Illinois
State of Illinois Personal Income Tax Extensions
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IRS Form 4868
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General Instructions
Choose your state from the list below to access detailed instructions for both business and personal tax extensions.
Individual income tax returns are due by April 15, in most years — or by the 15th day of the 4th month following the end of the taxable year (for fiscal year filers).
Illinois offers a 6-month extension, which moves the filing deadline from April 15 to October 15 (for calendar year filers).
Illinois tax extensions are automatic, which means there is no application or written request to submit.
An extension of time to file is not an extension of time to pay your Illinois income tax. All state tax payments are due by the original deadline of the return. Any Illinois tax not paid by the proper due date will be subject to interest and penalties. You can make an Illinois extension payment with Form IL-505-I, or pay electronically through Illinois WebPay for Individual Income Tax: www.revenue.state.il.us/webpay
If you have an approved Federal tax extension (IRS Form 4868), you will automatically receive an Illinois tax extension. However, if you owe Illinois tax, it must still be paid by the original due date.
NOTE: If you owe zero Illinois tax, you will be granted an automatic state extension without having to file anything.
Illinois State Income Tax Payment Forms
Extend your business tax return due date by 6 months in minutes! Use FileLater to e-file Form 7004 for IRS Forms 1120, 1120S, 1065, and more.
Website: Illinois Department of Revenue
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Form IL-505-I