the address on the W-2 has almost nothing to do with one's taxes. It's merely the address where the W-2 is to be mailed, and that's pretty much it. However, it could affect what the employer withholds from the income for state and/or local taxes. For example, if the employee updated the mailing address but did not update their tax home residence with the employer. I've seen this a few times where the mailing address is a P.O. Box that is in a different state or locale from the employee's tax home.
