Indiana State Income Tax Withholding Information

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 Resources:

TAXES 15-03, Indiana State Income Tax Withholding

Withholding Formula (Effective Pay Period 01, 2015)

  1. Subtract the biweekly Thrift Savings Plan contribution from the gross biweekly wages.
  2. Subtract the nontaxable biweekly Federal Health Benefits Plan payment(s) (includes dental and vision insurance program, and 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 result of step 4.

    Exemption Allowance = $1,000 x Number of Exemptions1
    1 Number of exemptions claimed for self, spouse, over age 65, blindness, and dependents.
  6. Determine the additional allowance by applying the following guideline and subtract this amount from step 5 to compute the taxable income.

    Additional Allowance = $1,500 x Number of Additional Exemptions2
    2 Number of exemptions claimed for certain qualifying dependents.
  7. Multiply the taxable income computed in step 6 by 3.3 percent to obtain the annual Indiana tax withholding.
  8. Divide the annual Indiana tax withholding by 26 to obtain the biweekly Indiana tax withholding.