How to File an Affidavit of Support. Find an IRCC application package or form.Sponsor your spouse, common-law partner, conjugal partner or dependent child – Complete Guide (IMM 5289). Get help to open an application form or to fill one out in the Help Centre. 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). Complete this form (INZ 1178) if you are supporting an applicant for New Zealand residence under the Partnership Category. Partnerships with no New York source income that have resident partners must complete and file Form IT-204, with the exception of Section 10. This form is for supporting an applicant for New Zealand residence under the Partnership Category of New Zealand. Government Residence instructions. New Zealand citizens or residence class visa holders must complete sections A to C of the form.