Illinois allows an automatic extension to October 15 without filing a form. If the taxpayer receives a federal extension of more than six months, the taxpayer is automatically allowed that extension for Illinois.
To make an extension payment, use Form IL-505-I, Automatic Extension Payment for Individuals.
To access the Illinois Extension Payment, from the main menu of the Illinois state return, select:
- Miscellaneous Forms
- IL Extension of Time to File
Note: Electronic filing is not supported for the state extension payment. The federal extension payment may be sent electronically, however the state extension payment will have to be mailed.
Additional Information: