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If the job in DE was temporary and you were still resident of CA than yes, you will have to include the income in you CA taxable income. However, if you filed DE return and paid taxes to DE you can claim credit for taxes paid to DE on your CA return to avoid double taxation.
CA will require DE tax return if you claim the credit. The purpose is to avoid double taxation, not to avoid it. If you had any taxes withheld for DE you should file a return.
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