Once employed, the employee usually fills out an employee form that he needs to fill out with the information requested. An employee form template would normally look like a form with the name of the company on top, and a title stating New Employee Form.
The employer needs to know the complete address of the employee for a number of reasons. One is for payroll purposes. Setting up an account for a person requires him to provide his address. Another reason is that if something wrong happens, they would know where to locate him or his family. The company also needs an employee's address so that they can be certain of his identity. And another reason would be for mailing of anything necessary purposes.