AIMA and Social Security Clarify Employment of Foreign Citizens Without NISS Number

7 January 2025

On 27th December 2024, Portugal's Social Security announced an important clarification regarding the employment of foreign citizens residing in Portugal. Companies are explicitly allowed to hire foreign workers even if they do not yet possess a Número de Identificação de Segurança Social (NISS), commonly referred to as a Social Security Number.


This clarification acknowledges the practical challenge faced by foreign residents and employers. 


The employment contract is a prerequisite for assigning a NISS number to a foreign citizen. Therefore, the employment contract doesn't need to include the NISS number in the contract itself.


Once the foreign worker has been assigned a NISS number, the employer must report the employment relationship through the Segurança Social Direta (Direct Social Security) online platform of Portuguese Social Security. This procedure ensures the regularisation of tax obligations, specifically the payment of social security contributions.


This clarification from Portuguese Social Security comes at a critical time, as immigration in Portugal has become a significant focus, particularly within the national job market. The primary objectives of this statement are to promote regularisation, facilitate integration, and ensure fair working conditions for foreign workers. Simultaneously, the Portuguese labour market benefits from having these workers regularised, as their contribution is essential to addressing the country’s workforce demands.


One week later, on 4th January 2025, the AIMA agency reinforced this message with a similar announcement through a post on their LinkedIn page.


AIMA's post emphasised that an employment contract is a mandatory requirement to obtain the NISS number. Without a valid employment contract, it is not possible for a foreign citizen to acquire the NISS number. In essence, securing an employment contract is a crucial step before obtaining the NISS.


Once the NISS is assigned by Social Security, the foreign citizen becomes eligible to fulfil the legal obligations established under Law No. 23/2007 with AIMA IP.


This clarification made by these two public entities represents a significant step towards streamlining the immigration process for individuals seeking employment with Portuguese companies. Additionally, it strengthens the Portuguese business landscape by offering clear legal guidance and promoting the integration of these workers into the Portuguese job market.

The NISS number, or Portuguese Social Security Number, serves as a unique identifier for individuals working in Portugal, including employees and self-employed professionals such as freelancers.


The NISS number is utilised for social security and taxation purposes.


Upon acquiring Portuguese citizenship, the NISS number is automatically assigned as part of the process for obtaining the Citizen Card.



If you require assistance with obtaining your NISS or have other inquiries related to Portuguese Social Security processes, don’t hesitate to reach out to us. We are here to provide expert guidance and support.

by Joana Loureiro Veríssimo 28 July 2025
Joana Loureiro Veríssimo | Lawyer
24 July 2025
A new National Unit for Foreigners and Borders (UNEF) has been created within the Public Security Police (PSP), taking over key responsibilities from the former SEF. UNEF will handle airport border control, visa issuance, foreign nationals oversight, and related operations.
by Danielle Avidago 18 July 2025
Danielle Avidago | Immigration Consultant
Short-term leases are lawful in Portugal if legal and factual rules are observed.
by Tomás Melo Ribeiro 17 July 2025
Due to stricter AL rules in urban Portugal, many owners now turn to short-term residential leases to earn legal rental income outside tourist accommodation laws.
On 16 July 2025, the Portuguese Parliament approved major changes to immigration law
16 July 2025
On 16 July 2025, the Portuguese Parliament approved major changes to the legal framework governing immigration (Law no. 23/2007). The reform ends the manifestação de interesse mechanism, tightens rules for job-seeker visas and family reunification, and sets a final deadline for transitional applications.
11 July 2025
The Portuguese Parliament has decided to postpone the vote on the proposed amendments to the Nationality Law until September 2025. The decision was taken in a meeting of the Committee on Constitutional Affairs, Rights, Freedoms and Guarantees, following pressure from several political parties who requested more time to assess the implications of the proposed reform. The delay allows for additional hearings with legal experts, immigrant associations and civil society representatives before a final vote is held in plenary session. The proposed reform introduces significant changes to the current legal framework for acquiring Portuguese nationality. Among the most impactful measures is the extension of the minimum legal residence period required before applying for naturalisation. Under the new proposal, this period would increase from the current five years to seven years for nationals of CPLP countries (Community of Portuguese Language Countries), and to ten years for applicants from all other countries. Another major change concerns the introduction of mechanisms to revoke Portuguese nationality . According to the proposal, naturalised citizens who are convicted of serious crimes — defined as those resulting in prison sentences of five years or more , within ten years of acquiring nationality — could see their Portuguese citizenship revoked by a court decision, based on a proposal from the Public Prosecutor’s Office. In addition, the reform would tighten the requirements for acquiring original Portuguese nationality through birth in Portugal. For children born in Portuguese territory to foreign parents, it would become mandatory that at least one parent has been residing legally in Portugal for a minimum of three years , instead of the current two years. Although the government initially intended to approve these changes before the summer recess, political consensus has not yet been reached. Left-wing parties have raised concerns regarding the constitutionality of retroactive revocation of nationality and the potential impact on the rights of long-term residents and immigrant communities in Portugal. In response, the parliamentary committee agreed to postpone the process and schedule a new round of expert hearings in early September. A final vote on the reform is now expected to take place later that month. Until then, the current version of the Nationality Law remains in force , including the five-year legal residence requirement for naturalisation. Applicants who meet this requirement and wish to apply under the current rules may still do so in the coming weeks.
Get a residence permit in Portugal via the EU Blue Card for skilled professionals.
by Sara Sbai Oliveira 11 July 2025
Law No. 53/2023 transposes the EU Blue Card Directive into Portuguese law, improving conditions for highly skilled non-EU nationals to live and work in the EU.
Portuguese law offers remedies, but claiming them requires legal and procedural know-how.
by Margarida Tempera 8 July 2025
Hiring a contractor in Portugal should be simple, but unmet terms can lead to financial loss and legal issues, especially for clients unfamiliar with local rules.
When an individual considers securing European citizenship, one country often stands out: Portugal.
by Danielle Avidago 7 July 2025
Portuguese nationality law requires more than just having a Portuguese spouse or grandparent—it also demands proof of a meaningful connection to Portuguese society.
More posts