According to this Illinois webpage:
- As a nonresident, you must file Form IL-1040 and Schedule NR if
- you earned enough taxable income from Illinois sources to have a tax liability ( i.e., your Illinois base income from Schedule NR, Step 5, Line 46, is greater than your Illinois exemption allowance on Schedule NR, Step 5, Line 50), or
- you want a refund of any Illinois Income Tax withheld in error. You must attach a letter of explanation from your employer.
After completing the Federal return, prepare a nonresident Illinois return if needed under these requirements. Follow the instructions in TurboTax. Note the amount of your tax liability for Illinois. Then, prepare your California resident return. California allows a credit for the amount of tax paid to another state.
See this help article for more information about filing if you have income from multiple states.
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