What financial documentation am I required to attach to the Maricopa County Affidavit of Financial Information? This affidavit is made voluntarily for the purpose of establishing the fact that my signature is a forgery. 7.Do you know who forged your signatures? An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions. Everything you need to know about notarizing affidavits. Learn what an affidavit is and how to notarize it.