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Updated: October 2026

If you are going to work in Spain, become self-employed or use public services linked to Social Security, you need a Social Security number, known as the NUSS. This guide is for newcomers who have just arrived or are about to start a job. It explains what the number is, how to check whether you already have one, who should apply for it and how to request it online, step by step.

What the NUSS is – and what it is not

The Número de la Seguridad Social (NUSS) is the number the Spanish Social Security system uses to identify you. It is issued by the Tesorería General de la Seguridad Social (TGSS) and stays with you for life, whatever job or region you move to.

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• NUSS and NAF are the same number. The first time you start work that brings you into the system – as an employee, self-employed or in another scheme – your NUSS becomes your Número de Afiliación (NAF). Payslips and contracts often show it under that name.
• It is not your NIE. The NIE is your foreigner identification and tax number. You normally need the NIE (or at least your passport) to get the NUSS.
• It is not your health card. Your regional health service uses your Social Security details to issue the tarjeta sanitaria, but the card is a separate step – see our guide to healthcare for foreign residents.

You need the NUSS to be registered as an employee or employer, to work as an autónomo, to claim benefits and, later, to receive a pension.

Check first: you may already have one

Do not request a second number. You may already have a NUSS if you have worked in Spain before, did an internship here, or studied in Spain under 28 (students in official courses from 3º ESO upwards are covered by the student insurance, Seguro Escolar). Ways to check:

• Look at an old payslip (nómina) or employment contract.
• Download your informe de vida laboral (employment record) from Import@ss.
• Use the Import@ss service “Acreditación del Número de la Seguridad Social”, which shows the number and lets you download a PDF certificate.

Who applies: you or your employer?

Even if your employer will handle it, many people prefer to request the number themselves as soon as they have their NIE. It saves time on the first day and avoids payroll delays.

How to apply online through Import@ss

Import@ss is the TGSS online portal. The service is called “Solicitar el Número de la Seguridad Social” and anyone without an assigned number can use it at any time. Applying is free.

With electronic identification

If you already have Cl@ve (Permanente or Móvil), a digital certificate or a Spanish electronic DNI, log in with it – this is the fastest route. Once the number is assigned, a resolution is issued that you can print. Our guide to the digital certificate and Cl@ve explains how to get these. Note that SMS login only works if your phone number is already registered with Social Security, so it is rarely an option for first-time applicants.

Without electronic identification

Most newcomers do not have Cl@ve yet, and that is fine. You can apply by uploading your documents and a selfie:

1. Download and fill in form TA.1 from the Social Security website (it is recommended before you start). Tick the option to be assigned a Social Security number.
2. Open the Import@ss service “Solicitar el Número de la Seguridad Social” and choose the option for applicants without Cl@ve or a certificate.
3. Enter your details: name exactly as in your passport or NIE document, NIE, mobile number, email address and your usual address in Spain.
4. Upload your identity document: photos of both sides of your NIE document (or your passport if you do not have an NIE yet).
5. Take a selfie holding the front of your ID document, using a device with a camera.
6. Submit and keep the receipt. Watch your email for the outcome – many people hear back within a few days, but it can take longer at busy times.

Applying for a child

A parent, guardian or legal tutor submits the application with their own ID and selfie, a TA.1 form completed with the child’s details, a photo of the child’s ID document, and the Libro de Familia or another document proving parental authority or guardianship. Emancipated minors apply themselves and add proof of emancipation.

Applying in person

If you cannot apply online, you can ask at a TGSS office (Administración de la Seguridad Social). You will need a cita previa (appointment), which can be booked on the Social Security website or app. Bring the completed TA.1 form, your NIE document or TIE, your passport and copies. Appointments can be scarce in big cities, so the online route is usually quicker.

Tips for foreigners

• No NIE yet? The number can be linked to your passport. Once you get your NIE, update your personal data in Import@ss so your records match your tax and health files. See how to get your NIE.
• Spell your name consistently. Use exactly the same spelling and order of surnames as on your NIE document to avoid mismatches later.
• Keep your address up to date in the “Datos personales” section of Import@ss, so official letters reach you.
• It is free. Be wary of websites that charge to “process” a NUSS – unless you are deliberately paying a gestor for help.
• Next steps: once you work, register with your health centre and check your contract and salary – our work visa and permit guide and job market overview can help.

