@Marc22 --
Q: "If I am domiciled in CA and are not moving, but just live in Utah part of the year and CA the other part of the year, I am a full year resident of CA and a part year resident of Utah; rather than part year resident of each state?"
No. If you are domiciled in CA all year, for tax purposes you would be a full-year resident of CA and a non-resident of UT. In that situation ALL your income is taxable by CA, and UT could tax you only on UT-source income. Some examples of UT-source income would be income from work carried out in UT or rental income from a property located in UT. Unearned income such as retirement income or capital gains would be taxable only by your domiciliary state of CA.
If you had UT-source income and thus had to file a non-resident UT tax return, CA would give you a credit.
In the Personal Info section of TurboTax, you would enter CA as your State of Residence, and you would answer NO to the question about living in another state. If you had UT-source income, you would enter UT in the Other State Income section of Personal Info.
Again, a part-year resident is someone who literally moves their domicile from one state to another during the tax year (their main, primary residence). If your domicile is CA, you remain a resident of CA for tax purposes, no matter how much time you spend at a second home in another state.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
