When you move to Portugal, you will often hear about three identification numbers:

NIF
NISS
SNS user number, also called número de utente

They are not the same thing.

Each number belongs to a different public system:

NIF identifies you for taxes and financial matters.
NISS identifies you in the Social Security system.
SNS user number identifies you in Portugal’s public healthcare system.

You may need all three numbers, but you do not always need to obtain them at the same time.

Portugal also offers a combined service that allows some foreign residents to request all three numbers in one appointment.

This guide explains:

What each number is used for
Who can request it
Which documents may be required
Where to apply
How the combined procedure works
Which order is most practical
What each number does not give you

Important: NIF, NISS and the SNS user number are administrative identification numbers. None of them, by itself, gives you a visa, residence permit or right to stay in Portugal.

Quick comparison #

Number	Full name	Main purpose	Usually needed for
NIF	Número de Identificação Fiscal	Tax and financial identification	Banking, rent, work, taxes, contracts and business
NISS	Número de Identificação da Segurança Social	Social Security identification	Employment, contributions, benefits and self-employment
SNS number	Número Nacional de Utente	Public healthcare identification	Health centres, hospitals, prescriptions and SNS records

1. What is a NIF? #

NIF means:

Número de Identificação Fiscal

It is your Portuguese tax identification number.

It is also commonly called:

Número de contribuinte
Tax number
Portuguese taxpayer number

The NIF is issued by the Portuguese Tax and Customs Authority, known as:

Autoridade Tributária e Aduaneira

Its online portal is the Portal das Finanças.

What is the NIF used for? #

You may need a NIF to:

Open a Portuguese bank account
Sign a rental contract
Buy property
Start employment
Register as self-employed
Create a company
Pay Portuguese taxes
Receive invoices with your tax number
Sign utility contracts
Buy a vehicle
Sign insurance contracts
Use many government services
Apply for some visas or residence procedures
Register children for certain services
Make large financial transactions

In practice, the NIF is often the first Portuguese number a new arrival obtains.

Does a NIF give you residence rights? #

No.

A NIF does not give you:

A visa
A residence permit
The right to work
Access to Social Security benefits
Full public healthcare entitlement
Portuguese tax residence
Portuguese citizenship

A person can have a NIF while living outside Portugal.

For example, a foreign property owner or investor may need a NIF without becoming a Portuguese resident.

Does the NIF expire? #

No.

The number does not normally expire.

You keep the same NIF after:

Moving to Portugal
Leaving Portugal
Changing address
Changing residence status
Starting employment
Registering self-employment

Your personal data and tax status may need to be updated, but the number remains the same.

2. Who can request a NIF? #

A NIF can be requested by:

Portuguese citizens
Foreign citizens
Residents of Portugal
Non-residents
EU citizens
Non-EU citizens
Adults
Children

A person does not need to hold a Portuguese residence permit before requesting a NIF.

This is why many visa applicants obtain it before moving.

3. How to request a NIF #

There are several possible channels.

Depending on your situation, you may request a NIF:

At a Finanças office
At a participating Loja do Cidadão
Through an appointment arranged with the Tax Authority
Through a legal representative
Through the combined NIF, NISS and SNS service
Through an online request submitted by an authorised representative

Check the official service page for requesting a NIF for an individual.

Applying in person #

You may request the NIF at a Tax Authority office.

Before attending, check whether an appointment is required.

Appointments may be arranged through:

Portal das Finanças
The Tax Authority telephone service
A local Finanças office

The Tax Authority telephone number is:

(+351) 217 206 707

Opening hours may change, so check the official portal before calling.

Applying through a representative #

A legal or authorised representative in Portugal may be able to request the NIF for you.

The representative may submit the request through:

Finanças
The Portal das Finanças
e-Balcão
Another accepted Tax Authority channel

The representative normally needs:

Their own identification
Their Portuguese tax details
Your passport or identity document
Proof of your foreign address
Authorisation to act for you
Other documents requested by the Tax Authority

Do not send your passport or personal documents to an unknown online service without checking who is legally responsible for the request.

4. Documents normally required for a NIF #

Common documents include:

Valid passport
EU national identity card, where applicable
Proof of address outside or inside Portugal
Residence document, if already available
Representative’s identification
Authorisation or power of attorney, where required
Birth certificate or family document for a child

The address document may be:

Utility bill
Bank statement
Government letter
Residence certificate
Driving licence where accepted
Rental agreement
Official identity document showing the address

The document should normally show:

Your full name
Your current address
A recent date
The issuing organisation

Requirements can differ depending on whether you register as resident or non-resident.

5. Resident or non-resident NIF #

When a NIF is created, your tax record includes an address and residence status.

You may initially be registered as a non-resident if you live outside Portugal.

After moving to Portugal, you may need to update:

Tax address
Country of residence
Portuguese address
Contact details
Tax representative
Electronic notification settings

Do not confuse:

Having a Portuguese NIF
Being registered with a Portuguese address
Becoming a Portuguese tax resident

These are related but separate matters.

When do you become tax resident? #

Portuguese tax residence is determined by tax law and your real circumstances.

You may become resident if you:

Spend more than 183 days in Portugal during the relevant period, or
Maintain a home showing that you intend to use it as your habitual residence

Changing the address registered with Finanças is important, but the tax residence test depends on facts and legal rules.

6. Do you need a tax representative? #

The need for a fiscal representative depends on:

Your country of residence
Whether you live inside the EU or EEA
Whether you have Portuguese tax obligations
Whether you use electronic notifications
Your current status with Finanças

People living outside the EU or EEA may need a fiscal representative in some circumstances.

However, rules have changed over time, and electronic notifications can affect the requirement.

Do not keep paying for a representative only because an old article says every non-EU citizen must have one forever.

Check your current obligation with the Tax Authority.

Legal representative and fiscal representative are not always the same #

A person who helps obtain your NIF is not automatically your permanent fiscal representative.

These can be different roles:

A representative may submit the original application.
A fiscal representative may receive tax communications and perform continuing duties.

Ask clearly:

What role the person accepts
How long the appointment lasts
What fee is charged
How the representation can be cancelled
Whether they will receive official notifications

7. How to update your NIF address #

After moving to Portugal, you may need to update your address through:

Portal das Finanças
e-Balcão
A Finanças office
Another authorised service

You may need:

Passport
NIF
Portuguese residence permit
EU registration certificate
AIMA application evidence where accepted
Rental contract
Property deed
Other proof of address

The documents accepted for changing from non-resident to resident status can depend on your immigration position.

Keep proof of the date when you requested the change.

8. What is a NISS? #

NISS means:

Número de Identificação da Segurança Social

It identifies you in Portugal’s Social Security system.

The system is managed by:

Segurança Social

The NISS is used to connect you to:

Employment records
Social Security contributions
Self-employment
Parental benefits
Sickness benefits
Unemployment benefits
Disability benefits
Pension records
Other social support

The NISS is different from the NIF.

NIF versus NISS #

NIF	NISS
Issued by the Tax Authority	Issued by Social Security
Used for tax and financial matters	Used for Social Security
Often needed before work starts	Needed to register employment and contributions
Can be obtained by non-residents	Normally connected to activity or residence in Portugal
Does not create Social Security rights	Connects the person to Social Security records

You normally keep both numbers permanently.

9. Who can request a NISS? #

Foreign citizens can request a NISS.

It may be needed by:

Employees
Self-employed workers
Company directors
Domestic workers
People entering a Social Security scheme
People applying for certain benefits
People with another recognised reason

The request can be made by:

The individual
An employer
A legal representative

The NISS application is free.

The official service is available through the page for requesting a Social Security Identification Number.

10. How to request a NISS online #

Foreign citizens can request the NISS online through the Social Security portal.

The general process is:

Open the official NISS application service.
Complete the online form.
Enter personal details.
Explain your connection to Portugal.
Upload the requested documents.
Submit the application.
Save the confirmation.
Monitor the application status.
Download the NISS confirmation after approval.

Use the official NISS application service.

Documents for a NISS application #

Common documents can include:

Passport
Residence permit
EU registration certificate
Residence visa
AIMA application evidence
Employment contract
Promise of employment
Company documents
Self-employment documents
NIF
Portuguese address
Representative authorisation

The exact documents depend on the reason for requesting the number.

11. Can an employment contract be signed without a NISS? #

Yes.

A foreign worker does not need to have a NISS printed in the employment contract before the contract is signed.

The contract can be used as supporting evidence for the NISS request.

After Social Security issues the number, the employer must report the employment relationship through the Social Security system.

This means the correct sequence may be:

Sign the employment contract.
Request the NISS.
Receive the NISS.
Employer registers the employment relationship.
Contributions begin through payroll.

An employer should not create a fake or inactive contract only to help someone receive a number.

12. Does getting a NISS register you as employed? #

No.

Receiving a NISS does not automatically mean:

You are registered as an employee
Your employer is paying contributions
You are registered as self-employed
You qualify for benefits
Your employment is legal
Your immigration status allows work

After the number is issued, the employment or professional activity must still be registered correctly.

