Use our I130 affidavit sample and tips to create a strong affidavit for your spouse. Include these key points and avoid common mistakes.However, you must be at least 18 years of age and have a residence (domicile) in the U.S. before you can sign the Affidavit of Support (Form I-864 or I-864EZ). Much confusion surrounds the need to submit I751 affidavits and how to write them. We explain and provide an I-751 affidavit sample. The K-3 nonimmigrant visa is for the foreign-citizen spouse of a United States (US) citizen. This visa category is intended to shorten the physical separation. 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. Please arrange your documents according to this checklist. The file must be lodged in 2 complete sets of photocopies.