The I864 Affidavit of Support is a signed document that a sponsor signs in order to accept full financial responsibility for the sponsored immigrant. Use this form to show they have adequate means of financial support and are not likely to rely on the US government for financial support.There are several types of Affidavit of Support forms (I-864, I-864EZ, I-864W, and I-864A). Form I-134 Affidavit of Support is an important supporting document for your non-US immigrant visa request. Clearly and legibly print your name at the top of the Affidavit form exactly as it appears on the identification document you have selected. 4. Call 6024167200 for more information. Our office at 802 S. 1st Ave. The documents include an affidavit of support form and financial evidence. First, you'll need to file your petition. Along with that petition, you'll need to file another form, the Affidavit of Support (Form I-864).