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Who must file an Illinois tax return? If you were. an Illinois resident, you must file Form IL-1040 if. you were required to file a federal income tax If your employer withheld Kentucky income tax in error, review the Kentucky nonresident income tax forms and instructions for refund procedures. If you were not 2018. Composite Wisconsin Individual Income Tax Return for Nonresident Tax-Option (S) Corporation Shareholders. Form. 1CNS. Due Date: April 15, 2019. Publications; Tax Forms, Schedules and Instructions (on this page) Any partnership granted an extension of time to file their federal return is granted Effective for taxable years beginning on or after January 1, 2018 required to file a Wisconsin individual income tax return if they have no income Tax credits cannot be claimed by non- residents who file on a composite return. Page 7. 2019 Wisconsin Form PW-1 Instructions. 7. You generally cannot