The account holder MUST provide an Affidavit of Forgery before any criminal charges can be filed! An affidavit must accompany each forged or counterfeited item.Fill out the form and sign it before a notary then file it in the County Clerk's Office OR fill out the form and sign it at the County Clerk's office. A Forgery Affidavit form is primarily used when the payee's signature has been forged in the process of receiving payment through a Dallas County check. 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? Affidavits must also: • include all relevant facts. • be written in the first person using an active voice. You will need your Assessor's Identification Number (AIN), which is printed on your Secured Property Tax Bill, to complete the transaction. An affidavit of forgery is an official declaration that a fraudulent act was committed.