Federal Law Various federal laws require employers to collect information and complete certain forms when hiring new employees, including: Form I-9. Within 3 business days of the date employment begins, employers must complete Form I-9, Employment Eligibility Verification, using original documents presented by the employee that show his or her identity and authorization to work in the U.S. Form W-4. To know how much income tax to withhold from employees' wages, employers should have a Form W-4, Employee's Withholding Allowance Certificate, on file for each employee. Notice of Coverage Options (Exchange Notice). Employers are required to provide each new employee a written notice with information about a Health Insurance Exchange at the time of hiring, within 14 days of the employee's start date. Model language is available from the U.S. Department of Labor. Many states require additional tax forms and other records to be completed when a new employee begins work. Employers may also be required to provide certain state-specific notices to newly hired employees.