You are a resident of your state where your drivers license, voting records, bills, banking and normally where you plan to return home. CA has stricter laws than most states and will attempt to tax all income as resident income. They could in fact be residents of 2 different states since you say neither plan to live in Idaho.
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**Mark the post that answers your question by clicking on "Mark as Best Answer" I am NOT an expert and you should confirm with a tax expert.
