NISS Portugal: Your Social Security Number

The NISS (Numero de Identificacao de Seguranca Social) is your Portuguese social security number. You need it if you are going to work in Portugal, whether as an employee, freelancer, or self-employed. It is also required for accessing healthcare through the SNS (national health system) and for applying for social benefits.

Who needs a NISS?

Anyone who works or plans to work in Portugal. If you are a retiree or digital nomad not working for a Portuguese entity, you may not need it immediately, but it is useful to have for healthcare access.

Step-by-step

1. Get your NIF first. You cannot apply for NISS without it.
2. Locate your nearest Seguranca Social office or Loja do Cidadao.
3. Book an appointment if possible (segurancasocial.pt or by phone).
4. Bring: valid ID, your NIF, proof of address in Portugal, and proof of employment or self-employment activity (contract, or declaration of activity from Financas for freelancers).
5. Complete the registration form at the counter.
6. Receive your NISS, usually issued on the spot or within a few days.

For freelancers (recibos verdes)

If you are opening an activity as a freelancer (opening "actividade"), you register at Financas first, then go to Seguranca Social with the Financas declaration to get your NISS.