Useful links

• Import@ss – request your Social Security number (Spanish)
• Import@ss – check an existing Social Security number (Spanish)
• Revista Seguridad Social – how to get the NUSS (Spanish)
• Healthcare in Spain for foreign residents
• Residency in Spain: step by step

FAQ: Social Security number

Disclaimer: This article is general information only and is not legal advice. Social Security procedures can change – always check the official Seguridad Social website before you act, and ask a gestor or lawyer if your case is unusual.

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Updated: October 2026

Sooner or later, almost every Spanish government website will ask you to identify yourself with a certificado digital or Cl@ve. Without one of them, many simple tasks mean booking an appointment and queuing at an office. This guide is for foreign residents with an NIE who want to deal with tax, Social Security, traffic and town hall paperwork online. You will learn what each tool does, which one to get first and how to apply step by step.

What the digital certificate and Cl@ve are

Both are ways to prove who you are online to the Spanish public administration. They do the same basic job – logging you in – but they work quite differently.

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• Digital certificate (certificado digital): an electronic file installed in your browser, issued by the FNMT (Fábrica Nacional de Moneda y Timbre). The version for private individuals is called the certificado de persona física. It lets you log in and also sign documents electronically.
• Cl@ve: the government login system linked to your NIE and your mobile number. Once registered, you can log in with Cl@ve Móvil (you approve a notification on your phone), Cl@ve Permanente (a long-lasting password for frequent users) or Cl@ve PIN (a short-lived code for occasional use).

The big portals – the Agencia Tributaria (tax agency), Social Security’s Import@ss, the DGT (traffic), SEPE (employment) and many regional health services and town halls – generally accept both. Some formal procedures where you sign and submit documents work best with the certificate.

Which one should you get first?

Ideally, get both – they complement each other. If you have to choose, this comparison helps:

A practical rule: if you are self-employed (autónomo), run a company, own property or deal with Hacienda often, the digital certificate is close to essential. If you mainly need your employment record, health appointments or the odd form, Cl@ve is usually enough to start. A handy shortcut: once you have the certificate, you can register in Cl@ve online in minutes.

What you need before you start

• Your NIE plus a document that shows it: your TIE card, your EU registration certificate (the green certificate) or the official NIE grant document. See our guide on how to get your NIE if you do not have one yet.
• Your passport – EU citizens can usually use their national ID card instead.
• A mobile number and an email address. Cl@ve accepts Spanish or foreign mobile numbers, but each NIE can only be linked to one number.
• A computer with a supported browser for the certificate request and download.

How to get the FNMT digital certificate

The standard route for foreigners is the “software certificate” with an in-person identity check. It takes four steps, which must be done in this order:

1. Prepare your computer. Follow the FNMT’s “configuración previa” instructions on its website. Use the same computer and the same browser for the whole process, because the certificate is generated in that browser.
2. Request the certificate online. On the FNMT site, choose the persona física certificate, enter your NIE, first surname and email address. You receive a request code (código de solicitud) by email.
3. Prove your identity in person. Take the request code, your NIE document and your passport to an Oficina de Acreditación de Identidad. The FNMT lists more than 2,400 offices and has an office finder. Some, such as tax agency and Social Security offices, require an appointment. Post offices (Correos) cannot do this certificate. If you are outside Spain, a Spanish consulate can do the identity check.
4. Download and back up. Once your identity is confirmed, download the certificate on the same computer and browser using your request code. Do it soon, then export a backup copy protected with a strong password and store it somewhere safe.

Video identification and other routes

The FNMT also offers identity checks by video from home. At the time of writing, this requires a valid Spanish electronic DNI and costs 2.99 euros plus tax (the certificate itself is still free), so it is not an option for most people with an NIE. If you cannot attend the office yourself, someone can go on your behalf, but your signature must first be legalised by a notary.

Validity and renewal

The persona física certificate is valid for four years. You can renew it online during the 60 days before it expires, as long as it has not been revoked. If your certificate was obtained by video identification or has already been renewed online once, you have to prove your identity again. Put a reminder in your calendar – an expired certificate always seems to happen the week your tax return is due.

