The due date for filing Form 1120 is the 15th day of the 4th month after the end of the corporation’s tax year. For calendar year corporations, the due date is April 15th. However, corporations can request an automatic 6-month extension by filing Form 7004, which extends the due date to October 15th for calendar year corporations. See 26 U.S. Code § 6072 for more details on due dates for corporation returns.
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