Paying the Imposto Único de Circulação (IUC) in Portugal in 2026 — A Practical Guide to the Six Categorias, the Cilindrada/CO₂ Brackets, the Adicional for Diesel, EV and Disability Exemptions and the Birth-Month Window Before the 2027 April Switch
A practical guide to the Imposto Único de Circulação (IUC) for 2026: the six categorias, the cilindrada and CO₂ brackets, the Adicional de IUC for diesel cars, the EV and disability exemptions, the birth-month payment window, the Portal das Finanças payment flow and the April 2027 switch.