Since you are an Oregon Resident, Oregon taxes all of your income no matter where the income is sourced. If the income is California-sourced income, then you are taxed in both states: California and Oregon. To reduce the effect of double-taxation, California and Oregon have a "reverse credit" agreement. Usually, the nonresident state (in this case, California), taxes the income first, and then you claim a credit for the income tax on the resident return (Oregon). The reverse credit arrangement goes in the opposite direction: your resident state taxes the income, and then you claim a credit for the taxes paid on the California return.
Because of this arrangement, prepare the Oregon return first, and then, on the nonresident California return, you will see a section about taxes paid to reverse credit states. You will be able to claim the Oregon tax on that section of the California return.
Because of this arrangement, you may wish to have your company make sure they are withhodling Oregon tax on the RSUs (if it is still needed to do so), because you will pay tax to Oregon for RSUs included in your income.
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