments. Experts suggest potential contributing factors include economic hardship and a lack of awareness regarding the payment deadline. Vehicle owners are urged to check their status and remit payment promptly to avoid penalties. Continued non-compliance may lead to further measures from tax authorities.