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How to Calculate 2018 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 2018 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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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 Idaho State Tax Witholding Table
( 2019   2018   2017   2016   2015   )

Tax rate used in calculating Idaho state tax for year 2018

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 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 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 = >$4,050< 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
    $ >2,300
    $    0.00
    plus
    0.0%
    $        0
       2,300
       3,772
          0.00
    plus
    1.6%
       >2,300
       3,772
       5,245
         24.00
    plus
    3.6%
        3,772
       5,245
       6,717
         77.00
    plus
    4.1%
        5,245
       6,717
       8,190
       137.00
    plus
    5.1%
        6,717
       8,190
       9,662
       212.00
    plus
    6.1%
        8,190
       9,662
      13,434
       302.00
    plus
    7.1%
        9,662
      13,434
      and over
       563.00
    plus
    7.4%
      13,434


    Married

    If the Amount of
    Taxable Income Is:

    The Amount of Idaho
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $        0
    $  >8,650
    $      0.00
    plus
    0.0%
    $        0
        8,650
         11,594
            0.00
    plus
    1.6%
      >8,650
        11,594
       14,540
          47.00
    plus
    3.6%
        11,594
      14,540
       17,484
        153.00
    plus
    4.1%
      14,540
      17,484
       20,430
        274.00
    plus
    5.1%
      17,484
      20,430
       23,374
        424.00
    plus
    6.1%
      20,430
      23,374
       30,736
        604.00
    plus
    7.1%
      23,374
      30,736
       and over
        1127.00
    plus
    7.4%
      30,736

  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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