Until now, the IUC Car Tax in Portugal was due annually by the last day of the month in which the vehicle was registered. For instance, if your car was registered in January 2007, the IUC payment was required by the end of January each year.
However, starting in 2026, as announced by the government on January 16, the IUC Car Tax will be due by the end of February for all vehicles, provided the amount is no more than 100 euros. For IUC amounts exceeding 100 euros, payment can be split into two installments: one due in February and the other in October.