Verify statements for legal matters and business transactions using our Illinois general affidavit form template. Use this form to swear under oath in writing to facts that you personally know.Tax Application and Affidavit Forms. Once completed, please submit the applicable form(s) below via email or mail to the address provided on the form. All forms are ADA accessible, and you can handwrite or type into the PDF form to fill it out. Instructionsâ–¾. In 1, enter your name and the date you served the occupants. In 2, check the box that states how you delivered the Demand or Notice. The will on file is attached. Property Identification Number: Document Number to Correct: Attach complete legal description. This includes their full legal name, address, and contact information.