If you are filing the California nonresident tax return, you determine your California tax by multiplying your 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 taxable year and for all prior taxable years for any carryover items, deferred income, suspended losses, or suspended deductions, divided by that income.
Use the following formula:
Prorated tax = CA taxable income × Tax on total taxable income ÷ Total taxable income
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