File Form IL-1040, Individual Income Tax Return, on MyTax Illinois MyTax Illinois
Corporationswill use Form 1120 and partnershipswill use Form 1065 to file their annual returns. Here’s what extension filers need to know about the October deadline. We'll contact you by mail if we need more information to process your return. To calculate interest on past-due taxes, visit Interest Owed and Earned. InterestPast-due taxes are charged interest beginning 61 days after the due date. Let dedicated tax professionals handle interactions with the IRS on the off chance you get audited over the next three years after you file your return. You may not have filed a tax return because your wages were below the filing requirement. But you can still file a return within three years of the filing deadline to get your refund. Have your Social Security number, filing status, and the exact whole dollar amount of your refund ready. Taxpayer Education Click here to access informational videos and other educational resources. Please refer to theE-File Servicepage for details on the...