You will only be taxed in Virginia. Although there are states that do consider a nonresident teleworker to be earning nonresident income, California is not one of them. And even if they did, California and Virginia have a "reverse credit" agreement (which is a hybrid reciprocal agreement) that would make all of your income taxable in Virginia anyways. You are wise to ask the question, but in this case, you will only be taxed in and only have to file for Virginia.
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