A 1040X filed by the original due date is considered a superseding return (it's in the IRM somewhere but I'm too lazy to look it up now).  If you're going to try to efile, wait until the original return is processed first (mine was finally processed last week and my deposit scheduled for 3/2, woohoo!)

I certainly am sure Lisa - this was my own return! We divorced in 2015. Former husband died 9/21 and I simply forgot. Would like to correct as quickly and easily as possible.

Thank you, that was my understanding of a superceding return also. If I “correct” the return and efile again, I’m concerned that I will mess up the system, but I sure don’t want to mail anything. I tried doing a 1040X, but efile was not an option. Original return had a balance due and direct debit scheduled for 4/14. Now there is additional tax due. Would appreciate any suggestions!