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Getting a Social Security Number Affiliation in Castelló de la Plana (2026)

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Cost

Free

Free procedure

Time at office

30 minutes at the appointment

Estimated time

Immediate online

Quick summary

How to obtain the Social Security Number Affiliation (NAF) in Castelló de la Plana. Free procedure, online or in person at the General Treasury.

Required documents

  • DNI, NIE or passport

    Valid original identity document.

0 €
Free procedure €0.00
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€0.00

: 2026

Step by step

  • 1

    Online application (recommended)

    Go to official site

    Access with Cl@ve or digital certificate to the Social Security Electronic Office.

    !

    Expert tip

    "If you already have a Cl@ve, the process is immediate and can be done from home."

  • 2

    In person with appointment

    Go to official site

    Request an appointment at the General Treasury of Castelló de la Plana.

    !

    Expert tip

    "Always bring your DNI or NIE original document."

Offices and service points - Castellon

General Treasury of Social Security — Castelló de la Plana

Monday to Friday: 09:00 - 14:00

Frequently asked questions

Is NAF the same as NIF?
No. The NAF (Number of Affiliation) is exclusive to Social Security and serves for contributions. The NIF is the fiscal identifier (your DNI or NIE). They are different documents.
When do I need NAF?
When you start working, if you register as self-employed, or when you need to access Social Security benefits.

Official sources and useful links

This guide is for informational purposes only. Always check the official source for current information.