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Corporate Tax Forms Purposes and
Due Date

S-Corporation C-Corporation
Purpose

S-Corporation uses Form 1120-S to report income, losses, and dividends of S-Corporation shareholders.

C-Corporation uses Form 1120 to report the IRS about their income, gain, losses, deductions, and credits.

Due Date

The due date to file Form 1120-S is usually the 15th day of the third month after the end of the tax year.

March 15, 2021

File Extension Now

The due date to file Form 1120 is the 15th day of the fourth month after the end of the tax year.

April 15, 2021

File Extension Now

Note: The extension will vary based on the Form type and the tax year end period.

Please find your extended due date for your corporate tax return by hitting the button below.

Find my Extended Due Date

Tax Extension for S-Corp and C-Corp Tax Returns (1120-S, & 1120)

S-Corportation C-Corportation
Deadline to file extension

S-corporation that is looking to extend the filing deadline must file the extension Form 7004 by the original due date of Form 1120-S.

March 15, 2021

File Extension Now

Applying an extension for S-Corporation will give an additional 6 month of time to file Form 1120-S.

April 15, 2021

File Extension Now
Extension of Time

Applying an extension for S-Corporation will give an additional 6 month of time to file Form 1120-S.

C-Corporation that applies an extension will usually get a six month extension of time to file their original tax return.

Extended Due Date to file tax returns

The extended due date to file Form 1120-S will be on September 15.

The extended deadline to file Form 1120 will be on October 15.

Extend your Corporate Tax Filing Deadline Now!