Valid Passport or ID
A current and valid identification document is required to start the application.
Required for work in Portugal
Needed for tax and social contributions
Grants access to healthcare & benefits
Essential for employment contracts
Mandatory for both EU and non-EU residents
Issued by Social Security authorities
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A current and valid identification document is required to start the application.
You must provide a residential address, either in Portugal or abroad, for official correspondence.
For non-EU residents, a valid visa or residence permit is required.
Authorities request proof of why you need a NISS, such as an employment contract, self-employment, or enrollment in studies.
Applications are filed with the Instituto da Segurança Social, either in person or via a representative.
In most cases, you must already hold a Portuguese tax number (NIF) before applying for a NISS.
We manage the complete NISS application process for you. From preparing the documents to liaising with the authorities, we make sure your application is filed correctly and on time.
Personalized case assessment
Verification of NIF and eligibility requirements
Preparation & submission of application forms
Filing at the Social Security office
Follow-up until your NISS is issued and confirmed
One dedicated contact throughout the processLegal know-how meets lived experience. We are a cohesive team of expats and local lawyers combining international perspective with on-the-ground expertise - guiding you through every step with empathy, clarity and confidence.
Head of Legal Portugal
