Completing and signing Form I-864 makes you the sponsor. Form I134 is used to document the personal finances of a sponsor who lives in the United States.If you are coming to the United States on a temporary visa, you may need to prove financial support. A sponsor can file the I-134 form. The purpose of the Affidavit is to assist consular officers in determining whether a visa applicant will have adequate means of financial support in the US. A Form I134 affidavit of support serves as a visa applicant's evidence of sponsorship, or evidence that the applicant has financial support. Applicant Information. You may also need to submit Form I-134 Affidavit of Support. By signing this, you agree to financially support a foreign visitor during their stay in the United States. Is I-134 the same form that you fill out to sponsor a green card applicant?