When is Small Corporation Tax Return Due? 1120S

Question:  When is Small Corporation Tax Return Due?  1120S

Answer:  Corporations that elected for S-Corp status always follows the calendar year.  All S-Corp (Small Corporation) has December 31 as year ending date.

S-Corp that returns are due on the 15th day of the third month following the close of tax year.   Basically, all S-Corp tax returns are due on March 15 of the following year.

  • 2020 S-Corp Tax Return (1120S) is due on March 15, 2021
  • 2021 S-Corp Tax Return (1120S) is due on March 15, 2022
  • 2019 S-Corp Tax Return (1120S) is due on March 15, 2020

You have to file Form 1120S for Small Corporation Tax Returns.  Form 1120 is for normal Corporation Tax Returns.

To file an extension, you need to file Form 7004 which extends the tax deadline for six months.

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