The employee must complete Section 1 on or before the first day of paid work. This can be done with the onboarding process ahead of time, or most commonly in the morning of the first day along with other paperwork.
The employer has up until the third business day after the start of paid work to review the original documents provided by the employee. If the employee is going to be hired for less than three days, the documents must be presented and verified within one business day.
Download The Ultimate Guide to I-9 Compliance as a pdf