If I renew my passport after getting my NIF, do I need to update the Portugal Tax Office?

No, the Portuguese Tax Office office does not need you to update your passport on file.

But if you would like to anyway, you can do so by submitting a request on Portal das Finanças. Here are instructions on how to do so:

1. Go to this URL: https://www.portaldasfinancas.gov.pt/pt/formularioContacto.action, enter your login credentials, and click the "Autenticar" button

   

2. You should end up on this screen, which is also known as "e-balcão"). Translation: e-counter. This is the Portuguese Tax Office's online help counter where you can complete a variety of tasks.

   

3. Scroll down until you see a blue "Registar Nova Questão" button and then click on it. Translation: "Register new question"

   

4. You will end up on this screen, which is the form that you need to fill out to put in a request.

   

5. Time to fill out the form.
   For the first set of dropdown fields, please select the following:
   Imposto ou área = Registro Contribuinte
   Tipo de questão = Identific
   Questão = Atrib/Alter NIF-Singulares

   

6. Fill in the text field labeled Assunto (Subject), Mensagem (Message), and attach a PDF file of your new passport.
7.  Click the blue "Registar Questão" button to send the request. Translation: "Register question"

That's it! You should receive confirmation over the next few days.