Yes, you do need to file a California state tax return. Since you earned (have California-sourced income) $20,000 from working in California, you must report this income to California as a nonresident.
You'll likely need to file the California Nonresident or Part-Year Resident Income Tax Return (Form 540NR)
Click here for Steps to file a non-resident return
When you prepare your state returns, make sure to do the NON-resident return first, before you prepare the state return for the state you live in.
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