One of the primary reasons for determining your state of residency is for determining any state income taxes that you may owe. Regardless of your state of residency, if you work in a state that has a state income tax, you are liable for taxes on the income you earn in that state. I am a CPA but I am not familiar with the requirements of each particular state. The best advice I can give is that if there is a potential question of liability, to discuss it with someone familiar with the tax laws of the state in question.
Mark
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