Obtaining a Social Security Affiliation Number in Bilbao (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 Affiliation Number (NAF) in Bilbao. Free procedure, available online or in person at the General Treasury.
Required documents
-
DNI, NIE or passport
Original valid identification document.
0 €
Free procedure €0.00
€0.00
€0.00
: 2026
Step by step
- 1
Online process (recommended)
Go to official siteLog in to the Social Security Electronic Office with Cl@ve or digital certificate.
!Expert tip
"If you already have Cl@ve, the process is immediate without leaving home."
- 2
In person with prior appointment
Go to official siteRequest an appointment at the General Treasury of Social Security in Bilbao.
!Expert tip
"Always bring your DNI or NIE original."
Offices and service points - Bilbao
General Treasury of Social Security — Bilbao
Monday to Friday: 09:00 - 14:00
Frequently asked questions
Is the NAF the same as the NIF?
No. The NAF (Affiliation Number) is specific to Social Security and used for contributions. The NIF is your tax identification number (DNI or NIE). They are different documents.
When do I need the NAF?
When you start working, if you register as self-employed, or when you need access to Social Security benefits.
Official sources and useful links
This guide is for informational purposes only. Always check the official source for current information.