You must file Form IL-1040-X, along with proper supporting documentation, for both corrected and amended returns. If you are changing your Illinois return due to a change to your federal return that resulted in an overpayment, do not file this form until you receive.Articles of organization are amended as follows (check applicable item(s) below): . All forms are ADA accessible, and you can handwrite or type into the PDF form to fill it out. All forms about the filing requirements of the Illinois Limited Liability Company Act can be obtained from the Limited Liability Company publications section. You can amend it for the 2023 tax year using Form IL-1040-X. This is different from the IRS Form 1040X used for federal amendments. I printed my Illinois tax return and it also printed the federal 1040. Do I attach the federal 1040 to my Illinois return? My workforce will print our daily tasks, today the print format has changed.