2018 IL-941 Illinois Withholding Income Tax Return
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- Click here to file your IL-941 online
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Please note: To allow for your IL-941 to be processed correctly, you must first type in your Federal ID number, your sequence number (if different than 000), and the reporting period before printing this document.
For future forms, order personalized, preprinted forms by calling the Taxpayer Assistance Division at 1 800 732-8866, 1 217 782-3336, or our TDD (telecommunications device for the deaf) at 1 800 544-5304.