In the Personal Info section of TT, enter CA as your State of Residence, and indicate that you also lived in IL. You became a legal resident of CA on the date you began living there with the intent of making it your new primary home.
Doing this will prompt the program to generate the correct tax forms for each state.
Then follow the directions in this TT help article:
How do I file a part-year state return? (intuit.com)
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
