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    How to Calculate 2018 Indiana 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 Indiana 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 downloadezPaycheck 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 computer icon in house payroll tax solution for Indiana small businesses here.
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    Indiana State Tax Tables




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    2026 Indiana State Tax Witholding Table
    2025 Indiana State Tax Witholding Table
    2024 Indiana State Tax Witholding Table
    2023 Indiana State Tax Witholding Table
    2022 Indiana State Tax Witholding Table
    (2021  2020  2019  2018  2017  )

    Tax rate used in calculating Indiana state tax for year 2018

    State Abbreviation:

    IN

    State Tax Withholding State Code:

    18

    Acceptable Exemption Form:

    WH-4

    Basis For Withholding:

    State Exemptions

    Acceptable Exemption Data:

    0/ Number of Exemptions/ Number of Additional Exemptions

    TSP Deferred:

    Yes

    Special Coding:

    Determine the Total Number Of Allowances field as follows:
    First Position - Enter 0 (zero).
    Second and Third Positions- Enter the number of exemptions claimed.

    Determine the Additional Exemptions Claimed field as follows:
    First and Second Positions- Enter the number of additional exemptions claimed on Line 5 of the WH-4. Valid values are 00 through 99. If no allowances are claimed, enter 00.

    Additional Information:

    None


    Withholding Formula (Indiana Effective 2018)
    1. Subtract the biweekly Thrift Savings Plan contribution from the gross biweekly wages.

    2. Multiply the adjusted gross biweekly wages times 26 to obtain the annual wages.

    3. Determine the exemption allowance by applying the following guideline and subtract this amount from the result of step 2.

      4. Exemption Allowance = $1,000 x Number of Exemptions1

      1 Number of exemptions claimed for self, spouse, over age 65, blindness, and dependents.

    4. Determine the additional allowance by applying the following guideline and subtract this amount from the result of step 3 to compute the taxable income:

      5. Additional Allowance = $1,500 x Number of Additional Exemptions2

      2 Number of exemptions claimed for certain qualifying dependents.

    5. Multiply the taxable income computed in step 4 by 3.23 percent to obtain the annual Indiana tax withholding.

    6. Divide the annual Indiana tax withholding by 26 to obtain the biweekly Indiana tax withholding.

    2018 Indiana County Income Tax Rates and County Code

    County NameCounty CodeTax TypeRate
    Adams01COIT/CEDIT0.01624
    Allen02COIT/CEDIT0.0148
    Bartholomew03CAGIT/CEDIT0.0125
    Benton04CAGIT/CEDIT0.0179
    Blackford05CAGIT/CEDIT0.015
    Boone06COIT0.015
    Brown07CAGIT/CEDIT0.025234
    Carroll08CAGIT/CEDIT0.017039
    Cass09CAGIT/CEDIT0.025
    Clark10CAGIT/CEDIT0.02
    Clay11CAGIT0.0225
    Clinton12CAGIT/CEDIT0.0225
    Crawford13CAGIT/CEDIT0.01
    Daviess14CAGIT/CEDIT0.0175
    Dearborn15COIT0.006
    Decatur16CAGIT/CEDIT0.0133
    DeKalb17CAGIT/CEDIT0.02
    Delaware18COIT/CEDIT0.015
    Dubois19COIT/CEDIT0.01
    Elkhart20CAGIT/CEDIT0.02
    Fayette21COIT/CEDIT0.0237
    Floyd22CAGIT/CEDIT0.0115
    Fountain23CAGIT/CEDIT0.021
    Franklin24CAGIT/CEDIT0.015
    Fulton25CAGIT/CEDIT0.0193
    Gibson26CEDIT0.007
    Grant27COIT/CEDIT0.0225
    Greene28COIT0.0125
    Hamilton29COIT0.01
    Hancock30CAGIT/CEDIT0.017
    Harrison31CAGIT/CEDIT0.01
    Hendricks32CAGIT/CEDIT0.015
    Henry33COIT/CEDIT0.015
    Howard34COIT/CEDIT0.0165
    Huntington35CAGIT/CEDIT0.0175
    Jackson36CAGIT/CEDIT0.021
    Jasper37CAGIT/CEDIT0.02864
    Jay38CAGIT/CEDIT0.0245
    Jefferson39CEDIT0.0035
    Jennings40CAGIT/CEDIT0.025
    Johnson41CAGIT0.01
    Knox42COIT/CEDIT0.01
    Kosciusko43COIT/CEDIT0.01
    LaGrange44CAGIT/CEDIT0.0165
    Lake45CAGIT/CEDIT0.015
    LaPorte46CAGIT/CEDIT0.0095
    Lawrence47CAGIT0.0175
    *Madison48COIT/CEDIT0.0175
    Marion49COIT0.0202
    Marshall50CAGIT0.0125
    Martin51COIT/CEDIT0.015
    Miami52COIT/CEDIT0.0254
    Monroe53COIT0.01345
    Montgomery54COIT/CEDIT0.021
    Morgan55CAGIT/CEDIT0.0272
    Newton56CAGIT0.01
    Noble57CAGIT/CEDIT0.0175
    Ohio58CAGIT0.0125
    Orange59CAGIT/CEDIT0.0125
    Owen60CAGIT/CEDIT0.013
    Parke61CAGIT/CEDIT0.0265
    Perry62COIT/CEDIT0.0181
    Pike63CEDIT0.0075
    Porter64CEDIT0.005
    Posey65COIT/CEDIT0.0125
    Pulaski66CAGIT/CEDIT0.0338
    Putnam67CAGIT/CEDIT0.0175
    Randolph68CAGIT/CEDIT0.0225
    Ripley69CAGIT/CEDIT0.0138
    Rush70CAGIT/CEDIT0.021
    St. Joseph71COIT/CEDIT0.0175
    Scott72COIT/CEDIT0.0141
    Shelby73CAGIT/CEDIT0.015
    Spencer74COIT/CEDIT0.008
    Starke75CAGIT/CEDIT0.0171
    Steuben76CAGIT/CEDIT0.0179
    Sullivan77CEDIT0.006
    Switzerland78COIT0.01
    Tippecanoe79COIT/CEDIT0.011
    Tipton80CAGIT/CEDIT0.026
    Union81CAGIT/CEDIT0.0175
    Vanderburgh82COIT0.01
    Vermillion83CEDIT0.015
    Vigo84CAGIT/CEDIT0.0125
    Wabash85CAGIT/CEDIT0.029
    Warren86CAGIT/CEDIT0.0212
    Warrick87CEDIT0.005
    Washington88CAGIT/CEDIT0.02
    Wayne89CAGIT/CEDIT0.015
    Wells90CAGIT/CEDIT0.021
    White91CAGIT/CEDIT0.0132
    Whitley92CAGIT/CEDIT0.014829

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