Thanks DaveF1006 for the detailed explanation. I really appreciate it. If I am filing my federal 1040 with a Form 8833, when it comes to the state tax return and in case it asks to attach my federal return, is Form 8833 considered as a part of my "federal return" by the state? Or the state tax return only wants Form 1040 when it refers to "federal return"? Is it required to mail a copy of my Form 8833 to the state tax office?
