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S -corporation Tax Returns

March 15

For S-corporation tax returns are due on March 15, 2021.
The extended deadline is Sept. 15, 2021. The deadline for S-corp and partnership returns is the 15th day of the fourth month following the end of the fiscal year, if they’re on a fiscal year rather than a calendar year.

Form 1120-S instructions and Form 1120-S

Details

Date:
March 15