Beginning with the 2017 filing season, partnership returns will be due on March 15 (the 15th day of the third month for fiscal year partnerships).
C corporation returns will be due on April 15 (the 15th day of fourth month for fiscal year corporations).
S corporation returns will continue to be due on March 15. The due date for LLC returns depends on whether the LLC is treated as a partnership, C corporation, or S corporation. California FTB conforms to the federal changes.
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