What should I do if I rehire a person who previously completed a Form I-9?

If you rehire your employee within three years of the date that a previous Form I-9 was completed, you may either complete a new Form I-9 for your employee or complete Supplement B (formerly Section 3) of the previously completed Form I-9.

To complete Supplement B for rehires, you must:

• Confirm that the original Form I-9 relates to your employee.
• Review the original Form I-9 to determine if your employee is still authorized to work, including whether employment authorization documentation presented in Section 2 (List A or List C) or a previous reverification has since expired (or have been auto-extended). Use the guidelines to determine if reverification applies. 
• If your employee is still authorized to work and his or her employment authorization documentation is still unexpired, enter the date of the rehire in the space provided in Supplement B. 
• If your employee is no longer authorized to work or the employment authorization documentation has expired and requires reverification, request that the employee present an unexpired List A or List C document. Do not reverify an employee’s List B (identity) document. Enter the document information and the date of rehire in the spaces provided in Supplement B. If the version of the previously completed Form I-9 has expired, you must complete Supplement B on the current version.
• Sign and date Supplement B.

Source: Completing Supplement B, Reverification and Rehires (formerly Section 3)