What is a NISS and who needs one
What the Portuguese social security number is, what it is used for, who needs one and who does not, explained from the official rules.
Read the guide · 6 min read
Guides
NISS Portugal guides
Researched guides by Mariana Santos on the Portuguese social security number: what it is, how each route works, and the mistakes that delay applications.
NISS vs NIF vs Utente: the three numbers explained
Portugal uses three separate identity numbers. What each one is, who issues it, what it is for, and the order to get them in.
Read the guide · 5 min read
How to get a NISS as a self-employed worker (recibos verdes)
The self-employed NISS route step by step: NIF first, opening your activity, issuing receipts, and the first year contribution exemption.
Read the guide · 7 min read
NISS for employees: the contract catch-22 and how employers file
Why the contract must come before the NISS, how employer filing works, and what to do when an employer insists on the number first.
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Seguranca Social Direta: activate your account and set your password
How to register for Seguranca Social Direta with your NISS, get your verification code, set a password, and what you can do inside the portal.
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The July 2026 AIMA automatic NISS: who gets one and who still needs to apply
Since late July 2026 AIMA processes assign a NISS automatically. Who that covers, who it leaves out, and when applying directly is still the right move.
Read the guide · 6 min read