Missouri Withholding Calculator Fill in the following form to calculate your Federal and Missouri Payroll Withholding.   For Payroll in Tax Year: 2010 Gross Salary Per Pay Period:: Non-taxable Retirement Benefits: (401(k), 403(b), etc) Non-taxable Cafeteria Plan Benefits: (Medical, Child Care, etc) Pay Periods per Year: Federal Withholding Status: Single Married Federal Allowances: Missouri Withholding Status: Single Married Head of Household Married Both Working Missouri Allowances City Withholding Tax: St Louis Kansas City Other Powered by yourmoneypage.com.    This calculator is provided as a free service. No guarantee, explicit or implied, is made regarding its' accuracy or suitability to a specific purpose.