Learn how to do business with the state and sell products and services as a vendor
Learn more about Certificate of Resale requirements for Illinois businesses.
View e-Services available for businesses.
File Withholding Income Taxes online with MyTax Illinois.
View information on Illinois sales tax requirements for retailers.
File sales taxes online utlizing MyTax Illinois.
Contact IDOR when closing a business to determine tax liabilities.
Make your IL -501 payment online here.
Make business tax payments online with MyTax Illinois.