Which document is most likely to be found in an employee's personnel file?

The I-9 Form is most likely to be found in an employee's personnel file because it serves a critical role in verifying an employee's eligibility to work in the United States. This form is mandated by federal law and must be completed by all employees, providing essential information about their identity and employment authorization.

The I-9 requires documentation to prove both identity and work eligibility, which the employee must present at the time of hiring. This is why it is a standard document retained in personnel files for compliance with the Immigration Reform and Control Act.

In contrast, although documents like a Social Security Card, Birth Certificate, and Health Insurance Documents may be relevant for various employment purposes, they do not hold the same regulatory requirement for inclusion in personnel files as the I-9 Form does. The I-9's legal importance ensures that it is consistently maintained in personnel records, reflecting the employer's commitment to compliance and proper hiring practices.