For employees #

The employer normally needs to communicate:

Start of employment
Employment contract details
Salary
Working time
Other payroll information

Check your Social Security record after starting work.

For self-employed workers #

A freelancer may need to:

Open activity with Finanças.
Obtain a NISS.
Register in the Social Security system.
Submit quarterly declarations.
Pay contributions when required.

Opening activity with Finanças and receiving a NISS are separate steps.

Segurança Social Direta is the online portal for Portuguese Social Security.

It can be used to:

Check contributions
Review employment records
Submit declarations
Request certificates
Update contact details
Review benefit information
Check debts
Manage self-employed obligations
Download proof of a regular contribution situation

Access it through Segurança Social Direta.

Registering for online access #

After receiving a NISS, create access to Segurança Social Direta.

You may need:

NISS
Date of birth
Contact information
Mobile number
Email address
Address recorded in Social Security

Make sure your address and contact details are correct.

Important notices may be sent electronically.

The Portuguese public healthcare system is called:

Serviço Nacional de Saúde, or SNS.

Your public healthcare identification number is called:

Número Nacional de Utente
Número de utente
SNS user number
Health user number

The number identifies your health record in the public system.

What is it used for? #

The SNS user number may be used for:

Registration at a health centre
Hospital care
Public medical appointments
Laboratory tests
Vaccinations
Electronic prescriptions
Referral records
Medical history
SNS 24 services
Public healthcare billing
Family doctor registration

It helps different SNS facilities connect your healthcare information.

No.

The number identifies you in the system, but payment and coverage depend on your legal and healthcare status.

Your record may need to include:

Identity
Portuguese address
Residence status
Healthcare entitlement
NIF
Contact details
Social Security information where relevant

A person can receive an SNS number because medical care is needed without automatically gaining every right available to a fully registered resident.

Do not confuse:

Having an SNS number
Being registered at a health centre
Having full healthcare entitlement
Being assigned a family doctor
Having private insurance

These are separate matters.

A number may be allocated to:

Portuguese citizens
Legal residents
EU citizens
Non-EU residents
Applicants for international protection
Refugees
People who need treatment at an SNS facility
Other eligible users

A foreign person can often receive the number:

At a health centre
At a public hospital
Through the combined identification-number service
During registration with the SNS

The official service is described on the page for obtaining an SNS user number.

A common method is to register at the health centre responsible for your address.

The health centre is called:

Centro de saúde

The general process is:

Find the health centre for your residential area.
Contact the reception desk.
Ask to register as an SNS user.
Present your documents.
Receive or confirm your número de utente.
Complete your local health-centre registration.

Use the official service for registering at a health centre.

Documents commonly requested #

A health centre may request:

Passport or identity card
Residence permit
EU registration certificate
Residence visa
AIMA application evidence where accepted
NIF
NISS
Proof of Portuguese address
Telephone number
Email address
S1 form where applicable
European Health Insurance Card for temporary situations
Other healthcare entitlement evidence

Requirements can differ between health centres.

Bring original documents and copies.

18. Proof of address for healthcare registration #

You should normally contact the health centre responsible for the area where you live.

Possible address documents include:

Rental contract
Property deed
Parish council certificate
Utility bill
Finanças address record
Residence document
Host declaration

Registration at a health centre does not guarantee that a family doctor is available immediately.

19. Family doctor assignment #

A family doctor is called:

Médico de família

After registering at the health centre, you may be:

Assigned a family doctor
Added to a waiting list
Treated through another local care team
Directed to open-access appointments

Availability differs greatly between regions.

Having an SNS number does not guarantee immediate assignment.

SNS 24 provides:

Health guidance
Telephone triage
Online health information
Access to some digital services
Electronic health records
Prescription and appointment information
Contact-detail management

The main telephone number is:

808 24 24 24

In emergencies, call:

112

The SNS 24 portal is available at SNS 24.

After your health record is active, you may be able to use:

SNS 24 portal
SNS 24 mobile application
Chave Móvel Digital
Other accepted identification methods

You can use these services to review:

Prescriptions
Vaccinations
Test results
Appointment information
Medical certificates
Health contacts
Other electronic records

Your email and mobile number should be correct in the National User Register.

You can update contact information through:

SNS 24 portal
SNS 24 mobile application
Health centre
Public health facility

Check:

Mobile number
Email
Address
Emergency contact
Identification information

Incorrect contact details can cause missed appointment messages and difficulties accessing digital records.

