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Business Income Tax Estimated Payments |
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Calendar Year Corporate Income Tax Estimated Payment Due Date is September 15
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Corporations, that file Form IL-1120, Corporation Income and Replacement Tax Return, or IL-990-T, Exempt Organization Income and Replacement Tax Return, who reasonably expect their income and replacement tax liability to be more than $400 must make quarterly estimated payments.
Estimated payments are due on the 15th day of the 4th, 6th, 9th, and 12th months of the tax year.
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How can I make my estimated tax payment?
Pay using a check or money order (follow the payment instructions on Form IL-1120-V or Form IL-990-T-V).
An electronic payment may be made using your MyTax Illinois account, third-party software, or ACH credit (if already set up with your financial institution).
Need help?
See the Estimated Payment Worksheets Appendix in your Form IL-1120 or Form IL-990-T instructions.
For more information, visit our website at tax.illinois.gov or contact us.
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