You should file Form IL-1040-X, Amended Individual Income Tax Return, if you need to change a previously filed Form IL-1040, Individual Income Tax Return and your change affects items used to figure your Illinois net income or credits.
Your change can occur from a state change or a federal change such as:
- an amendment of your federal income tax return
- an adjustment made by the Internal Revenue Service (IRS)
- any other recomputation or redetermination
You should file Form IL-1040-X only after you have filed a processable Illinois Income Tax return. A separate Form IL-1040-X must be filed for each tax year you wish to change.
| Form name | Instructions | Form |
|---|---|---|
| 2007 Illinois Tax Form 1040-X - Amended Individual Income Tax Return |   |
|
| 2006 Illinois Tax Form 1040-X - Amended Individual Income Tax Return | - | |
| 2005 Illinois Tax Form 1040-X - Amended Individual Income Tax Return | - | |
Keeping Your Data Protected