TA.1 form: how to fill it in for your social security number

TA.1 form: interactive example

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What is the TA.1 form

The TA.1 form (TA1 form in Spain, also written TA1) is the Spanish social security number application form, sometimes called the NUSS form (número de la Seguridad Social). It covers Social Security affiliation, the assignment of a number and changes to your details. Your employer usually submits it before you start work. You apply yourself if the employer doesn't, if you want the number earlier or if you are self-employed (autónomo).

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Download the TA.1 form

The Tesorería General de la Seguridad Social (TGSS, the Social Security treasury) publishes the TA.1 as a fillable PDF, version 07-2024: you can fill it in on a computer, print it and sign it. Type it or write in CAPITALS, with no corrections or crossings-out. In regions with a co-official language, it is also available in that language.

Download the TA.1 (official PDF)

How to fill in the TA.1, box by box

The form is in Spanish, so write your answers in Spanish too.

1.1 Surnames and name

PRIMER APELLIDO (first surname), SEGUNDO APELLIDO (second surname) and NOMBRE (first name) in full, as on your document.

1.2 SEXO (sex)

H (hombre, man) or M (mujer, woman).

1.3 TIPO DE DOCUMENTO IDENTIFICATIVO (type of ID document)

DNI (Spanish ID card), TARJETA DE EXTRANJERO (foreigner's card) or PASAPORTE (passport); the passport only when registering EU, EEA or Swiss citizens.

1.4 Document number

The number of that document; with a foreigner's card, your NIE.

1.5 Social Security number and birth

Only for a change of details. Below it: date, place and country of birth, parents A and B (PROGENITOR/A) and nationality.

1.6 Degree of disability

Only if officially recognised, as shown on the certificate from IMSERSO or your regional government.

1.7 Maiden name

Only EU nationals, except Spanish women.

1.8 Address

Type of street (calle, plaza) and full name with no abbreviations, number, floor, postcode, municipality and province.

1.9 Contact details

Email and mobile. Entering them means you accept informative messages from Social Security; also tick SI or NO at ACEPTO ENVÍO COMUNICACIONES INFORMATIVAS.

2 Type of application

Tick AFILIACIÓN A LA SEGURIDAD SOCIAL (affiliation), ASIGNACIÓN NÚMERO DE SEGURIDAD SOCIAL (number assignment) or VARIACIÓN DE DATOS (change of details). For a change, the reason goes in 2.1 and you only fill in 1.1, 1.3, 1.4, 1.5 and the new detail.

3 Notification, place, date and signature

Address for notifications: the one in 1.8 or another. You or your legal representative sign, and the employer when applicable. Addressed to: the Dirección Provincial or Administración of the TGSS (provincial office).

Where to submit your social security number application

1. Online, with a digital certificate. Use the Asignación de número de Seguridad Social service on the e-office (sede electrónica), mentioned on the Social Security affiliation page. If the certificate fails, see digital certificate and Cl@ve errors.
2. Online, without a certificate. Through Import@ss, the treasury's online portal: the Spanish social security number guide explains that route.
3. In person. Hand in the signed TA.1 at the Dirección Provincial or Administración of the TGSS in the province where the employer is based, or where your business is if you are self-employed. Bring your ID document (DNI, foreigner's card or passport) and, if applicable, the disability certificate.
4. Keep the receipt. The resguardo (receipt) shows the date your application was registered, which starts the deadline for an answer.

Common problems

I don't know which option to tick in section 2

AFILIACIÓN if you are about to start work and have never been affiliated; ASIGNACIÓN NÚMERO if for now you only need the number; VARIACIÓN DE DATOS if you already have a number and a detail has changed or needs correcting.

I only have a passport

If you are from the EU, the EEA or Switzerland, tick PASAPORTE; according to the TA.1 instructions you must provide your NIE within three months of entering Spain (article 7 of Royal Decree 240/2007), with the EX-18 form. Otherwise you need a foreigner's card (TIE): see how to get your NIE.

My employer says they can't register me without a number

The employer must request affiliation for anyone who starts work without being affiliated, before the first day, and can do so with this TA.1 and their signature. If they don't, you can request it yourself. Then check that your employment contract includes the number.

I haven't had an answer

The TGSS has 45 days from registration; the clock stops if they ask you to fix something, and you then have 10 days to do so or the application is closed. Without an answer in time, the application can be considered approved, according to the receipt itself.

Updated 29 October 2026