How Do I File an Illinois Extension?
How Do I File an Illinois Extension?
Automatic Illinois six-month extension
We automatically grant you a six-month extension of time to file your tax return. For calendar year filers, the filing date is automatically extended to October 15. You are not required to file Form IL-505-I to obtain this automatic extension. However, you must pay any tentative tax due by the original due date of your return in order to avoid any late-payment penalty and interest on unpaid tax.
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