How to register in Cl@ve

Registering links your NIE to your mobile number and email. There are four routes, but not all are open to foreign residents:

• In person at a Cl@ve registration office: the most reliable route for NIE holders. Bring your TIE or registration certificate and your passport. Some offices need an appointment – use the office finder on administracion.gob.es.
• Online with a digital certificate: if you already have the FNMT certificate, you can register through the Agencia Tributaria’s electronic office without leaving home.
• Online without a certificate (invitation letter or video call): gives only a basic level of registration, which does not open every service.
• Video identification in the Cl@ve app: at the time of writing, only available to Spanish nationals with a valid DNI.

Choosing your login method

After registering, install the official Cl@ve app and activate it with your NIE and registered mobile number. From then on, Cl@ve Móvil is the easiest option: you type your NIE on the government site and approve the request on your phone. Cl@ve PIN suits people who only log in occasionally, while Cl@ve Permanente is a password you set yourself for frequent use.

What you can do once you have them

• Tax: file your income tax return, see your tax data, pay and download tax certificates. Our guide to the Spanish tax system explains the basics.
• Social Security: request your Social Security number, download your vida laboral (employment record) and update your details in Import@ss.
• Traffic: check your licence points, vehicles and fines on the DGT site.
• Town hall: many town halls let you download a padrón certificate online – see our padrón guide.
• Official notifications: read letters sent to you electronically by public bodies instead of waiting for the post.

Common problems and practical tips

• “My certificate has disappeared”: you probably changed browser or computer. Import your backup file into the new browser.
• New phone number: update it in Cl@ve straight away, or you will not receive codes or notifications.
• NIE format: type your NIE exactly as it appears, including the letters at the start and end.
• Working with a gestor: rather than handing over your certificate file and password, ask your gestor to act as your authorised representative with their own credentials.
• Avoid scams: official sites end in .gob.es or .es, and no public body will ask for your Cl@ve password or certificate by phone or email.

Useful links

• FNMT – proving your identity for the persona física certificate
• FNMT – renewing your certificate (Spanish)
• administracion.gob.es – registering in Cl@ve
• How to get your Spanish NIE number
• Residency in Spain: how to become a legal resident
• How to register on the padrón

FAQ: digital certificate and Cl@ve

Disclaimer: This article is general information only and is not legal advice. Procedures, requirements and fees can change – always check the official FNMT and Cl@ve websites before you act, and ask a gestor or lawyer if your situation is complicated.

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Updated: October 2026

Registering on the padrón – known in Spanish as empadronamiento – is one of the first things you should do after finding a home in Spain. It is free, it usually takes one short appointment, and it unlocks healthcare, school places, residency paperwork and much more. This guide explains what the padrón is, which documents you need, the difference between a volante and a certificado, and how to book in Málaga as a practical example.

What the padrón is

The padrón municipal de habitantes is the list of people who live in each town or city. It is kept by the local town hall (ayuntamiento), not by the police or the immigration office. Spanish law is clear: everyone who lives in Spain must register in the municipality where they usually live, and if you split your time between two places, you register where you spend most of the year. This rule comes from the local government law, as amended by Ley 4/1996.

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Two points often confuse newcomers. First, the padrón applies to foreigners as well as Spaniards, whatever their nationality. Second, being on the padrón is not proof of legal residence. It only shows where you live. Your residence status is handled separately – see our guide to becoming a legal resident in Spain.

Why you need to be on the padrón

Your padrón registration is the document that proves your address to other parts of the Spanish administration. In everyday life you will be asked for it in many situations:

• Healthcare: to register with your local health centre and get a health card. See our guide to healthcare for foreign residents.
• Schools and nurseries: places in public schools are allocated partly by address, so the padrón decides which catchment area you belong to.
• Residency: EU citizens applying for the green registration certificate and non-EU nationals renewing a TIE are often asked for a recent padrón document.
• Car and driving: registering a car in your name, exchanging a licence or paying local road tax all start from your registered address.
• Tax and local benefits: regional tax allowances, local discounts, social services and some grants depend on how long you have been registered.
• Voting: EU citizens and some other nationals can vote in Spanish municipal elections, but only if they are on the padrón first.

There is also a wider benefit: town halls receive funding from central government based on how many people are registered. Registering helps your town get the services its real population needs.