Portugal allows eligible foreign citizens with a Portuguese address to request all three identification numbers through one procedure:

NIF
NISS
Número Nacional de Utente

The service is available at selected:

Espaços Cidadão

It is not yet available in every town or Citizen Shop.

Check the official page for requesting NIF, NISS and SNS numbers together.

23. Who can use the combined service? #

The person must normally:

Be a foreign citizen
Have a Portuguese address
Not have a Portuguese Citizen Card
Meet one of the eligible status conditions

Eligible categories include people who:

Applied for or already obtained a residence permit
Are citizens of an EU country
Applied for international protection
Hold refugee status
Are beneficiaries of international protection

The service is not a general pre-arrival option for everyone living abroad.

A person applying from another country without a Portuguese address will normally need to use the separate procedures.

24. Where is the combined service available? #

In June 2026, the combined request was available at 12 participating Espaços Cidadão.

The list may expand or change.

Do not travel to a random Loja do Cidadão assuming the service is available there.

Check the current location list on the official combined-service page before attending.

An appointment may be required.

25. Documents for the combined request #

Common documents can include:

Valid passport
Portuguese address
Residence permit
Proof of residence application
EU identity document
EU residence registration
International protection document
Refugee or protection document
Portuguese telephone number
Email address
Chave Móvel Digital where required
Representative documents where applicable

The exact list depends on the applicant’s status.

Take all immigration and address evidence available.

26. Can a representative use the combined service? #

A representative may be able to submit the request in eligible situations.

The representative may need:

Valid identification
Authorisation
Applicant’s passport
Applicant’s immigration document
Proof of Portuguese address
Contact details

The numbers can later be consulted by the applicant or the representative who submitted the request.

Use a clear written authorisation and keep a copy.

27. How are the numbers delivered? #

After a combined request, the numbers may be:

Sent by email
Made available through the government digital portal
Delivered through another official electronic channel

Processing may not be immediate.

Keep the request receipt and verify that all three numbers belong to the correct person.

Check:

Full name
Date of birth
Passport number
Address
Number itself

Report errors as soon as possible.

28. Do the three numbers expire? #

No.

The identification numbers themselves do not normally expire.

However:

Residence documents expire.
Passport details change.
Addresses change.
Tax status changes.
Social Security registration changes.
Healthcare entitlement can change.

Update the underlying records when your circumstances change.

29. Which number should you get first? #

The best order depends on your situation.

Before moving to Portugal #

You may need the NIF first for:

Visa preparation
Portuguese bank account
Rental contract
Property purchase
Business creation

NISS and SNS registration are normally more connected to employment, residence and life in Portugal.

After arriving with a residence visa #

A practical order is often:

Confirm your Portuguese address.
Obtain or update the NIF.
Request the NISS if working.
Complete the AIMA residence process.
Obtain the SNS user number.
Register at the local health centre.
Activate online access to public services.

The exact order can change depending on your visa and employer.

Starting employment #

The sequence may be:

Obtain NIF.
Sign the employment contract.
Request NISS.
Employer registers the employment relationship.
Complete tax and payroll setup.
Obtain SNS number and health-centre registration.

Starting self-employment #

The sequence may be:

Obtain NIF.
Open activity with Finanças.
Obtain or confirm NISS.
Register Social Security activity.
Set up invoicing.
Review VAT and income-tax duties.
Obtain SNS number and register for healthcare.

EU citizen moving to Portugal #

A typical order may be:

Obtain NIF.
Arrange accommodation.
Start work or prove sufficient resources.
Register residence with the municipality after the required period.
Obtain NISS for work.
Obtain SNS number.
Register at a health centre.

The combined service may simplify several of these steps.

30. Can you work with only a NIF? #

No.

The NIF is not proof of:

Work authorisation
Social Security registration
Employment registration
Residence permission

To work legally, you may also need:

Correct immigration status
Employment contract
NISS
Employer registration
Tax registration
Professional licence

31. Can you receive healthcare without a NISS? #

Yes, in many situations.

The NISS belongs to Social Security, while the número de utente belongs to healthcare.

A person may receive:

Necessary medical care
Emergency treatment
An SNS user number
Health-centre registration

without being employed or having a Portuguese Social Security contribution record.

However, the person’s payment and entitlement status must still be correctly recorded.

Sometimes.

A health facility may allocate a user number when a person needs medical care.

Other documents may also support registration, including:

EU status
Residence visa
Pending residence application
International protection status
Refugee status
Another legal basis

Having a number does not automatically mean full resident coverage.

Ask the health facility to confirm how your entitlement is recorded.

33. Can children receive all three numbers? #

Yes.

