For those sponsoring an immigrant to become a citizen, you will likely need to sign a Form I-864, otherwise known as an Affidavit of Support.
According to the U.S. Citizenship and Immigration Services (USCIS), this document is required "for most family-based immigrants and some employment-based immigrants" to show the federal government that they will have a means of support when they arrive. If you are petitioning for a relative or spouse to come to the United States, you will probably be required to sign this affidavit.
But there are three important things sponsors should know about these affidavits of support: