Iowa State Income Tax Withholding Information
State Abbreviation: |
IA |
State Tax Withholding State Code: |
19 |
Acceptable Exemption Form: |
IA-W4 or W-4 |
Basis For Withholding: |
State Exemptions |
Acceptable Exemption Data: |
0 / Number of Allowances |
TSP Deferred: |
Yes |
Special Coding: |
Determine the Total Number Of Allowances Claimed field as follows: First Position - Enter 0 (zero). Second and Third Positions - Enter the number of allowances claimed. |
Additional Information: |
None |
Additional Resources: |
Withholding Formula (Effective Pay Period 13, 2006)
- Subtract the biweekly Thrift Savings Plan contribution from the gross biweekly wages.
- 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.
- Add the taxable biweekly fringe benefits (taxable life insurance, etc.) to the amount computed in step 2 to obtain the adjusted gross biweekly wages.
- Multiply the adjusted gross biweekly wages times 26 to obtain the gross annual wages.
- Multiply the biweekly Federal income tax withholding by 26 to obtain the annual Federal income tax withholding and subtract this amount from the gross annual wages computed in step 4.
- Determine the standard deduction by applying the following guideline and subtract this amount from the result of step 5 to compute the taxable income.
If the Number of Allowances Claimed Is:
The Standard Deduction Is:
0 or 1
$
1,650
2 or more
4,060
- Apply the taxable income computed in step 6 to the following table to determine the Iowa tax withholding.
Tax Withholding Table
If the Amount of
Taxable Income Is:The Amount of Iowa
Tax Withholding Should Be:Over:
But Not
Over:Of Excess
Over:$0
$1,300
$0.00
plus
0.36%
$0
1,300
2,600
4.68
plus
0.72%
1,300
2,600
5,200
14.04
plus
2.43%
2,600
5,200
11,700
77.22
plus
4.50%
5,200
11,700
19,500
369.72
plus
6.12%
11,700
19,500
26,000
847.08
plus
6.48%
19,500
26,000
39,000
1,268.28
plus
6.80%
26,000
39,000
58,500
2,152.28
plus
7.92%
39,000
58,500
and over
3,696.68
plus
8.98%
58,500
- Determine the exemption allowance by applying the following guideline and subtract this amount from the result of step 7 to compute the annual Iowa tax withholding
- Divide the annual Iowa tax withholding by 26 and round to the nearest dollar to obtain the biweekly Iowa tax withholding.
Exemption Allowance = $40 x Number of Exemptions