Documents you need

Each town hall sets its own detailed list, but the core documents are the same across Spain. Bring originals and copies, and make sure every ID document is still valid.

Identity

• EU, EEA and Swiss citizens: your passport or national ID card, plus your EU registration certificate showing your NIE if you already have it.
• Non-EU nationals: your TIE (foreigner’s identity card) or, if you do not have one yet, your passport.
• Children: passport or ID plus a birth certificate or family book, and in some cases the other parent’s authorisation.

You do not always need an NIE to register on the padrón – a passport is normally accepted – but having one makes later paperwork easier. Read how to get your NIE number if you have not applied yet.

Proof of address

• If you own the home: the title deed (escritura), a land registry note or a recent IBI property tax receipt.
• If you rent: a current residential rental contract. Many town halls also ask for the latest rent receipt, a recent utility bill and a copy of the landlord’s ID.
• If you live with someone else: a signed authorisation from the owner or main tenant, a copy of their ID and their own proof of the right to use the home.

Finally, you fill in and sign the registration form, the hoja padronal or hoja de inscripción. Most town halls let you download it in advance or give it to you at the desk.

Renting without a long contract

Landlords cannot legally stop a tenant who really lives in the property from registering, although some try. If you rent a room or have a short let, ask the landlord for a signed authorisation. If that fails, many town halls can register you after an inspection visit confirms you live there. Our guide to renting in Spain as a foreigner explains your rights as a tenant.

How to register step by step

1. Check your town hall’s website for the current document list and whether you need an appointment (cita previa).
2. Book the appointment online or by phone. In larger cities, slots can be a week or more away, so book as soon as you have your contract or deeds.
3. Fill in the registration form and gather originals and copies of your documents.
4. Attend in person. Each adult usually signs for themselves; parents sign for minors.
5. Ask for a volante or certificado on the spot if you need one for another procedure.

Some towns also allow online registration through their electronic office if you have a Spanish digital certificate or Cl@ve. Smaller villages often register you over the counter without an appointment.

Example: booking in Málaga

In Málaga city, the padrón is managed by the municipal tax and services body GESTRISAM together with the district citizen service offices (OMAC). According to the city’s padrón information sheet, you can register at any district OMAC or at the main office in the Tabacalera building on Avenida Sor Teresa Prat 17.

Appointments are booked through the city’s appointment portal at citaprevia.malaga.eu or by phone on 010 from within Málaga. The city’s appointment rules say appointments are personal and cannot be passed to someone else, you should arrive about ten minutes early and check in at the ticket machine with your ID, and your slot is cancelled if you are more than 15 minutes late. Cancel at least 24 hours ahead if you cannot go.

Volante or certificado: which do you need?

Once you are registered, you can ask the town hall for a document showing it. There are two types:

Both are usually free and many town halls let you download them online with a digital certificate. Most offices that ask for one will only accept a document issued recently – often within the last three months – so request a fresh one before each appointment. If you are unsure which type to bring, ask for a certificado; it is accepted wherever a volante is.

Keeping your registration up to date

• Moving within the same town: request a change of address (cambio de domicilio) with the same proof of address documents.
• Moving to another town: simply register in the new town. The new town hall notifies the old one, which removes you automatically.
• Non-EU nationals without permanent residence: you must confirm your registration every two years. Málaga’s renewal guidance warns that if you miss it, your registration is cancelled and you lose your registration history, which can affect benefits and future applications.
• Leaving Spain: ask the town hall to remove you (baja por traslado al extranjero) or register with your consulate abroad. Otherwise, you may still appear as a resident, which can cause tax and paperwork questions later.

Your length of registration matters. Applications such as Spanish nationality, regularisation routes and some regional benefits look at how many years you have been on the padrón, so keep it continuous and keep copies of old certificates.

Useful links

• BOE – Ley 4/1996 on the municipal register
• Málaga city – padrón general information (PDF)
• Málaga city – appointment rules (PDF)
• Málaga city – renewal for non-EU nationals (PDF)
• Residency in Spain: how to become a legal resident
• How to get your Spanish NIE number
• Healthcare in Spain for foreign residents

FAQ: the padrón

Disclaimer: This article is general information only and is not legal advice. Requirements differ between town halls and can change – always check with your local ayuntamiento before your appointment.