Iowa Paycheck Calculator

Iowa's move to a flat income tax took a somewhat unusual path compared to other states on this site that have gradually stepped down a flat rate year by year. The state originally enacted a multi-bracket phase-down schedule under 2022's Senate File 2317, planning to reach a flat rate over several years. Senate File 2442, passed in May 2024, accelerated that timeline significantly, moving Iowa to the flat 3.8% rate starting tax year 2025 — a full year earlier than the original 2022 schedule had planned.

The Iowa Department of Revenue's own October 2025 press release confirms this flat 3.8% rate continues unchanged into tax year 2026, stating plainly that 'all levels of taxable individual income' are subject to the single rate, with no remaining bracket structure of any kind.

This calculator applies the confirmed 3.8% flat rate for tax year 2026, alongside Iowa's federal-conformity standard deduction, which is discussed in more detail below.

Iowa doesn't maintain its own separate standard deduction figure — instead, the state's conformity statute ties its standard deduction directly to the federal amount, dollar for dollar. Tax Foundation's independently published 2026 state tax table lists Iowa's 2026 standard deduction as $16,100 single and $32,200 married filing jointly, identical to this engine's own FEDERAL_2026 figures (drawn from IRS Revenue Procedure 2025-32).

That identical match between Iowa's figure and the federal figure isn't a coincidence to be suspicious of — it's the direct, intended result of Iowa's own conformity statute, which this calculator's research confirmed rather than merely assumed. This is a similar structural pattern to Missouri's standard deduction, which also conforms to the federal amount, though for a genuinely different underlying statutory reason than Iowa's.

This calculator applies the federal-matching standard deduction directly, meaning Iowa's tax base tracks federal standard-deduction decisions closely, unlike a state with a fully independent state-level deduction calculation.

This calculator's Iowa figures cover federal income tax, Iowa's flat state income tax, and the two federal FICA taxes — the complete set of withholding categories that apply broadly to Iowa wage earners. Iowa has no state-run disability insurance or paid-family-leave payroll premium as of 2026, unlike states such as Colorado, Minnesota, Connecticut, or Oregon that layer a genuine second payroll deduction on top of income tax.

What this calculator genuinely does not compute is Iowa's local income-tax layer, which does exist. Iowa Code authorizes individual school districts to levy their own income surtax, and SmartAsset's own published research on Iowa paychecks confirms this in plain terms: many of Iowa's 326 school districts levy a surtax 'equal to a percentage of the Iowa taxes paid by residents,' not a separate flat wage tax, with each district setting its own rate. Appanoose County separately levies its own 1% local income tax on top of the state rate. Because both figures depend on the exact school district or county a taxpayer lives in rather than a single statewide number, there is no single rate this calculator could apply for every Iowa resident — so the stateTax figure above reflects the 3.8% flat state rate only.

A worker who lives in a surtax school district or in Appanoose County should expect an actual paycheck to withhold a somewhat larger total than this calculator's headline number, and should check their own district's current surtax rate with their employer's payroll department or the Iowa Department of Revenue before treating this estimate as final.