Financial Affidavit - a sworn statement that contains information regarding your income, expenses, assets, and liabilities. An affidavit is a written statement.A person, known as the affiant, swears under oath to the statement's truthfulness. Financial Affidavit, A sworn statement that contains information regarding income, expenses, assets, and liabilities. A notary public must use a certificate in substantially the following form in notarizing an attested copy. Affidavit Services: Notaries assist in drafting and notarizing sworn statements, which are often required in court cases.