Employer completes reverification (Supplement B) before expiration, if the employee's work authorization document expires
Employer completes Section 2 physical document review (within 3 days of start date)
Employee completes Section 1 of Form I-9 (Day 1 of work)
I-9 is retained until 3 years after hire or 1 year after termination, whichever is later, then eligible for disposal