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- Click ‘Get Form’ to open the IL-1120 in the editor.
- Begin by entering your corporation's complete legal name and mailing address in Step 1. If applicable, check the box for a name change or if this is your first return.
- In Step 2, report your federal taxable income from U.S. Form 1120, Line 30. Ensure you attach a copy of your federal return.
- Proceed to Step 3 to calculate your base income or loss. Follow the instructions carefully for each line item, ensuring accuracy in reporting additions and subtractions.
- Complete Steps 4 through 9 by calculating your net income and any taxes owed. Be sure to check all boxes that apply based on your business activities.
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| Versions | Form popularity | Fillable & printable |
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| 2025 | 4.5 Satisfied (46 Votes) | |
| 2023 | 4.2 Satisfied (29 Votes) | |
| 2022 | 4.8 Satisfied (31 Votes) | |
| 2021 | 4.8 Satisfied (52 Votes) | |
| 2020 | 4.4 Satisfied (249 Votes) | |
| 2019 | 4.3 Satisfied (157 Votes) | |
| 2018 | 4.3 Satisfied (201 Votes) | |
| 2017 | 4.4 Satisfied (189 Votes) | |
| 2016 | 4.4 Satisfied (113 Votes) | |
| 2015 | 4 Satisfied (38 Votes) | |
| 2014 | 4.3 Satisfied (64 Votes) | |
| 2013 | 4 Satisfied (35 Votes) | |
| 2012 | 4.3 Satisfied (56 Votes) | |
| 2011 | 4.3 Satisfied (65 Votes) | |
| 1998 | 4 Satisfied (59 Votes) |
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