Employers who are employing people for the first time who are included in the scope of the Social Security System must request their inscription in Social Security from the Social Security Treasury General, through its Provincial Directorates or corresponding Administration offices. If you have a digital certificate you can submit your application though the e-Office Electronic Register of Applications or process it directly through the services available for "Companies and Professionals". The employer must notify registrations, deregistrations and modifications of any person who is going to start or stop working for them within the established deadline.

The employer must also keep their employees registered with Social Security for as long as they are employed by the company, and pay the corresponding contributions within the established deadlines.