If you have an amount in box 16 (state wages) your company has identified your wages as taxable by Mississippi (MS). If you have an amount in box 17 (state income tax withholding) it means that money was held out of your check for MS taxes.
You should ask your company why your income is reported as taxable by MS. If it is correct, you need to file a MS nonresident tax return. If it is wrong and you paid MS taxes, you may have to file a MS nonresident return to get the MS taxes refunded.
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