After you file


@Anonymous wrote:

NO.  the deadline for an unextended S-corp (as well as other calendar year returns for C-Corps, Partnerships, and Estate and Trusts) was not changed for Covid. It was 3/16/2020. 


That is part of the reason this is so confusing; returns that were due on April 15th (or later) were extended while those due prior to April 15th were not extended.

 

Calendar year returns for C corporations (Form 1120) and estates/trusts (Form 1041) were due on April 15th and those dates were extended.