Deadlines by entity
Calendar-year entities:
- S-corp (1120-S): March 15, extended to September 15
- Partnership (1065): March 15, extended to September 15
- C-corp (1120): April 15, extended to October 15
- Trust (1041): April 15, extended to September 30
Common questions
- Does the entity extension extend owner personal returns?
- No. Owners still file their personal returns by April 15 or extend separately. Missing K-1s due to late entity filing can leave owners scrambling.
Related
Corporation & Partnership Tax Returns
Forms 1120, 1120-S, and 1065 preparation for corporations, S-corps, and partnerships, plus owner K-1s, shareholder basis tracking, and multi-state filings.
Filing a Tax Extension
Form 4868 extends the filing deadline from April 15 to October 15, not payment. Estimate and pay what you owe by April 15 or penalties and interest accrue.