Immmigrants who are applying to obtain a Green Card through a family member must submit an I-864, Affidavit of Support form. The Affidavit of Support form is used to show the USCIS that a Green Card applicant has a financial sponsor and has enough financial support to live without concern of becoming dependant on U.S. government welfare.
Form I-864 is legally required for many family-based and some employment based immigrants to show that, when they plan to immigrate to the US, they have adequate means of support. Generally, the following immigrants need an Affidavit of Support namely:
Family based immigrant visa applicants, including certain orphans, and
Employment based immigrant visa applicants whose relative filed the visa petition or has at least 5 percent or more ownership interest in the business that filed the petition.
So who qualifies as a sponsor in the I-864, affidavit of support case?
A sponsor must be at least 18 years old and either an American citizen or a lawful permanent resident (LPR). The sponsor should also have a domicile (residence) in the United States. The petitioner who is residing abroad should have a principal residence in the U.S. and intend to maintain that residence in the future. Lawful permanent resident sponsors should show they are maintaining their permanent resident status.
Many U.S. citizens and permanent residents reside outside the United States on a temporary basis, usually for work or due to family situations. This “Temporary” status will cover an extended period of residence abroad. Certain conditions need to be fulfilled by the sponsor living abroad to be considered domiciled in the United States.
An American citizen or permanent resident spouse or his /her dependent who has maintained a residence in the U.S. and/or whose spouse/parent works would also qualify as a sponsor related to the I-864, Affidavit of Support form.

