Mississippi Income Tax Withholding Payment and Filing Requirements
Employers in Mississippi must conform with these state rules relating to filing income tax withholding returns.
Periodic Returns. Monthly (Form 89-105) due by 15th day of following month. Quarterly (Form 89-105) due by 15th day of month following end of quarter.
Annual Reconciliation Returns. Form 89-140 due January 31 or within 30 days of last month in which wages are paid.