Portuguese Tax Identification Number (NIF) | Portugal’s Tax Equivalent to the U.S. SSN

The Tax Identification Number – NIF* (also called Número de Contribuinte) is a sequential number attributed to the citizen to identify him/her before the Portuguese Tax Authorities. In comparative terms, the NIF in Portugal is functionally equivalent, for tax purposes to the SSN- Social Security Number in America. Therefore, the NIF is mandatory for citizens who are subject to obligations or who wish to exercise their rights before the Portuguese Tax and Customs Administration.

*Last updated: January 2026

The NIF can be obtained by any citizen, national or foreign, resident or not in Portugal, under the rules currently in force. The most common cases of application, and the respective necessary documentation, are as follows:

1. Application by the person concerned, residing in Portugal. At the time of application, the following documents must be submitted:
   (i) the passport of the applicant and
   (ii) proof of residence of the applicant in Portugal.The NIF can be obtained by any citizen, national or foreign
   
2. Application by the interested party, not resident in Portugal. In this case it is necessary to appoint a “tax representative” residing in the country. Thus, at the time of the application, the following must be presented:
   (i) the passport of the interested party,
   (ii) the proof of residence of the interested party in the country of residence,
   (iii) the declaration of acceptance of tax representation signed by the tax representative,
   
3. Application by the “tax representative” of the interested party, the latter not resident in Portugal. At the time of the application must be presented
   (i) a specific power of attorney for the purpose signed by the interested party,
   (ii) a certified copy of the passport of the represented/interested party,
   (iii) proof of residence of the represented/interested party in country of residence,
   (iv) declaration of acceptance of tax representation signed by the tax representative, (v) the passport or identification card of the tax representative,
   (vi) proof of residence of the tax representative in Portugal.

It’s important to note that if you obtained your NIF with the help of a tax representative, after residing in Portugal for a few months, you can cancel the tax representation linked to your name and NIF. All you need to do is provide proof of residence, such as a lease agreement or a certificate issued by the parish council.

Where to request the NIF

The request can be made at the service counters of the Autoridade Tributária e Aduaneira, the counters of the Lojas do Cidadão that provide the service, as well as the counters that provide the Citizen’s Card (Cartão de Cidadão). The issuance of the document is free.

If you don’t reside in Portugal and need help obtaining your NIF remotely, we recommend hiring the services of a specialized company like Atlantic Bridge. Our team of experts is qualified and authorized to act as a legal representative. We handle your request with care and professionalism.

Want to organize your finances in Portugal? Schedule a tax consultation now!

What is the NIF used for?

The NIF is an essential number for a variety of transactions and legal situations. It is required in financial operations, contracts, employment, renting, invoice issuance, opening bank accounts, property purchases, tax payments, among others. It serves as personal tax identification and is vital for participation in the country’s economic life. It is the first step for those intending to invest, live, work, or study in Portugal.

Need help obtaining your Portuguese NIF as a non-resident? Talk to our specialists and start your process today.

*The information contained in this Article shall be provided in a general and abstract manner and shall not replace consultation and qualified professional assistance addressed to the specific case. The content of this article may not be reproduced, in whole or in part, without the express permission of the author.