temporary employees - required forms
Newbie here. I know what is required when we hire permanent employees, but we often bring in "day laborers" to help with certain projects. For example, we have product in our warehouse that needs to be reworked. It should take about 3 weeks with 3 workers. They will be earning over $1000 each for the project, and we may use them again in a few months for a similar project. What sort of forms are required (California) for me to have them sign? For taxes is it a w-4 or w-9 or is it their choice? I know they do not classify as "independent contractors" but it doesn't seem right to payroll them on a w-4. If they must use a w-4, can they file exempt? I assume I need an i-9 form as well. Thanks in advance for any answers you can give!