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How to Calculate 2018 Missouri State Income Tax by Using State Income Tax Table

1. Find your income exemptions

2. Find your pretax deductions, including 401K, flexible account contributions ...

3. Find your gross income

4. Check the 2018 Missouri state tax rate and the rules to calculate state income tax

5. Calculate your state income tax step by step

6. If you want to simplify payroll tax calculations, you can download ezPaycheck payroll software, which can calculate federal tax, state tax, Medicare tax, Social Security Tax and other taxes for you automatically. You can try it free for 30 days, with no obligation and no credt card needed.

Learn more about the in house payroll tax solution for Missouri small businesses here.
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Missouri State Tax Tables

Tax rate used in calculating Missouri state tax for year 2018

State Abbreviation: MO
State Tax Withholding State Code: 29
Basis for Withholding: State exemptions and the amount of Federal Income Tax witheld each pay period.
Acceptable Exemption Form: MO W-4
Acceptable Exemption Date: S, M, N, H/Total Allowance Claimed
TSP Deferred: Yes
Special Coding:

Determine the Total Number of Allowances Claimed field as follows:
First position - S = Single;
M = Married, One Spouse Working;
N = Married, Both Spouses Working;
H = Head of Household
Second and Third Positions - Enter the total number of allowances claimed. If less than 10, precede with a zero.

Additional Information: None

Withholding Formula >(Missouri Effective 2018)<
  1. Subtract the nontaxable biweekly Thrift Savings Plan contribution from the gross biweekly wages.

  2. Subtract the nontaxable biweekly Federal Health Benefits Plan payment(s) (includes dental and vision insurance program, and flexible spending account - health care and dependent care deductions) from the amount computed in step 1.

  3. Add the taxable biweekly fringe benefits (taxable life insurance, etc.) to the amount computed in step 2 to obtain the adjusted gross biweekly wages.

  4. Multiply the adjusted gross biweekly wages by 26 to obtain the annual wages.

  5. Determine the standard deduction by applying the following guideline and subtract this amount from the annual wages.

  6. If the Employee Is: The Standard Deduction Is:
    Single >$6,350
    Married (One Spouse Working) 12,700
    Married (Both Spouses Working) 6,350
    Head of Household 9,350<

  7. Determine the exemption allowance by applying the following guideline and subtract this amount from the result of step 5:

  8. If the Employee Is
    Claiming Status As:

    Then the Exemption
    Allowance Should Be:

    Single claiming 1 exemption $ 2,100
    Married claiming 1 exemption    2,100
    Head of Household, claiming 1 exemption    3,500
    Head of Household, claiming 2 exemptions and each additional exemption thereafter    1,200

  9. Multiply the biweekly Federal income tax withholding (calculated each pay period) by 27 to compute the annual Federal income tax withholding* and subtract this amount from the result of step 6.

  10. * Maximum of $5,000 for Single/Head of Household and Married (Both Spouses Working)
      Maximum of $10,000 for Married (One Spouse Working)

  11. Apply the taxable income computed in step 7 to the following table to obtain the annual Missouri tax withholding.

  12. Tax Withholding Table

    If the Amount of
    Taxable Income Is:

    The Amount of Missouri
    Tax Withholding Should Be:


    But Not



    Of Excess

    $       0 $1,008 $    0 plus 1.5% $      0
      1,008   2,016     15 plus 2.0%   1,008
      2,016   3,025     35 plus 2.5%   2,016
      3,024   4,032     60 plus 3.0%   3,024
      4,032   5,040     90 plus 3.5%   4,032
      5,040   6,048   125 plus 4.0%   5,040
      6,048   7,056   165 plus 4.5%   6,048
      7,056   8,064   210 plus 5.0%   7,056
      8,064   9,072   260 plus 5.5%   8,064
      9,072   and over   315 plus 6.0%   9,072

  13. Divide the annual Missouri tax withholding by 26 and round to the nearest dollar to obtain the biweekly Missouri tax withholding.

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