If you cannot find your NIF (número de identificação fiscal), the reassuring news is that it has not gone anywhere. The NIF is permanent: it never expires and never changes, so the number you were issued is still yours. It is always nine digits — no letters, no dashes. Here is where to find it, and how to get an official copy if you have misplaced every record.
Where your NIF is written down
Your NIF appears in several places you may already have:
- On the registration sheet the Tax Authority issued when your NIF was created
- On any letter or assessment from Finanças (the Tax Authority)
- Inside your account on the Portal das Finanças, once you log in
- On the comprovativo de NIF — the official certificate you can download free from the portal
- Printed on the Cartão de Cidadão, for Portuguese citizens
Downloading the official comprovativo
The comprovativo de NIF is the document most institutions accept as proof of your tax number. Once you are logged in to the Portal das Finanças you can download it free of charge, and it is the cleanest way to confirm the exact number and the name it is registered under. If a bank, landlord or employer asks you to “prove your NIF”, this is the document they mean.
If you cannot log in or find any record
Two things are worth separating: the NIF itself (the nine-digit number) and the Portal das Finanças password (the senha that lets you log in). If you have the number but not the password, you can request a new access password on the portal — it is sent by post to the address the Tax Authority has on file, which for a non-resident with a representative is the address of your fiscal representative. If you have lost the number entirely, you can retrieve it at any tax office, or by calling the Tax Authority support line, or — often the fastest route — by asking whoever originally obtained the NIF for you.
Non-residents: your representative can help
If you obtained your NIF remotely as a non-resident with a fiscal representative, your representative holds the registered Portuguese address and receives the Tax Authority’s correspondence, including the access password. That makes them the natural first point of contact if you have lost track of your number or cannot access the portal from abroad.
Do not have a NIF yet?
If you are here because you never had one to begin with, the NIF is straightforward to get — issued free by the Portuguese State, obtained entirely online in 5–14 working days with NIF Express, at €49.99 including the first year of fiscal representation. Start your application, or learn what a NIF is.
Frequently asked questions
Can my NIF expire or change?
No. The NIF is permanent — it never expires and never changes. The number you were issued is yours for life.
How do I get official proof of my NIF?
Download the comprovativo de NIF free from your Portal das Finanças account. It is the certificate banks, landlords and employers accept as proof.
I forgot my Portal das Finanças password — is that the same as losing my NIF?
No. The number and the login password are separate. You can request a new access password on the portal; it is sent by post to the address on file.
How many digits is a NIF?
Nine digits — no letters and no dashes. If what you have is longer or contains letters, it is not the NIF.
I obtained my NIF through a service — who do I ask?
Your fiscal representative holds the registered address and the Tax Authority correspondence, so they are usually the fastest way to recover the number or the access password.
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