As an H-1B holder, a foreign worker is restricted to working only for the employer who acted as his/her H-1B sponsor. If the worker wishes to change jobs, he or she must get another H-1B visa. Employers who sponsor H-1B workers must file an attestation (or promise) with the US Department of Labor before they can sponsor a H-1B worker. H-1B status can be held for no more than six years. After the 6th year, the worker must return to his/her home country, unless he/she is eligible to change to another nonimmigrant category or apply for permanent residence (as described below). Accompanying relatives may stay in the US with the H-1B worker, but they cannot work, unless they qualify for a work visa in their own right.