An individual must file a return if either their gross income or their adjusted gross income (AGI) was more than the amount defined by law. California residents must consider their total worldwide gross income to determine their filing requirement.
| Form name | Instructions | Form |
|---|---|---|
| 2008 Illinois Tax Form IL-1040 - Individual Income Tax Return |   |
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| 2007 Illinois Tax Form IL-1040 - Individual Income Tax Return | |
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| 2006 Illinois Tax Form IL-1040 - Individual Income Tax Return | - | |
| 2005 Illinois Tax Form IL-1040 - Individual Income Tax Return | - | |
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