This article on paperwork when moving to Portugal covers the administrative steps that sit between arriving and being properly set up. Social security registration, legalising foreign documents, criminal record certificates, bringing pets, shipping your belongings, enrolling children in school, and the payment system you will use every day.

None of it is difficult. All of it takes longer than you expect if you start it after you land rather than before.

NISS, your social security number

The NISS, Número de Identificação de Segurança Social, is a separate number from your NIF. The NIF is tax. The NISS is social security.

You need a NISS if you are going to work in Portugal, whether employed or self-employed, and you need it to access social security benefits, parental leave and the state pension system. Registering with the SNS for healthcare is a third and separate process again, done at your local Centro de Saúde.

How to get it. If you are employed, your employer normally requests it when they register your contract. If you are self-employed or the employer has not done it, you apply through Segurança Social Direta online, or in person at a Loja de Cidadão or a Segurança Social office.

What you need: passport or ID card, NIF, residence permit or CRUE, and proof of address. Processing typically takes a few working days when the file is complete.

A point that catches people out. Self-employed workers, trabalhadores independentes, get a twelve month exemption from social security contributions from the date activity starts, then contributions begin. Budget for the moment the exemption ends rather than being surprised by it.

Legalising foreign documents

Portuguese authorities will not accept most foreign official documents as they are. Two steps are usually required, and they happen in this order.

Apostille or consular legalisation

An apostille is a certificate attached to a document by the issuing country, confirming the signature and seal are genuine. It is issued under the 1961 Hague Apostille Convention.

If your country is party to the Convention, which covers the US, the UK, Canada, Australia, Brazil and most of Europe, you need an apostille. Who issues it varies: the Foreign Office in the UK, the Secretary of State at state level in the US, Global Affairs in Canada.

If your country is not party to the Convention, you need consular legalisation instead, done through the Portuguese consulate in that country. It is slower and usually more expensive.

Get apostilles before you leave. Obtaining one for a document held in another country while you are living in Portugal is a slow and irritating process.

Sworn translation

Once apostilled, the document must be translated into Portuguese by a translator whose signature is certified. In Portugal this is done through a notary, a lawyer, a solicitador or a Portuguese consulate, who certifies the translation rather than performing it.

Portugal does not operate a register of sworn translators in the way Spain or Germany does. The translation is validated by certification, not by the translator's own status. A translation certified abroad by a Portuguese consulate is accepted here.

Which documents typically need this

Birth certificates
Marriage certificates, and divorce decrees where relevant
Criminal record certificates
Academic diplomas and transcripts, for professional recognition or school enrolment
Powers of attorney
Death certificates and wills, in inheritance matters

Criminal record certificate

Visa applications and residency applications require a criminal record certificate from every country where you have lived for more than one year since turning sixteen.

Most certificates are only valid for three months from issue, so timing matters. Request them close to when you will submit, not months in advance, and account for the apostille and translation time inside that window.

Where to get one: the FBI Identity History Summary in the US, ACRO in the UK, the RCMP in Canada, the Polícia Federal in Brazil. Processing times vary from days to several weeks.

AIMA will also request a Portuguese criminal record certificate, the certificado de registo criminal, which you authorise them to obtain directly rather than supplying yourself.

Bringing pets

Portugal follows EU rules. Dogs, cats and ferrets need four things.

A microchip meeting ISO standard 11784 or 11785. It must be implanted before the rabies vaccination, or the vaccination does not count.
A rabies vaccination given after the microchip. It takes effect 21 days after the first dose, and the animal cannot travel until that period has passed.
An EU pet passport if travelling from another EU country, or an EU animal health certificate issued by an official vet within ten days of travel if arriving from outside the EU.
A rabies antibody titration test if arriving from a country classified as high risk. The blood sample must be taken at least 30 days after vaccination, and the animal cannot travel until three months after the sample date.

