The A1 form is used by cross border workers, to apply for in the country where they pay social security contributions, to present to the social security in the country where they are temporarily placed to work.
In case of workers on a contract, it´s usually the employer that applies for the form, in the case of self employed workers, they do themselves.
Those that are employed or registered as self employed in Spain and are going to work abroad temporarily, need to apply for this form, with their local “Tesorería General de la Seguridad Social”.
More info about the limited validity etc.
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