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Social Security number (NUSS / NAF)

Reviewed on October 28, 2026

Summary

The Número de la Seguridad Social (NUSS, Social Security number) identifies you in the Spanish Social Security system. When you start working, that same number becomes your affiliation number (NAF, número de afiliación). You need it for a company to register you, to work as self-employed (autónomo) and for many benefit procedures. It is free and it is given by the Tesorería General de la Seguridad Social (TGSS, the Social Security General Treasury): online in Import@ss (the TGSS online portal) or at a TGSS office. With a digital certificate or Cl@ve it is faster; without a digital ID, the TGSS first checks your identity and it takes longer.

Who is this for?

For people who are going to work in Spain (as an employee or self-employed) and do not have a number yet. If you have worked in Spain before, you already have a number: it is the same for your whole life and you must not ask for another one.

Key facts

Cost
Free
Who gives it
Tesorería General de la Seguridad Social (TGSS)
Where
Import@ss (portal.seg-social.gob.es) or a TGSS office (Administración)
Form
Modelo TA.1 (application for a Social Security number and change of details)
Document
NIE/TIE or passport (with conditions), depending on your case
Can the company apply for it?
Yes. If they are going to hire you and you have no number, the company must apply for it
Registration at work
Always before the first day of work, and at most 60 days before

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Official sources

Nuevo en España offers public information from official sources, quoted and dated. It is not legal advice, it does not book appointments (cita previa) and it does not carry out procedures on anyone's behalf. Rules change: always check the linked official source. For your specific case, consult a lawyer or a free support organisation for migrants.

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