You must use the online application form. This form is bar-coded and will store your information securely for faster processing.Providing proof of domicile in the United States is critical for most people when submitting Form I864, Affidavit of Support. If you spend more than 183 days in a state, that state expects to collect state and local taxes on all income, even if no part of it was earned there. AN. Arunachal Pradesh. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. Everyone who registers on Election Day must provide one of the proofs of residence listed below. Certificate of citizenship (N-560, N-561). 5. 6. American Indian card (Form I-1872) or Minn.