When you send us this form, please include a copy of the letter that we sent you asking for proof of your. Massachusetts residency status.Date of this verification: 3. An Affidavit of Identity is a legal document that is used to formally confirm or verify a person's identity. 1. Step 1: Print the affidavit form. 2. This guide covers requirements, sample language, costs, and frequently asked questions to ensure your document is compliant and legally sound. Fill out this form if you cannot provide the documentation needed to verify your income. You should always try to provide formal documentation if you can. Fill in the Information: Carefully enter your personal details, verifying accuracy against identification documents like your driver's license or passport.