For proper Missouri tax withholding, the Annual Standard Deduction amount must be entered in the next to last field in each employee's record.
The Annual Standard Deduction amount and withholding tax formula can be found on the 2020 Missouri Withholding Tax Formula on the Missouri website page below:
The Annual Standard Deduction Amount is shown below:
Single - $12400
Married (both spouses working) - $12400
Married (one spouse working) - $24800
Head of Household - $18650
Note that there is no longer a withholding allowance, and the federal income tax amount for the pay period is no longer deducted in the withholding calculation.