@agisser
If you e-Filed 1040 you get one shot to e-File 1040-X before Oct 15.
If you find the 1040-X was in error after you submit that, you have to file a paper 1040-X No.2.
If the IRS makes any changes to your 1040 and you find out after you submitted 1040-X No.1 you have a second problem on your hands. Paper 1040-X currently takes eight months or longer to get through IRS processing.
Doing 1040-X with figures "as previously adjusted" by IRS, per instructions, is tricky enough, and requires that you know what IRS did.
