How to Apply for a NISS Online in Portugal (2025 Guide)

INLIS Consulting
May 30
2 min read

If you're a foreign national residing in Portugal, whether as an employee, freelancer, or visa holder, you'll need a NISS (Número de Identificação da Segurança Social) to access social security benefits, including healthcare, pensions, and unemployment support.

NISS online in Portugal

Learn how to apply for your NISS online in Portugal with this step-by-step guide. Get your Social Security Number (NISS) easily as a resident, freelancer, or worker in Portugal.

Who Needs a NISS?

You must apply for a NISS online in Portugal if you are:

Employed by a Portuguese company
Self-employed or a freelancer
Applying for a residence permit (e.g., D7, Digital Nomad, or D2 Visa)
Seeking access to public healthcare or pension systems

Step-by-Step: How to Apply for a NISS Online

1. Gather Required Documents

Prepare digital copies (PDF format) of the following:

Valid ID: Passport, EU national ID card, or residence permit
Portuguese Tax Number (NIF): Mandatory for all applicants
Proof of Employment or Activity:
- Employment contract (for employees)
- Declaration of commencement of activity or company registration (for self-employed individuals)

Proof of Residence: Rental contract or utility bill
For Legal Representatives: Power of attorney and representative's ID

Note: Ensure all documents are clear and legible.

2. Access the Official Application Portal

Visit the Portuguese Social Security Portal and navigate to:

"Sou Cidadão" (I am a Citizen)
Select "Atribuição de Número de Identificação de Segurança Social (NISS)"
Click on "Formulário para pedido de Número de Identificação de Segurança Social"

Alternatively, you can access the application form directly through the ePortugal portal.

3. Complete the Online Form

Fill in the application form with accurate personal details:

Full name
Date of birth
Nationality
Marital status
Type and number of identification document
Taxpayer number (NIF)
Contact information (email and phone number)

Attach the prepared documents in the designated sections.

4. Submit the Application

After reviewing all information and ensuring all documents are attached:

Apply through the portal.
You will receive a confirmation email acknowledging receipt of your application.

5. Await Processing

Processing times can vary, but typically:

Standard processing: 5 to 10 business days
Delays may occur during peak periods or if additional information is required

You will receive an email notification once your NISS is assigned.

Important Notes

No Fees: Applying for a NISS is free of charge.
Legal Representatives: If applying on behalf of someone else, ensure all authorization documents are included.
In-Person Collection: In some cases, you may be required to collect your NISS in person at a Social Security office. Bring your ID for verification.