If you owned stock traded on an exchange, income associated with it would not normally be California income under the safe harbor rule. However, if you were a partner or shareholder in a company located in California, and you were materially involved with the company, then you would have to report income associated with your investment on your California tax return.
In 2021, you would file as a part-year resident, so the income you earned before you moved back would be factored out before your tax is calculated.
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