Illinois Business Information
Links to information and resources for starting, running, expanding, relocating, or closing a business
Related Services
IDOR
Certificate of Resale
Learn more about Certificate of Resale requirements for Illinois businesses.
IDOR
Business Tax Account Summary
View e-Services available for businesses.
IDOR
Withholding Income Tax Web Filing
File Withholding Income Taxes online with MyTax Illinois.
IDOR
Excise Tax Web Filings
IDOR
Taxes at Fairs Festivals Flea Markets and Craft Shows
View information on Illinois sales tax requirements for retailers.
IDOR
Sales Tax Web Filing
File sales taxes online utlizing MyTax Illinois.
IDOR
Closing Your Business
Contact IDOR when closing a business to determine tax liabilities.
IDOR
Withholding Tax Coupon Booklet Requests
Make your IL -501 payment online here.
IDOR
Business Taxes Web Pay
Make business tax payments online with MyTax Illinois.