How do I fill out and turn in a General Affidavit? A properly completed, notarized general affidavit form can be useful in legal proceedings.Here's how to make sure your affidavit is valid in Texas. For notaries commissioned or recommissioned on and after January 1, 2016, the seal must also contain the notary public's Secretary of State ID number. Verify statements for legal matters and business transactions using our Texas general affidavit form template. My name is___________________________________________. I am of sound mind, 18 years of age or older, and competent to give this affidavit. Furthermore, Texas law mandates that the general affidavit must be signed in the presence of a notary public or other authorized official. General Affidavits must be signed in front of a notary public. A notary must verify your identification before you sign the document.