If you scheduled a payment of X is it because 1040 says amount you owe is X?
or 1040-X says amount you owe is X ?
any amount you already paid before 1040-X does its arithmetic should be on 1040-X Line 16.
IRS: says
processing of e-Filed and mailed amenments is the same.
It's just that e-File is much more convenient and less error-prone.
@hjkm
