Social Security Registration in Spain (NUSS/NASS)

What is the Spanish Social Security Number (NUSS/NASS)?

If you are moving to Spain for employment, one of the very first steps you must complete is your Social Security registration, which provides you with a Spanish Social Security Number (NUSS/NASS). This unique identifier is required before you can start an employment contract, register for public healthcare or contribute to the Spanish social-security system.

The Número de Afiliación a la Seguridad Social is your permanent identification number within the Spanish Social Security system. You will use it throughout your working life in Spain and later for benefits and pensions.

Why your Social Security Number is essential

You need a Social Security Number in Spain to:

• Sign any employment contract as an employee.
• Be registered (alta) by your employer.
• Access public healthcare.
• Pay social-security contributions.
• Receive sickness leave, maternity/paternity benefits and other employment-related benefits.
• Accumulate unemployment rights and future pension rights.
• Register and log in to Social Security online services.

Without this number, you legally cannot work as an employee in Spain, and your employer cannot complete your registration with Social Security.

Who needs to apply for a Social Security Number?

You must obtain a Social Security Number (NUSS/NASS) if:

• You are starting a job in Spain.
• You have never worked in Spain before.
• You are relocating to Spain with an employment contract.
• You are undergoing an immigration process as a non-EU employee.
• You are an EU citizen taking up work in Spain.
• You need access to public healthcare as a worker or future worker.

Foreign nationals — both EU and non-EU — can apply as long as they hold the correct immigration status or are in the process of being hired. We coordinate the timing with your immigration and employment procedures.

Documents required for Social Security registration

Documentation requirements can vary slightly between provinces, but typically include:

• Passport or national identity card (for EU citizens).
• NIE or foreigner identification number (if already available).
• Employment contract, job offer or employer details (if applicable).
• Completed application form for Social Security registration.
• Proof of address, sometimes requested depending on the province.

We review all documents beforehand to prevent delays, rejections or multiple appointments. If something is missing or incomplete, we help you fix it before submitting your application.

How NomadTaxSpain manages your Social Security registration

We provide a complete, end-to-end service to obtain your Social Security Number efficiently and correctly:

1. Eligibility and document verification — we check your immigration situation, confirm that you can legally request the number and ensure your documents meet Social Security standards.
2. Preparing the official application — we complete the required forms and prepare all supporting documentation.
3. Filing the request with Social Security — we submit your application electronically or arrange the necessary appointment, depending on local procedures.
4. Obtaining your Social Security Number — once approved, we obtain the certificate confirming your NUSS/ NASS, usually issued quickly when documentation is correct.
5. Guidance for your employer — we provide your employer with the details they need to complete your alta (employment registration) once your number is issued.
6. Optional: Digital access activation — if you wish, we can also help you set up digital credentials (such as Cl@ve or an FNMT certificate) so you can manage your Social Security matters online.

Our goal is to ensure that your number is issued on time and that both you and your employer can move forward with the hiring process smoothly.

Why timing matters for Social Security registration

Having your Social Security Number ready at the right time avoids:

• Delays in starting your new job in Spain.
• Administrative complications for your employer during the hiring process.
• Gaps in access to public healthcare coverage.
• Problems with payroll, tax withholdings and employment rights.
• Misalignment between immigration status and employment registration for non-EU nationals.

For non-EU employees, Social Security registration is also a key step in coordinating residence and work authorisations with real employment start dates.

Why choose NomadTaxSpain for your NUSS/NASS registration

We specialise in assisting international employees and newcomers who need a fast, reliable and English-speaking point of contact in Spain.

• Specialists in helping expats and relocating professionals start work in Spain.
• Fast and reliable processing aligned with your employment start date.
• Clear guidance in English at every step.
• Coordination with your employer and other administrative procedures (NIE, empadronamiento, digital certificate, etc.).
• Experience with both EU and non-EU employee procedures across Spain.
• Transparent and competitive pricing.

Our aim is to make your onboarding process in Spain as smooth, compliant and stress-free as possible.

Get your Social Security Number and start working in Spain

If you are about to start a job in Spain or you have received an offer, now is the right moment to obtain your Social Security Number (NUSS/NASS). Acting early avoids delays in your start date and ensures immediate access to employment rights and healthcare.

Share your employment details and basic information with us and we will manage the entire registration so you and your employer can focus on your new role.