Almost nothing in Portugal happens without a NIF and a NISS — renting, banking, working, healthcare, AIMA. Here is what each one is, how to get them, and the order to do it in.
The NIF (Número de Identificação Fiscal) is your Portuguese tax number, issued by Finanças. You need it to rent, open a bank account, sign contracts, buy a SIM, and almost any official transaction. It is usually the very first thing to sort out.
The NISS (Número de Identificação de Segurança Social) is your social security number, issued by Segurança Social. You need it to work legally, register employment, and access certain benefits and family support.
The NIF itself is free at Finanças; representation services charge a fee.
Once you are in Portugal (or starting work), you request a NISS from Segurança Social — online through Segurança Social Direta or in person, with your NIF, ID and residence details. Employers often need it before your first day, so it is worth doing early.
Order matters: NIF first (everything depends on it), then bank account, then NISS when you are ready to work or access benefits.
Procedures and requirements change — check the official Finanças and Segurança Social channels for the current process. This is general information, not tax or legal advice.
Getting a NIF and NISS means Portuguese forms, offices and phone calls. Calma handles the appointments, paperwork and follow-ups in Portuguese — often starting before you arrive. See our relocation help, or planning the tax side? Our sister site Portugal Tax Calculator covers IRS and the NHR/IFICI regime.
Yes. Many people get a NIF remotely through a fiscal representative or lawyer before they arrive, which lets you open a bank account and sign a lease as soon as you land.
If you are tax-resident outside the EU/EEA and don't yet have residence in Portugal, you generally need a fiscal representative to get a NIF. Once you become resident you can usually remove them.
Getting the NIF at Finanças is free. You only pay if you use a fiscal representative or a service to obtain it for you.
The NIF is your tax number (Finanças); the NISS is your social security number (Segurança Social). You need the NIF for almost everything; the NISS mainly to work and access benefits.
NIF first — banking, renting and the NISS itself all depend on it. Then a bank account, then the NISS when you're ready to work.
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