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Get your taxes done using TurboTax
Yes, if you are mailing your Illinois State return in.
"Attach your W-2 and 1099 forms to support the amount you claim as Illinois Income Tax withheld on Line 26.
Include any required attachments (e.g., Schedule M, Schedule ICR, Schedule CR, page 1 of your federal return) with your Form IL-1040."
‎June 6, 2019
3:18 AM