Iowa Income Tax Calculator
Iowa taxes income at a flat 3.8% in the 2026 simplified model, applied after the $16,100 single standard deduction. This page presets Iowa in the paycheck calculator, so the federal tax, FICA and pay-frequency maths are identical to the main Paycheck Calculator — only the state estimate changes. The state model is simplified (Tax Foundation 2026 single-filer brackets and standard deduction only): local income taxes, personal exemptions, credits and phase-outs are not included.
Iowa Income Tax Calculator reference last updated · reference source
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Currency: Amounts are calculated in the currency you select; this site does not convert between currencies and does not use live exchange rates.
Dated static reference; no live data is fetched. Verify current source values and assumptions before relying on results.
What this tool does
Iowa taxes income at a flat 3.8% in the 2026 simplified model, applied after the $16,100 single standard deduction. This page presets Iowa in the paycheck calculator, so the federal tax, FICA and pay-frequency maths are identical to the main Paycheck Calculator — only the state estimate changes. The state model is simplified (Tax Foundation 2026 single-filer brackets and standard deduction only): local income taxes, personal exemptions, credits and phase-outs are not included.
How to use the Iowa Income Tax Calculator
- Check State (estimate): IA.
- Review the Iowa Income Tax Calculator result and its exact-value comparison table.
- Verify assumptions before applying the result.
Formula
annual federal tax = brackets(max(0, salary − pre-tax − standard deduction)); FICA = 6.2% × min(salary, $184,500) + 1.45% × salary (+0.9% above the threshold); per-paycheck amounts = annual amounts ÷ pay periods
- salary
- Gross annual pay before any tax
- pre-tax
- 401(k), HSA and similar deductions — they reduce federal and state taxable wages here; FICA is still computed on gross wages
- pay periods
- 52 weekly, 26 biweekly, 24 semimonthly, 12 monthly
Biweekly (26) and semimonthly (24) are not the same: two months a year have a third biweekly paycheck.
Worked example
Iowa Income Tax Calculator: State (estimate) = IA. Iowa taxes income at a flat 3.8% in the 2026 simplified model, applied after the $16,100 single standard deduction. This page presets Iowa in the paycheck calculator, so the federal tax, FICA and pay-frequency maths are identical to the main Paycheck Calculator — only the state estimate changes. The state model is simplified (Tax Foundation 2026 single-filer brackets and standard deduction only): local income taxes, personal exemptions, credits and phase-outs are not included.
Inputs
- Annual gross salary85000
- Pay frequencyEvery two weeks — 26 paychecks
- Filing statusSingle
- State (estimate)Iowa
- Pre-tax deductions per year (401(k), HSA, premiums)0
Result
- Net pay per paycheck$2,538.82
- Gross pay per paycheck$3,269.23
- Federal income tax per paycheck$379.62
- Social Security per paycheck$202.69
- Medicare per paycheck$47.40
- State tax per paycheck (estimate)$100.70
- Effective total tax rate22.34%
- Annual net pay$66,009.30
Iowa income tax model used (2026, single filer, simplified)
| Item | Value |
|---|---|
| Structure | Flat 3.8% |
| Top rate | 3.8% |
| Standard deduction (single) | $16,100 |
Results explained
- Net pay per paycheck
- Gross per period minus federal, FICA and state tax per period, after pre-tax deductions.
- Federal income tax per paycheck
- Annual bracket tax on salary minus pre-tax deductions and the standard deduction, divided by pay periods.
- Social Security per paycheck
- 6.2% of gross wages, stopping for the year once wages pass $184,500.
- Medicare per paycheck
- 1.45% of gross wages plus any 0.9% Additional Medicare Tax, spread over the year.
- State tax per paycheck (estimate)
- Simplified state model: state brackets and standard deduction only.
Frequently asked questions
Iowa taxes income at a flat 3.8% in the 2026 simplified model, applied after the $16,100 single standard deduction.
In the simplified model used here, Iowa's single-filer standard deduction is $16,100. Personal exemptions and credits are not modelled.
Your annual salary (minus pre-tax deductions) is reduced by the Iowa standard deduction in the model, the result runs through the state's rate, and the annual figure is divided by your pay frequency alongside federal tax and FICA.
No. Some Iowa localities levy their own income taxes, and this simplified state model excludes them, along with exemptions, credits and benefit recapture rules. Use it for planning, not for filing.
Employers withhold from state percentage-method tables and your state withholding form, and they round per pay period. This tool taxes the full year once with the simplified model and divides evenly, so small per-paycheck differences are expected.