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How to Calculate 2018 South Carolina 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 South Carolina 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 South Carolina small businesses here.
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South Carolina State Tax Tables

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

Tax rate used in calculating South Carolina state tax for year 2018

State Abbreviation:

SC

State Tax Withholding State Code:

45

Acceptable Exemption Form:

WH 1602

Basis For Withholding:

State Exemptions

Acceptable Exemption Data:

0 / Number of 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.

Additional Information:

None

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

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

  3. Determine the standard deduction by applying the following guideline and subtract this amount from the annual wages.

    4. If The Number of Exemptions
    Claimed    1 Is:

    Subtract This Amount2:

    1 or more
    10% of annual wages or $3,150
    1 Use annual wages when no exemptions are claimed.
    2 Use the lesser amount.

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

    5. Exemption Allowance = $2,440 x Number of Exemptions

  5. Apply the taxable income computed in step 4 to the following table to obtain the South Carolina tax withholding.

    6. Tax Withholding Table

    If the Amount of
    Taxable Income Is:

    The Amount of South Carolina
    Tax Withholding Should Be:


    Over:

    But Not
    Over:

    Of Excess
    Over:

    $        0
    $  2,290
    $   0
    plus
    1.4%
    $         0
        2,290
        4,580
       32.06
    plus
    3%
        2,290
        4,580
        6,870
     100.76
    plus
    4%
        4,580
        6,870
        9,160
     192.36
    plus
    5%
        6,870
        9,160
      11,450
     306.86
    plus
    6%
        9,160
      11,450
      and over
     444.26
    plus
    7%
      11,450


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

More Payroll Information for South Carolina Small Business

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