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How to Calculate 2021 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 2021 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 2021

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 2021)<
  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 >$12,550
    Married (One Spouse Working) 25,100
    Married (Both Spouses Working) 12,550
    Head of Household 18,800<

  7. Apply the taxable income computed in step 5 to the following table to obtain the annual Missouri tax withholding.

  8. Tax Withholding Table

    If the Amount of
    Taxable Income Is:

    The Amount of Missouri
    Tax Withholding Should Be:


    But Not



    Of Excess

    $       0 $1,088 $    0 plus 1.5% $      0
      $1,088   2,176     16 plus 2.0%   $1,088
      2,176   3,264     38 plus 2.5%   2,176
      3,264   4,352     65 plus 3.0%   3,264
      4,352   5,440     98 plus 3.5%   4,352
      5,440   6,528   136 plus 4.0%   5,440
      6,528   7,616   180 plus 4.5%   6,528
      7,616   8,704   229 plus 5.0%   7,616
      8,704   and over   283 plus 5.4%   8,704

  9. 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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