Step One: Complete the Form. File Supplemental C Affidavit of Certification Form.Supplemental C Affidavit of Certification for the City of Oakland. Information on HOUSEHOLD MEMBER No-Income Affidavit. If a household member is age 18 and over and has no income, a No-Income Affidavit must be included. All household members with no income must complete the No-Income Affidavit. Property Transfer Affidavit.