What is the primary purpose of the federal Form I-9 that every U.S. employer must complete for each new hire?

解析

Form I-9 exists to document that the employer examined acceptable documents and verified the new employee's identity and authorization to work in the United States, as 8 U.S.C. §1324a(b) requires of every U.S. employer. (a) is the job of the DE 34 new-hire report, which does feed child-support enforcement - a genuinely adjacent form completed at the same moment in onboarding. (b) is the federal W-4 and California DE 4. (d) happens through the employer's EDD payroll tax registration, not through any form the employee signs. All four documents cross the new hire's desk in the same week, which is why they are easy to confuse.