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Affiliation must be processed at the regionally competent department of the General Treasury of the Social Security according to the company address, the establishment of the self-employed worker or, in the absence of this, their home address.

If the workers are included in the Social Security Special Scheme for Sea Workers, affiliation should be processed at the Provincial Directorate or Local Office of the corresponding Social Marine Institute.

Nevertheless, they can also submit the affiliation application in any of the offices of the General Treasury of the Social Security or in the registration offices provided for in Art. 38.4 of Law 30/1992 (post offices, bodies of the General State Administration and the Autonomous Communities, Spanish diplomatic or consular offices abroad, etc.)

As a general rule, the affiliation application must always be submitted prior to starting to provide services as an employed worker, under the same terms as for initially acquiring active contributor status.

However, as an exception, affiliation takes place after starting work in the case of the Special Scheme for Self-Employed Workers, as is stated in transitional provisions.

If the details provided when becoming affiliated are subsequently amended, the employer or the worker, as applicable, must send notification of these changes within a six-day period.