You can print a copy of your Certificate of Registration or License using
MyTax Illinois. From your MyTax Account, the Certificate of Registration or License is located under the Correspondence tab, then under View Letters, it will be labeled "Business Authorization." You can also contact our Central Registration Division at 217 785-3707 or by email by using the "Questions, Comments, or Request" link at the bottom of this page. Please include your Illinois account ID or license number and business name in your request.