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How to Calculate 2021 Montana 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 Montana 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 Montana small businesses here.
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Montana State Tax Tables

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2025 Montana State Tax Witholding Table
2024 Montana State Tax Witholding Table
2023 Montana State Tax Witholding Table
2022 Montana State Tax Witholding Table
2021 Montana State Tax Witholding Table
( 2020   2019   2018   2017   2016   )

Tax rate used in calculating Montana state tax for year 2021

State Abbreviation:

MT

State Tax Withholding State Code:

30

Acceptable Exemption Form:

W-4

Basis For Withholding:

State Exemptions

Acceptable Exemption Data:

S, M / Number of Exemptions

TSP Deferred:

Yes

Special Coding:

None

Additional Information:

None


Withholding Formula (Montana 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 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 exemption allowance by applying the following guideline and subtracting this amount from the result of step 4 to compute the taxable income.

    Exemption Allowance = $1,900 x Number of Exemptions

  6. Apply the taxable income computed in step 5 to the following table to determine the annual Montana tax withholding.

    7. Tax Withholding Table

    If the Amount of
    Taxable Income Is:

    The Amount of Montana
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $           0
    $   7,000
    $       0
    plus
    1.8%
    $         0
          7,000
       15,000
         126
    plus
    4.4%
        7,000
         15,000
     120,000
         478
    plus
    6.0%
      15,000
       120,000
      and over
      6,778
    plus
    6.6%
     120,000

  7. Divide the annual Montana tax withholding by 26 and round to the nearest dollar to obtain the biweekly Montana tax withholding.

More Payroll Information for Montana Small Business

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