That is correct. Your state of residence can tax all your income, regardless of where you earned it. A temporary absence from your home state for work or school does not constitute a change in residency. Non-resident states can tax you for income earned within their borders, but this is not an issue in your case, because Washington State does not have a personal income tax.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
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