State of Illinois Personal Income Tax Extensions

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General Instructions

The State of Illinois uses the same filing period as the IRS / Federal government. Therefore, Illinois personal income tax returns are due by the 15th day of the 4th month following the end of the tax year (April 15 for calendar year filers). If you cannot file by that date, you can get a state tax extension.

An Illinois personal extension will give you 6 more months to file your return, moving the deadline to October 15 (for calendar year taxpayers).  Illinois extensions are automatic, which means that you don’t need to submit a written request in order to obtain one. If you have a valid Federal tax extension, you will automatically be granted an extension for Illinois. However, you are still required to pay your Illinois income tax by the original deadline (April 15) to avoid penalties.

A tax extension does not give you more time to pay your state tax balance. If you owe tax, you can make a payment using Illinois Form IL-505-I (Automatic Extension Payment for Individuals Filing Form IL-1040). An extension payment can also be made electronically using the Illinois WebPay system. Individuals who owe zero state tax don’t have to do anything to receive the automatic extension. If you’re unsure whether you owe Illinois tax, fill out the worksheet on Form IL-505-I.

For more information, please visit the Illinois Department of Revenue website.

Illinois State Income Tax Payment Forms

Form IL-505-I (Automatic Extension Payment for Individuals Filing Form IL-1040)

Mail Form IL-505-I with payment to the following address:

Illinois Department of Revenue
P.O. Box 19005
Springfield, IL  62794-9005