In my case, the numbers from a K-1 were not entered into the 2020 return, so I have been waiting until this week to begin the amended return.
BTW, the return was mailed to IRS on Oct 12, 2021; just this week showed up as processed.
On the 1040X form, the amounts of the extension payment (Line 16) did not fill into the form - even though it shows up on all the linked pages for that amount. Had to override to fill that box and get numbers to zero, before I even start with the extra data.
Any thoughts on that ?
fingers crossed !!
