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AIMA & Immigration

Moving to Portugal?

Understand the documents, procedures and first steps you may need.

Last reviewed: 29 September 2026

Orientation only. Procedures and requirements can be changed by the Portuguese authorities at any time. Official information always prevails. Decide Portugal is not a substitute for AIMA or for legal advice.

Official source → summary → link

Key topics

01

AIMA — what it is

Official source: AIMA — Agência para a Integração, Migrações e Asilo

  • AIMA is the Portuguese public agency responsible for migration, residence permits and asylum matters.
  • It took over the immigration and residence functions previously handled by SEF in 2023.
  • Residence applications, renewals and appointments for foreign citizens are handled through AIMA channels.
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02

NIF — tax number

Official source: Portal das Finanças (Autoridade Tributária)

  • The NIF (Número de Identificação Fiscal) is the Portuguese tax identification number.
  • It is commonly needed to rent, open a bank account, sign contracts or buy property and cars.
  • Check on Portal das Finanças whether you need a tax representative, which depends on your residence situation.
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03

NISS — social security number

Official source: Segurança Social

  • The NISS (Número de Identificação da Segurança Social) identifies you in the Portuguese social security system.
  • It is usually required to work, be self-employed or access social security benefits.
  • Segurança Social explains how foreign citizens can request it and which documents apply.
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04

Residence registration & permits

Official source: AIMA

  • EU/EEA/Swiss citizens and non-EU citizens follow different residence procedures.
  • EU citizens staying longer than three months generally register their residence with the local municipality (Câmara Municipal).
  • Non-EU citizens apply for the residence permit type that matches their visa or situation — requirements differ by permit type.
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05

Appointments with AIMA

Official source: AIMA — appointments and contacts

  • Appointments and online services are announced on the official AIMA website.
  • Use only official AIMA channels; do not pay third parties who promise faster appointments.
  • Keep every confirmation email, reference number and receipt you receive.
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06

Renewing documents

Official source: AIMA

  • Residence permits have an expiry date and must be renewed through AIMA procedures.
  • Check the official AIMA website well before expiry for the current renewal channel and any temporary validity extensions.
  • Renewal requirements depend on your permit type — confirm them for your case.
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Checklist

First steps after arriving

  1. 01Check the entry and visa rules that apply to your nationality before travelling.
  2. 02Get a NIF (tax number) from the Autoridade Tributária.
  3. 03Arrange proof of address (rental contract or equivalent).
  4. 04Request a NISS if you will work or be self-employed.
  5. 05Register residence (EU citizens) or follow your AIMA residence permit procedure (non-EU).
  6. 06Register with your local Centro de Saúde to get a Número de Utente (SNS).

What to bring to an appointment

  • Valid passport or national ID card (original)
  • Appointment confirmation and any reference numbers
  • Visa, if applicable
  • Proof of address in Portugal
  • NIF and, where applicable, NISS
  • Documents specific to your permit type (e.g. work contract, proof of means, enrolment) — confirm the list on AIMA
  • Copies of every document, in addition to originals

General checklist. The exact list depends on your permit type — confirm it on aima.gov.pt.

FAQ

Frequently asked questions

Is Decide Portugal an official AIMA service?

No. Decide Portugal is an independent orientation guide. We do not submit applications, book appointments or represent you before any authority.

Which document list is correct?

Always the one published by AIMA or the relevant public entity for your specific permit type. Requirements can change and the official information prevails.

Do I need a lawyer?

Not always, but for complex cases (refusals, family reunification, irregular status, appeals) consider a lawyer registered with the Ordem dos Advogados.

Where do I start if I have none of these numbers?

Most people start with the NIF, then proof of address, then NISS and the residence procedure. Your situation may require a different order.

Official sources

Always check the official websites

Last reviewed: 29 September 2026

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