Annie , I would recommend the following :
1. File the 1040x amended for 2018 just for the record . You can use TT Amend feature that does it pretty much automatically . Now on page 1 remember the numbers really don’t change . You are only amending an erroneous box that was checked by the TT software error . Page 2 in the narrative section just describe ... “ This amended return is to correct a box that was checked in error by the Turbo Tax software . When I filed Married Separate , the software check the box “spouse can be claimed as a dependent “ This amended return is to accordingly correct the record . In conjunction with this , my stimulus was check of $1200 was never issued because of this software error . I ask the Service to please issue my entitled payment . Thank you for your kind attention to this important matter . PS please note my address has since changed from my original 2018 filing . Please us this updated address . “
2. So use your current address on the 1040x as noted above .
3. If a 2nd stimulus is used I’m sure they will use 2019 as the basis so this 2018 problem goes away .
4. Also remember that when you file 2020 next year the IRS provides a new form to claim the $1200 if it wasn’t received . So even if nothing happens with the 1040x there will be a way to get it I’ve seen the drafted form and it’s fairly simple . I’m sure TT will have it in their 2020 software .
Ok hope this helps . Jim
