- Form W-4 – Internal Revenue Service – Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Consider completing a newForm W-4 each year and when your personal or financial situation changes.
- Form W-9 – Request for Taxpayer Identification Number and Certification – An individual or entity (Form W-9 requester) who is required to file an information return with the IRS must obtain your correct taxpayer identification number (TIN)which may be your social security number (SSN), individual taxpayer identification number (ITIN), adoption taxpayer identification number (ATIN), or employer identification number (EIN), to report on an information return the amount paid to you, or other amount reportable on an information return.
- Form I-9 – Instructions for Employment Eligibility Verification – Employers must complete Form I-9 to document verification of the identity and employment authorization of each new employee (both citizen and noncitizen) hired after November 6, 1986, to work in the United States. In the Commonwealth of the Northern Mariana Islands (CNMI), employers must complete Form I-9 to document verification of the identity and employment authorization of each new employee (both citizen and noncitizen) hired after November 27, 2011. Employers should have used Form I-9 CNMI between November 28, 2009 and November 27, 2011.