How Can I Prove U.S. Domicile? You or your spouse has a Utah driver's license.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). On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary. Use our Affidavit of Residency form to verify your home address for official purposes. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. Your domicile is the location of your permanent home. The resources listed here describe the various ways in which you may be eligible for in-state (resident) tuition under the provisions of Utah state law.