Il 1120-2026

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The document is the 2021 Form IL-1120, a Corporation Income and Replacement Tax Return for the Illinois Department of Revenue. It provides instructions for corporations to report their income, calculate taxes owed, and submit necessary documentation. The form includes sections for identifying the corporation, detailing income or loss, calculating base income, and determining net income and taxes after credits. It also outlines requirements for attachments and payment submission.

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Click ‘Get Form’ to open the IL-1120 in the editor.
Begin by entering your corporation's complete legal name in the designated field. If there has been a name change, ensure to check the appropriate box.
Fill in your mailing address accurately. If this is your first return or if you have changed your address, check the corresponding box.
Enter your federal employer identification number (FEIN) and North American Industry Classification System (NAICS) code as required.
Proceed to calculate your income or loss by following the instructions for each line item, ensuring all necessary attachments are included as specified.
Complete subsequent sections regarding deductions, taxes owed, and any applicable credits. Review each section carefully to ensure accuracy.

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Versions	Form popularity	Fillable & printable
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)