Corporations (including S and C Corps) - C corporations (Form 1120) also file on April 15, 2025. S corporations (Form 1120S) and partnerships (Form 1065) file on March 17, 2025. If you already ...

C-Corporations and LLCs taxed as corporations can file Form 7004 to extend the deadline for Form 1120 by an additional 6 months. To be valid, these extension forms must be submitted by midnight on ...