If you want to sponsor someone for a family-based green card, you need to provide proof of a U.S. domicile in your Affidavit of Support (Form I-864). If not submitted to NVC along with the Affidavit of Support form, the petitioner will need to provide the visa applicant with evidence of his or her domicile.Please submit proof of domicile. How Can I Prove U.S. Domicile? Petitioners must submit evidence establishing the domicile requirement to the National Visa Center (NVC) along with the Affidavit of Support. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. Instructions: Complete this form to clarify for the Michigan Department of Treasury your domicile for tax purposes.