2026 official-source estimate
Iowa Paycheck Calculator
Estimate Iowa withholding with the official 2026 four-step formula and the current IA W-4 allowance amount.
Your paycheck details
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Replace them with your own paycheck information. WageFrame did not read or save personal wage data.
Pay classification
Work locations and home state
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Federal withholding profile
Federal W-4 adjustments
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Year-to-date wages and other deductions
Included
What this estimate covers
- Federal income tax withholding
- Social Security and Medicare
- 2026 Iowa 3.8% withholding formula
- 2026 IA W-4 filing status and total annual allowance amount
- IA W-4 additional withholding and valid annual exemption
Limitations
What is not included
- School district surtax, which has no separate employer formula in the IA W-4
- Interstate wage allocation and special nonresident exemptions
- Supplemental-wage flat-rate treatment
- Unentered employer benefits and unsupported deduction treatments
How the Iowa estimate works
Enter gross pay for one pay period, federal W-4 adjustments, and the state details shown above. Federal withholding follows Publication 15-T. Iowa subtracts the 2026 pay-period deduction for the filing selection, applies 3.8%, subtracts the pay-period share of the total annual allowance amount on IA W-4 Line 7, and adds the employee’s Line 8 amount. The result cannot be negative.
Example: The official 2026 example uses $2,100 of biweekly wages, the ‘Other’ filing selection, and $40 of total annual allowances. The four-step formula produces $59.26 of Iowa withholding. The calculator does not assume any unentered benefit deduction or invent a tax result.
Weekly, biweekly, semimonthly, and monthly are the supported paycheck frequencies. “Annual salary” is an earnings input and the annual view is a simple period multiplication; neither is an annual payroll-period method. The special Form W-4 adjustment for nonresident aliens is not modeled.
Source trail
Official data used on this page
Each rule is versioned and reviewed before production use.
See every checksum and effective date on the tax data sources page.