Form I-9 is the Employment Eligibility Verification form used by the  Department of Homeland Security, U.S. Citizenship and Immigration Service (USCIS) to verify that a person can legally work in the United States.  You must have your new household employee complete and sign section 1 of Form I-9 at the time he or she is hired by you.  You are responsible for reviewing and ensuring that your new household employee fully and properly completes section 1 of the form, and that you examine the documentation (such as a Social Security card) presented by your household employee proving that she can legally work for you.  The form describes what types of documents your household employee can show you to verify his or her eligibility to work in the United States.  You must then complete section 2 of that form.  You must keep your household employee's completed Form I-9 for at least 3 years after the date she begins working for you, or 1 year after your household employee stops working for you, whichever is later.  You keep Form I-9 for your records.  You do not send this form to the INS or Internal Revenue Service.