What is the extended due date for 1120-S?
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Last modified 2/24/2026 5:12:09 AM EST
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The extended due date for an S-Corporation to file Form 1120-S is September 15. This 6-month automatic extension is from the original due date of March 15, which is the actual calendar year deadline for filing Form 1120-S. You can obtain the extension by filing Form 7004 on or before the original due date of the return.
To learn how to e-file Form 7004 in ExpressExtension, click here.
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