Children may need:

NIF
NISS in some circumstances
SNS user number

Parents or legal guardians usually submit applications for minors.

Possible documents include:

Child’s passport
Birth certificate
Parent’s identification
Custody documents
Portuguese address
Residence documents
Representative authorisation

A child may receive an SNS number during registration at a health centre or public healthcare facility.

34. Common problems with NIF applications #

Address document not accepted #

Use a recent and official document showing your full name and address.

Wrong tax status #

Check whether you were registered as resident or non-resident.

Unknown permanent representative #

Confirm who is recorded as your fiscal representative.

Duplicate request #

Do not apply for a second NIF if one has already been assigned.

Name mismatch #

Your name should match your passport.

Address not updated after moving #

Change it when required and keep proof.

35. Common problems with NISS applications #

Uploading only a passport #

Social Security may also need evidence explaining why you need the number.

Employment contract missing information #

The contract should identify both employer and worker.

Employer waiting for NISS before signing #

A contract can normally be signed first and used for the application.

Receiving a NISS but not registering employment #

The employer must still report the employment relationship.

Incorrect email address #

This can prevent you from receiving the result.

Duplicate applications #

Repeated applications can create delays or conflicting records.

Believing the number guarantees a family doctor #

Doctor assignment depends on local capacity.

Registering at the wrong health centre #

Use the facility responsible for your residential area where possible.

Missing proof of address #

Bring a rental contract or another accepted document.

Incomplete healthcare entitlement #

Ask staff to confirm that residence and entitlement information is correctly recorded.

Incorrect contact information #

Update your mobile number and email.

Private insurance does not automatically register you in the public system.

37. Avoid paid services that promise impossible results #

Many companies sell help with Portuguese identification numbers.

Some are legitimate, but others are not clear about what they provide.

Be careful when a service:

Promises all numbers before you qualify
Claims a NIF gives residence rights
Guarantees full SNS healthcare
Creates a fake employment contract for a NISS
Refuses to identify the legal representative
Keeps permanent access to your tax account
Charges continuing representation fees without explanation
Uses your Digital Mobile Key without clear permission
Requests passwords by message
Refuses to provide an invoice

Never share:

Portal das Finanças password
Segurança Social Direta password
Chave Móvel Digital PIN
One-time authentication codes

A representative should use legal authorisation, not your personal password.

38. How to store your identification records #

Create a secure folder containing:

NIF document
NISS confirmation
SNS user number
Passport
Residence visa
Residence card
EU registration certificate
AIMA application evidence
Portuguese address proof
Employment contract
Self-employment registration
Health-centre registration
Representative authorisations
Application receipts

Suggested file names:

2026-08-02_NIF_Confirmation.pdf
2026-08-08_NISS_Confirmation.pdf
2026-08-15_SNS_User_Number.pdf

Do not publish photographs of these documents online.

39. First-week checklist #

Check whether you already have a NIF.
Confirm the address registered with Finanças.
Request a NISS if you will work.
Confirm that your employer registered the employment relationship.
Obtain an SNS user number.
Register at your local health centre.
Confirm your phone number and email in all three systems.
Create access to Portal das Finanças.
Create access to Segurança Social Direta.
Activate SNS 24 access.
Save every application receipt.
Check whether the combined service is available near you.

40. Document checklist #

NIF #

Passport or EU identity card
Proof of address
Residence document where available
Representative authorisation where applicable
Child’s birth certificate where applicable

NISS #

Passport
NIF
Residence or immigration document
Portuguese address
Employment contract or professional evidence
Representative authorisation where applicable

Passport
Residence or immigration document
NIF
NISS where available
Proof of Portuguese address
S1 or other entitlement evidence where applicable
Contact details

Combined service #

Passport
Portuguese address
Eligible residence, EU or protection document
Email
Mobile number
Chave Móvel Digital where required
Representative documents where applicable

Final advice #

The simplest way to understand Portugal’s identification system is:

NIF: taxes and financial life
NISS: Social Security and work records
SNS number: public healthcare identification

Most newcomers need the NIF first.

The NISS becomes important when you start employment or self-employment.

The SNS user number is needed to connect you to the public healthcare system and register at a local health centre.

Eligible foreign residents with a Portuguese address may be able to request all three numbers through one combined procedure at a participating Espaço Cidadão.

Remember that none of these numbers replaces:

A visa
A residence permit
Work authorisation
Tax registration
Employment registration
Healthcare entitlement

Getting the number is only the first step. You must also make sure that your address, residence status, employment and entitlement are correctly registered in each system.