Vehicle tax tool
Estimate your annual Portuguese vehicle tax.
IUC (Imposto Único de Circulação) is paid every year, in the month of your car's registration anniversary (the matrícula date). The amount depends on engine displacement, CO₂ emissions, registration year, and fuel type. Plug in your car's specs to see the bill.
Estimated annual IUC
€189.77
Due each year in the month of your car's registration anniversary (matrícula date). Pay via Portal das Finanças (Multibanco reference or direct debit).
Breakdown
- Cilindrada component
- €159.20
- CO₂ component
- €111.90
- Age coefficient
- × 0.70
- Fuel coefficient
- × 1.00
Estimate for Categoria B (passenger cars registered after July 2007). Rate tables approximate 2026 values; treat as ±10%. Motorcycles, vans, and pre-2007 cars use different categories. Verify exact amount on Portal das Finanças in your car's registration-anniversary month each year.
How IUC works
IUC is governed by the CIUC (Código do IUC). Passenger cars registered after July 2007 fall under Categoria B:
- Cilindrada component - looked up from a bracket table based on engine displacement. Higher cc = higher bracket.
- CO₂ component - different bracket tables for gasoline vs diesel; diesel ranges kick in earlier.
- Age coefficient - 1.0 for cars registered this year or last, dropping to 0.7 for cars over 5 years old (older cars pay less, as a counter-balance to higher emissions).
- Fuel coefficient - diesel ×1.18 (compensates for diesel's higher real-world emissions), gasoline/hybrid ×1.0, fully electric exempt.
The result is (Cilindrada + CO₂) × age × fuel.
When and how to pay
- Due in the month of your car’s registration anniversary (the matrícula date) each year — not your birthday, and not a fixed calendar date. A calendar reform moves everyone to fixed spring dates in 2027–2028.
- The payment document (DUC) appears on the Portal das Finanças only — there is no reliable paper reminder, so set your own.
- Pay via Multibanco reference, MB WAY, or direct debit. Setting up direct debit avoids surprise misses.
- Late payment brings interest plus a fine that scales with the delay — and unpaid IUC resurfaces at inspection (IPO) and any ownership transfer.
See the payment + direct debit guide for the step-by-step, and the full IUC guide for the 2027–2028 calendar reform, cancelling a wrong payment, and exemptions.
Don't miss the IUC window
Get an email before IUC is due.
IUC is due every year in the month of your registration anniversary. Easy to forget. Get a plain-English heads-up before each Portuguese tax deadline, plus a new guide every 2 weeks. About 1-2 emails per month.
2026 rates — last verified against official sources (Portal das Finanças, Segurança Social, Diário da República).