View information on Illinois sales tax requirements for retailers.
Learn more about Certificate of Resale requirements for Illinois businesses.
View e-Services available for businesses.
File Withholding Income Taxes online with MyTax Illinois.
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.