"Do You Swear (Or Affirm) That The Statements In This Document Are True? " Verification upon oath may be taken in an individual capacity or in a representative.Electronically - Go to our website at MyTax.illinois. The Illinois Department of Revenue (IDOR) sends letters and notices to request additional information and support for information you report on your tax return. 1. Enter the current date. (Recommend 10 calendar days from the date the letter was sent.) Household did not respond to first request. Include the full name of the employer or authorized signatory, along with their title (if applicable). Next, specify the department and job description clearly. Next, specify the department and job description clearly. Start with your explanation.