The Bureau of Citizenship and Immigration Services advises that if an employee is rehired within three years of the date he/she initially completed a Form I-9, the employer may re-verify the information instead of completing a new form.

Updating A Previous I-9
To update a previously completed I-9, the employer should record the date of rehire, sign and date Section 3 of the previously completed I-9, or complete a new form.

Re-Verifying A Previous I-9
To re-verify a previously completed I-9, the employer should record the date of rehire, record the document title, number, and expiration date (if any) of documentation presented to re-verify expired work authorization or work authorization documentation, sign and date Section 3 of the previously completed I-9, or complete a new form.

See The Payroll Source, starting on p. 1-20, for more information about Form I-9 requirements.

The above information was taken from the Payroll Currently, Issue #10 dated May 14, 2004.