California taxes the CA percentage of total income and not California-only income. That why all your income is included in the initial computation of your base tax.
For example, if you earned $100,000 total and $30,000 in CA, your tax rate would be based on $100,000. Say the CA tax on $100,000 is $10,000. Then your tax would be 30% ($30,000/$100,000) of $10,000 or $3,000.
If most of you income was received while living in Washington then your California income percentage will be small.
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