If your only California-sourced income was from your internship, you were only in California temporarily, and were a California nonresident all year, then you would only need to report your California earnings on a California Nonresident return.
When entering your personal information in TurboTax, state that you were a resident of your home state all year. If you tell TurboTax that you were a part-year resident of California, it will want to allocate your non-California income for the period of time you reported that you were a California resident.
See the California Instructions for Form 3800 (the 2024 version is the latest available online) for more information.
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