Leonard, thank you for the info. So based on the CA Guidelines for Determining Resident Status publication that you refer me to, my son would be considered as domiciled in CA. The "What form to file" section of the Guidelines would indicate that he should file a CA 540 NR (non-resident) return since he lived in Oregon for a full year yet had significant CA income. But the Who Are Residents and Non-Residents" section indicates that if he is domiciled in CA but living outside of CA temporarily, he is considered also a CA "resident." This still makes my son's situation unclear. And when TurboTax asks what state my son is a resident of, is it is really asking for residency or for the state in which he is domiciled? Also, the answer to the question of whether he should change his address from CA to Oregon on all returns is still unclear. I might have to ultimately call the CA Franchise State Tax Board, but if there is someone knowledgeable can answer my specific questions, even if it is only about the intent of the TurboTax question, I would appreciate it.
