Option 1: Make an online payment for your Illinois income taxes with MyTax Illinois.
Option 2: Illinois automatically grants a six-month extension to file your income tax return, giving you extra time until the October deadline. This is helpful to avoid late filing penalties if you need more time to complete your return. However, it's important to remember that this extension only applies to late filing penalties. If you owe any Illinois income tax, you still need to pay it by the original deadline to avoid interest and other penalties on unpaid taxes. You can also electronically file a federal tax extension, but this won't affect your Illinois filing requirements.
Option 3: Complete Form IL-505-I, include a Check or Money Order, and mail both to the address on Form IL-505-I. Important: Even if you filed an extension, you will still need to file your IL tax return either via eFile or by paper by the October deadline.