Only one 1040 form is sent ... the reg 1040 is used for an original return and the 1040X is used for an amended return ... this is how I was taught from people doing returns for 50+ years ... I will rely on their teachings. Never have any of us ever sent a new 1040 with the 1040X and never have any of these been rejected or not processed. Think about it ... if the new 1040 was required then the instructions would specifically call for it.