That last requirement is the one that ruins timelines. From a listed high-risk country, the total lead time from first vet visit to travel is around four months. Check your country's classification early.

Airlines have their own rules on cabin against hold, crate dimensions and breed restrictions, and snub-nosed breeds face restrictions on many carriers.

After arrival, register the animal with your junta de freguesia. Dogs must be licensed locally and the licence is renewed annually.

Shipping your belongings

If you are moving from outside the EU, personal belongings can enter Portugal free of import duty and VAT under transfer of residence relief, the regime known as transferência de residência.

The conditions are strict:

You must have lived outside the EU for at least twelve consecutive months
You must have owned and used the goods for at least six months before the move
The goods must arrive within twelve months of you establishing residence in Portugal
You must not sell or transfer them for twelve months after import
You need a detailed inventory, valued, in Portuguese

The application goes to Autoridade Tributária e Aduaneira with proof of your previous residence and proof of your new one. Most people use a despachante oficial, a licensed customs agent, because errors on the inventory cause delays and charges.

Vehicles have their own regime, covered separately under owning a home and running a car.

Moving from another EU country involves no customs process at all. Goods move freely.

Enrolling children in school

School is compulsory in Portugal from age six to eighteen. Public schools are free and generally good, and they teach entirely in Portuguese.

Public school

Enrolment happens through the Portal das Matrículas, using your Chave Móvel Digital or Portal das Finanças credentials. The main enrolment window runs in the spring for the following September, but children arriving mid-year are placed through the local school grouping, the agrupamento de escolas.

You will need: the child's identification, NIF for the child and the parent, proof of address, the vaccination record, boletim de vacinas, and previous school records translated into Portuguese.

Children who do not speak Portuguese are entitled to support through the Português Língua Não Materna programme. Availability and quality vary by school. Younger children generally absorb the language within a year. Teenagers arriving at secondary level find it much harder, and that is the age group where families most often choose private international schooling instead.

International school

International schools follow British, American, IB, French or German curricula and teach in the relevant language. They are concentrated in Lisbon, Cascais, the Algarve, Porto and Funchal, and they are thin on the ground elsewhere.

Places at the well-known schools are limited and waiting lists are real. Apply early, well before you have an address, and ask specifically about entry points, because some schools only admit at certain year levels.

Fees are the single largest variable in a family budget in Portugal. Regional fee levels and availability are covered under cost of living.

Multibanco and MB Way

Portugal runs a domestic payment network that has no direct equivalent elsewhere, and understanding it early saves confusion.

Multibanco is the interbank network. The ATMs do far more than dispense cash. You can pay tax, pay utility bills, top up a phone, buy transport tickets, pay social security, and settle almost any official charge through a reference payment.

Reference payments are how most Portuguese bills work. You receive three numbers: an entity code, a reference and an amount. You enter them at an ATM or in your banking app and the payment reconciles automatically. There is no payee name to get wrong and no bank transfer to trace. Most invoices and every tax guia arrive in this format.

MB Way is the mobile layer on top. It links your phone number to your bank card and handles instant transfers between people, splitting bills, contactless payment and generating virtual card numbers for online purchases. It is used constantly and informally, including by tradespeople and small businesses.

MB Way requires a Portuguese bank account and a Portuguese phone number. Revolut, Wise and N26 do not connect to it. This is one of the practical reasons a Portuguese account is not optional, however well the digital alternatives work for everything else.

The order that works

Sequence matters, because each step unlocks the next.

Apostille and translate documents while you are still in your home country
Criminal record certificate, timed to the three month validity window
NIF, before the visa application
Visa
Arrival, then the AIMA appointment for the residence permit
Portuguese bank account, then MB Way
Register your address at the junta de freguesia
NISS if you will be working
Register at the Centro de Saúde for SNS access
School enrolment, though international school applications should start much earlier

Steps one and two are the ones people leave until they have arrived, and they are the two that are hardest to complete from Portugal.