@cdelei
Since you claim Idaho as your resident/domicile state under MSRRA, you should fill in a new form DE4 and give it to your CA employer to get CA withholding stopped. Once it has been stopped for a full year, you wouldn't have to file a CA tax return at all (Unless you had some other type of CA income...( like for being self-employed in CA...or owning a rental property in CA you might get income from).
Every state with an income tax ,that you are posted to, has a similar withholding form to stop the state taxes from being withheld....then you may only have to file for ID, and not the state you are posted to.
You'd check the box at #4.
https://www.edd.ca.gov/pdf_pub_ctr/de4.pdf
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
