These statutes show that a sworn declaration is just as effective as a notarized Affidavit. An affidavit is a written statement.A person, known as the affiant, swears under oath to the statement's truthfulness. Administering an oath or affirmation is an important role of a Notary. Understand when and how to perform both types of declarations using the NNA's guide. The document MUST be complete (fields filled in) before the sworn statement is given and then signed in the presence of the notary. Affidavits: Require notarization and a formal oath. A notary public must use a certificate in substantially the following form in notarizing an attested copy. This is a comprehensive list of forms, applications, checklists and guidelines for permitting, plan review, inspections and more. I {witness full legal name}.