If you are unable to find the information you need and want to contact our
customer service department, you can contact us via email, phone or postal
mail. We'll be happy to assist you. A customer service representative will respond to you during
normal business hours, 8:30AM - 5:00PM Monday through Friday, except for State holidays.
Call IDOR Toll Free at (800) 732-8866 for questions/comments on IL-941, IL501, IL-W3.
Call IDES Toll Free at (866) 274-5697 for all other TaxNet related questions.
TaxNet Customer Service is here to support you. Please send correspondence to:
IDES - Magnetic Media Unit - Attn: TaxNet Administrator
33 South State Street
Chicago, IL 60603
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