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This version of the form is not currently in use and is provided for reference only. Download this version of
Instructions for Form IL-1120
for the current year.
Instructions for Form IL-1120 Corporation Income and Replacement Tax Return - Illinois
This document contains official instructions for Form IL-1120 , Corporation Income and Replacement Tax Return - a form released and collected by the Illinois Department of Revenue. An up-to-date fillable Form IL-1120 is available for download through this link.
FAQ
Q: Who needs to file Form IL-1120?A: All corporations doing business in Illinois need to file Form IL-1120.
Q: What is Form IL-1120 used for?A: Form IL-1120 is used to report income and pay the replacement tax by corporations in Illinois.
Q: When is Form IL-1120 due?A: Form IL-1120 is due on the 15th day of the 3rd month following the close of the tax year.
Q: Can Form IL-1120 be filed electronically?A: Yes, corporations can file Form IL-1120 electronically.
Q: What are the penalties for late or incorrect filing of Form IL-1120?A: Late or incorrect filing of Form IL-1120 may result in penalties and interest charges.
Instruction Details:
- This 20-page document is available for download in PDF;
- Actual and applicable for this year;
- Complete, printable, and free.
Download your copy of the instructions by clicking the link below or browse hundreds of other forms in our library of forms released by the Illinois Department of Revenue.
Download Instructions for Form IL-1120 Corporation Income and Replacement Tax Return - Illinois
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