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That is to say, any procedure that regulates your professional relations in the country and those that depend on and are related to your contributions. We are talking, for example, about signing an employment contract, receiving unemployment benefits, receiving a pension, benefiting from health care in Spain, etc. Once you have obtained these two, you will have to apply for this number, which will help you be identified in the eyes of the Social Security and will be useful for a large number of procedures. Your TIE or residence card will not be enough either.
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Hence, if you are a foreigner and want to work for a company (or register as self-employed), the NIE number will not be enough. The Social Security number is an indispensable number that not only any foreigner, but also any Spanish national, needs if they want to start working in Spain.
