Onboarding documentation varies from state to state, but here is the list of required and highly recommended onboarding forms.
Federally required- I-9
 - W-4
 - Families First Coronavirus Relief Act Poster (Must be given to employees who work remotely. Otherwise, can be posted at worksite.)
 - Department of Labor notice regarding Health Insurance Marketplace
 
State and locally required
- State/local withholding tax form (not required/available in some states)
 - Worker's compensation policy information (not required in some states)
 - Employer unemployment account information
 - Paid family leave insurance policy information (not required in some states)
 - Certain employee rights notices
 - Sexual harassment training certificate (not required in some states)
 
Recommended
- Pay rate notice (format varies by state)
 - Employee handbook
 - Tip policy/tip credit acknowledgment
 - Alcohol awareness policy
 - Direct deposit enrollment form
 - Emergency contact info form
 - Benefits enrollment instructions
 - Food handler's certification
 
Consider for certain positions
- Offer letter
 - Confidentiality agreement
 - Non-solicitation agreement
 - Arbitration agreement