Income earned as a MO resident is allocated to MO; income earned as a MS resident is allocated to MS. For the tax year in which you moved, you will file a part-year resident return in each of the two states.
If your employer incorrectly continued to withhold MO taxes after your move to MS, you are entitled to a refund of the incorrectly withheld portion.
If your employer cannot or will not withhold MS taxes, you may want to consider making estimated tax payments to MS.
If you no longer are a resident of nor physically work in MO, you should request your employer to cease withholding MO taxes.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
