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

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

Tax rate used in calculating Idaho state tax for year 2021

State Abbreviation:

ID

State Tax Withholding State Code:

16

Acceptable Exemption Form:

W-4

Basis For Withholding:

State or Federal Exemptions

Acceptable Exemption Data:

S, M / Number of Exemptions

TSP Deferred:

Yes

Special Coding:

None

Additional Information:

If a state income tax certificate has not been processed or if a valid state exemption code is not present, the Federal exemptions will be used in the computation of state tax.


Withholding Formula >(Idaho 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 times 26 to obtain the annual wages.

  5. Determine the exemption allowance by applying the following guideline and subtract this amount from the annual wages to compute the taxable income.

    6. Exemption Allowance = >$2,960< x Number of Exemptions

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

    7. Tax Withholding Table
    Single

    If the Amount of
    Taxable Income Is:

    The Amount of Idaho
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $       0
    $ >12,400
    $    0.00
    plus
    0.0%
    $        0
       12,400
       13,968
          0.00
    plus
    1.125%
       >12,400
       13,968
       15,536
         18.00
    plus
    3.125%
        13,968
       15,536
       17,104
         67.00
    plus
    3.625%
        15,536
       17,104
       18,672
       124.00
    plus
    4.625%
        17,104
       18,672
       20,240
       197.00
    plus
    5.625%
        18,672
       20,240
      24,160
       285.00
    plus
    6.625%
        20,240
      24,160
      and over
       545.00
    plus
    6.925%
      24,160


    Married

    If the Amount of
    Taxable Income Is:

    The Amount of Idaho
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $        0
    $  >24,800
    $      0.00
    plus
    0.0%
    $        0
        24,800
         27,936
            0.00
    plus
    1.125%
      >24,800
        27,936
       31,072
          35.00
    plus
    3.125%
        27,936
      31,072
       34,208
        133.00
    plus
    3.625%
      31,072
      34,208
       37,344
        247.00
    plus
    4.625%
      34,208
      37,344
       40,480
        392.00
    plus
    5.625%
      37,344
      40,480
       48,320
        568.00
    plus
    6.625%
      40,480
      48,320
       and over
        1087.00
    plus
    6.925%
      48,320

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

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