George4Tacks
Level 15
No.
1065-X making everything zero and marking first and final, along with a lengthy explanation of the error. Attach a copy of the CP261 notice.

File a new 1120S. I doubt it can be e-filed since you already used up that EIN. Paper file along with Form 8948, along with a lengthy explanation of the error.

I bet you never make this mistake again. Welcome to the School of Hard Knocks Tax Preparation Program. My guess is that everyone responding here has attended.

Here's wishing you many Happy Returns