S Corporations, partnerships and multi-member LLC's filing Form 1120S, and with a calendar tax year ending December 31 should file form 7004 by March 16, whereas, those with the fiscal year should file the extension by 15th day of the third month after the end of the company's fiscal (financial) year.
C Corporations filing Form 1120, and with a calendar tax year ending December 31 should file form 7004 by July 15, whereas, those with the fiscal year should file the extension by the 15th day of the fourth month after the end of the company's fiscal (financial) year.
To learn more about the extension of time granted, refer Extension Due Dates.
