W-4 From - Employee’s Withholding Certificate - https://www.irs.gov/pub/irs-pdf/fw4.pdf
I-9 Form - Employment Eligibility Verification - https://www.uscis.gov/sites/default/files/document/forms/i-9.pdf
DE4 Form - Employee’s Withholding Allowance Certificate - https://edd.ca.gov/siteassets/files/pdf_pub_ctr/de4.pdf