What form should be used for LLC tax return

[shyam2]

The LLC was started in Oct 2021. The Scorp election form 2253 was submitted in Jan and IRS has not processed it yet. The election effective date in 2253 was the LLC start date of Oct 2021.  The entity has only one member.

What form should be used for 2021 tax filing?

[Mike9241]

the question is will the iRS approve the election?  also, did you select a fiscal year or calendar year.

A corporation or other entity must file Form 1120-S if (a) it elected to be an S corporation by filing Form 2553, (b) the IRS accepted the election, and (c) the election remains in effect. After filing Form 2553, you should have received confirmation that Form 2553 was accepted. If you didn't receive notification of acceptance or nonacceptance of the election within 2 months of filing Form 2553 (5 months if you checked box Q1 to ask for a letter ruling), please follow up by calling 1-800-829-4933. Don't file Form 1120-S for any tax year before the year the election takes effect.

if granted and you selected a calendar year had no activity in 2021, a 0 return was due for 2021.  if granted  and you selected a calendar year, the 2021 return is now late. it was due 3/15/2022.

get hold of the IRS.  only it can tell you what needs to be filed.