Guided preparationRegional rules
Social Security number (NUSS)
Check whether a number already exists, then prepare a first application or retrieval through Importass.
Responsible authority
Tesorería General de la Seguridad Social · Importass
Rule level
España · comunidad / ciudad autónoma
Application route
online, in person, appointment may be required
Last reviewed
September 20, 2026
What is this for?
NUSS/NAF identifies you with Social Security. Having the number alone does not confirm employment registration or healthcare entitlement.
When can it be useful?
- Check whether a number already exists, then prepare a first application or retrieval through Importass.
Where do I arrange it?
- TGSS · Importass: Solicitar el número de la Seguridad Social
What may I need first?
- Could you already have a NUSS / NAF?
- Who is applying?
- Do you have usable Cl@ve or a digital certificate?
Documents to prepare
- Applicant's accepted identity document, usual address, mobile number and email.
- Any existing Social Security evidence: previous employment record, number report or school insurance record.
- For a first application, the details and form requested by Importass for the selected representation route.
Practical route
- Check whether a NUSS exists from earlier work or school insurance before requesting another.
- Open Importass from the official source; choose consultation/accreditation for an existing number, or first application if none exists.
- Select an identity method you can actually use. No NUSS yet means SMS identification is not available for the first-number route.
- Review name, identity document and address; use the child's details when representing a child.
- Submit only on Importass, retain the receipt and follow any request for additional evidence.
- Download the assigned/existing number report and check personal details. Give it to the employer when relevant; affiliation/work registration is a separate action.
What comes next?
- Keep the number report; do not request a new number for a job change.
- Correct errors through TGSS before reusing the number in another procedure.
Important to check
Preparation aid, not an official form or decision. The competent authority confirms eligibility, required evidence, fees and the outcome. Items marked for confirmation remain unresolved.
Official sources
SpainForm records the authority and review date so this content can be checked and updated manually.