Yes- in general, California nonresidents or part-year residents determine their California tax by multiplying their California taxable income by an effective tax rate.
The effective tax rate is the California tax on all income as if you were a California resident for the current tax year (and for all prior taxable years for any carryover items, deferred income, suspended losses, or suspended deductions) divided by that income. This method ensures that nonresidents pay the correct tax on their California sourced income and does not tax non-California sourced income.
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