How to obtain the IUC (Single Circulation Tax – the tax owed by people or
entities that have cars, pleasure boats or aircraft registered in their name).
Payment of the Single Circulation Tax (IUC) is annual.
In the first year of registration, including imported vehicles, the IUC must be paid within 30 days after the end of the legal deadline for vehicle registration.
If you purchased the vehicle first-hand from a car dealership, payment is made at the time of purchase.
In other cases, the IUC must be paid during the month in which the vehicle is registered, until the owner ceases to be the owner or until the registration is cancelled.
In the case of pleasure boats and aircraft, the IUC must be paid in January.
The document with IUC payment details can be requested online or at a Finance service desk.
You can pay the IUC via MBWay when ordering online, or after issuing the document, via Homebanking or ATM. You can also pay at a CTT counter or at a Finance service counter.
Here we will explain step-by-step how to obtain the document with payment details directly from the finance portal, without leaving home and completely free of charge.
Like this:
1 – Access the Finance Portal.
2 – Authenticate with your access data (TIN and Password or Digital Mobile Key).
3 – Search for “IUC”.
4 – Click on “Access” in the search results that refer to “Deliver Current Year”.
5 – Select the vehicle category and click “Search”.
6 – Select the registration number for which you want to issue the document and click “Issue”.
7 – After checking the data, click on “Issue for payment”.
8 – You now have the payment details that you can use to make the payment conveniently at home, through MBWay or Homebanking, or pay at an ATM, CTT or at a Tax Authority service desk.
Source: https://www.homepagejuridica.pt/infojus/infojus/12012-iuc-como-obter-o-documento-de-pagamento-no-portal-das-financas