FAQ Help Contact Us

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 Us
Call IDOR Toll Free at (800) 732-8866 for questions/comments on IL-941, IL501, IL-W3.
Call IDES Toll Free at (800) 247-4984 for all other TaxNet related questions.

Write Us
TaxNet Customer Service is here to support you. Please send correspondence to:

IDES - Report and Remittance – Attn: Taxnet Administrator
33 South State Street, 10th Floor
Chicago, IL 60603

Email Us
You may also use the message form below to send an email to us.

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