The main change in the new IUC law is that the tax will no longer be paid in the month of vehicle registration , but this measure is expected to come into force only in 2026.
The Single Circulation Tax (IUC), popularly known as the "car stamp", is about to undergo significant changes as announced by the government. These new rules are part of the Agenda for Tax Simplification and seek to make the IUC payment process more accessible and less bureaucratic for taxpayers.
New IUC rules
The main change is that the IUC will no longer be paid in the month of vehicle registration. Instead, the deadline for the settlement of this tax will be until February. This means that vehicle owners will have the whole year to pay the IUC, which can help avoid forgetfulness and facilitate financial management.
If the IUC exceeds 100 euros , it will be paid in two instalments. This measure aims to give taxpayers greater flexibility.
How to pay the IUC?
To pay the IUC, taxpayers must access the Finance Portal (AT), taxpayers must access the , where it is possible to obtain the necessary document for payment. Payment can be made by MBWay, ATM, homebanking or at a CTT counter.
On the Finance Portal:
Access the Finance Portal, authenticate yourself with the Mobile Key, taxpayer and password of the Tax Office or the Citizen Card.
As soon as you enter the Finances you will find a section called "IUC-Issue document", select it.
Subsequently, you will see the various categories of the vehicle (A, B, C, D, E, F and G). Select the one that applies to your:
Click on the registration and, later, on "Emitir" and then on "Emitir para pagamento".
Select the option "Imprimir o documento" and you can pay by MBWay or use the references for payment at the ATM, homebanking or CTT counter.
What is the price to pay for the Single Circulation Tax (IUC)?
The amount payable for the Single Circulation Tax is calculated through the vehicle category, the date of registration, the cylinder capacity and the fuel/carbon dioxide emission levels are also used to calculate the amount to be paid.
For more information see the código do IUC.
The new IUC law is estimated to be applied in 2026.
What is the fine for not paying the IUC?
If you have exceeded the deadline for payment of the Single Circulation Tax (IUC), you will be subject to a minimum fine of 25 euros. The more time passes, the higher the amount of the fine.
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