NISS in Portugal: how to get your social security number — 2026 guide
The NISS is requested online, free of charge, and is mandatory for working in Portugal. Here are the documents you need, how the process works for foreigners and how long it takes.
The NISS — Portugal’s social security identification number — is requested online through a form on the Segurança Social portal, and it is free. It is the number that identifies you to the Portuguese social protection system: without it there are no contributions, no declared work contract, no benefits and, eventually, no pension. For anyone arriving in Portugal to work, it is one of the first numbers of your bureaucratic life — right after the NIF.
Who needs a NISS?
Everyone who works or pays contributions in Portugal: employees, the self-employed (recibos verdes), employers and benefit recipients. Portuguese citizens get a NISS automatically with their Citizen Card; foreign citizens have to request the number — and since the process moved online, the dawn queue outside a branch office is no longer part of the deal.
What documents do you need to request a NISS?
For foreign citizens, the request requires three blocks of documents, all scanned:
Valid identification — passport, residence permit or authorisation (temporary or permanent) or work visa, valid at the time of the online request.
Proof of your work situation — for example a contract or promise of contract, if you are applying in order to take up employment.
Proof of residence or of a pending regularisation request — this can be the receipt of your residence-permit application or, for CPLP citizens, proof of the visa application or of the CPLP residence certificate request. If you have a process running with AIMA, that receipt is exactly what this asks for — we’ve explained how the CPLP residence permit works and what sets it apart.
How does the online request work?
On the Segurança Social portal, you fill in the NISS request form for foreign citizens and attach your documents. The official route, with the up-to-date form and practical guide, is on the service page at gov.pt. Once submitted, you will receive a registered letter at the address you provided confirming the NISS has been assigned and can be collected at a social security service desk, presenting the ID document used in the request.
With the NISS in hand, the next step is activating Segurança Social Direta — the personal online area where you check contributions, declare activity and handle almost everything without queues.
Frequently asked questions
How much does the NISS cost?
Nothing. The request and assignment are free — be wary of websites charging to “handle” the process.
Can I work while waiting for my NISS?
Your employer needs your NISS to register you with social security before you start work, so make the request as soon as you have a contract or promise of contract in hand.
Are the NISS and NIF the same thing?
No. The NIF is the tax office number; the NISS is the social security number (contributions and benefits). You will need both — the NIF, in fact, is the first piece of paper every newcomer should sort out.
Does the NISS expire?
The number is for life. What can expire are the documents linked to it — keep your residence permit valid and your details updated in Segurança Social Direta.
Image: El Pantera / Wikimedia Commons (CC BY-SA 4.0)