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How to Calculate 2017 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 2017 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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2018 Idaho State Tax Witholding Table
2017 Idaho State Tax Witholding Table
2016 Idaho State Tax Witholding Table
2015 Idaho State Tax Witholding Table
2014 Idaho State Tax Witholding Table
2013 Idaho State Tax Witholding Table
2012 Idaho State Tax Witholding Table
2011 Idaho State Tax Witholding Table
2010 Idaho State Tax Witholding Table


IRS released the new 2018 tax tables on Jan 11, 2018. Employers should implement the 2018 withholding tables as soon as possible, but not later than February 15, 2018.

Current ezPaycheck software clients and ezAccounting software clients can download the latest version for free to update 2018 tax tables.

Tax rate used in calculating Idaho state tax for year 2017

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 2017)<
  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

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

  8. 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
    $ >2,250
    $    0.00
    plus
    0.0%
    $        0
       2,250
       3,704
          0.00
    plus
    1.6%
       >2,250
       3,704
       5,158
         23.00
    plus
    3.6%
        3,704
       5,158
       6,612
         75.00
    plus
    4.1%
        5,158
       6,612
       8,066
       135.00
    plus
    5.1%
        6,612
       8,066
       9,520
       209.00
    plus
    6.1%
        8,066
       9,520
      13,155
       298.00
    plus
    7.1%
        9,520
      13,155
      and over
       556.00
    plus
    7.4%
      13,155


    Married

    If the Amount of
    Taxable Income Is:

    The Amount of Idaho
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $        0
    $  >8,550
    $      0.00
    plus
    0.0%
    $        0
        8,550
         11,458
            0.00
    plus
    1.6%
      >8,550
        11,458
       14,366
          47.00
    plus
    3.6%
        11,458
      14,366
       17,274
        152.00
    plus
    4.1%
      14,366
      17,274
       20,182
        272.00
    plus
    5.1%
      17,274
      20,182
       23,090
        419.00
    plus
    6.1%
      20,182
      23,090
       30,360
        596.00
    plus
    7.1%
      23,090
      30,360
       and over
        1112.00
    plus
    7.4%
      30,360

  9. 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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