Additionally, if your employer incorrectly withholds state income tax from the state that they are located in, as well as the state that you reside in- then you may want to file a nonresident return in order to claim any state withholding taken out for your employers state and a resident return for the state where you live. Then, you should contact your employer and update your state information and forms to reflect your current resident address for your state withholding information.
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