The Missouri State Agency that oversees the collection and reporting of State income taxes deducted from payroll checks is:
Department of Revenue
Division of Taxation and Collection
Withholding Tax Section
P.O. Box 3375
Jefferson City, MO 65105-3375
(573) 751-5752
http://www.dor.mo.gov/
Missouri requires that you use Missouri form “MO-W4, Employee’s Withholding Allowance Certificate” instead of a Federal W-4 Form for Missouri State Income Tax Withholding.
Not all states allow salary reductions made under Section 125 cafeteria plans or 401(k) to be treated in the same manner as the IRS code allows. In Missouri cafeteria plans are not taxable for income tax calculation; not taxable for unemployment insurance purposes. 401(k) plan deferrals are not taxable for income taxes; taxable for unemployment purposes.