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About Form 1120-S, U.S. Income Tax Return for an S ...
Information about Form 1120-S, U.S. Income Tax Return for an S Corporation, including recent updates, related forms, and instructions on how to file. Form 1120-S is used by corporations that elect to be S corporations to report income, deductions, gains, losses, etc.
Instructions for Form 1120-S (2025) - Internal Revenue Service
An S corporation making a section 336 (e) election generally must file Form 1120-S (with the section 336 (e) election statement attached) for its tax year ending on the date of the qualified stock disposition by the 15th day of the 3rd month after the date of the qualified stock disposition.
1120 & 1120-S Due Dates: When Corporate Returns Are Due
Form 1120-S is due on the 15th day of the third month after your S corporation’s tax year ends. For most calendar-year filers, that lands on March 15, moved to March 16, 2026, because March 15 falls on a Sunday.
Entity is Dissolved: When is a tax return due? - Support
Corporation - A corporation that has dissolved must file its final return by the 15th day of the fourth month after the date it dissolved. S corporation dissolved - An S corporation that has dissolved must file its final tax return by the 15th day of the third month after the date it dissolved.
S Corp Tax Deadline: Form 1120-S Due Dates for 2026 and 2027 ...
The S corp tax return, Form 1120-S, is due the 15th day of the 3rd month after the tax year ends: March 16, 2026 for 2025 calendar-year returns and March 15, 2027 for 2026.
Form 1120-S Due Date | S Corporation Filing Deadlines & Penalties
When is Form 1120-S Due? The following table lists the standard due dates for filing Form 1120-S. Calendar-year filers have a deadline in March that never changes. Fiscal-year filers, however, must file by the 15th day of the 3rd month after the close of their tax year.
Short Year S-Corp tax return due date? | Community
Generally, an S corporation must file Form 1120-S by the 15th day of the 3rd month after the end of its tax year. For calendar year corporations, the due date is March 17, 2025 (March 15th falls on Saturday).
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