How Iowa taxes your income
Iowa has a flat 3.8% state income tax for 2026. The Iowa income tax calculator above shows federal and state income tax separately, with your effective and marginal rates.
- Standard deduction: $16,100 (single) or $32,200 (married filing jointly).
- Personal credit (subtracted from tax): $40 (single) or $80 (married filing jointly).
- Pre-tax 401(k) contributions reduce your Iowa taxable wages.
Iowa tax rate
Iowa applies one rate of 3.8% to all taxable income.
What this calculator includes
It uses 2026 federal income tax brackets for single filers and married couples filing jointly, Social Security and Medicare tax, and the Iowa rules above. It does not include dependents, tax credits other than those listed, itemized deductions, self-employment tax, or head of household filing.
Some Iowa school districts add a surtax that is not included.
Rates, brackets and deductions as published for tax year 2026 (state data sourced February 2026).
Frequently asked questions
What is the state income tax rate in Iowa?
Iowa uses a flat rate of 3.8% on taxable income for 2026. Taxable income is your wages after the deductions and exemptions listed on this page.
What deductions does Iowa allow in this calculator?
Iowa has a standard deduction of $16,100 (single) or $32,200 (married filing jointly), a personal credit of $40 (single) or $80 (married filing jointly). These are the only Iowa deductions and credits the calculator uses. Itemized deductions and dependents are not included.
Do 401(k) contributions lower my Iowa income tax?
Yes. Pre-tax 401(k) contributions are taken out of your Iowa taxable wages as well as your federal taxable wages. They do not reduce Social Security or Medicare tax.
Which federal taxes apply to my pay in Iowa?
Federal income tax uses 2026 brackets from 10% to 37% after the $16,100 standard deduction for single filers. Social Security is 6.2% on wages up to $184,500 and Medicare is 1.45% on all wages, with 0.9% extra above $200,000 ($250,000 for joint filers).
Does this calculator include local taxes?
Some Iowa school districts add a surtax that is not included. Other local payroll taxes, such as transit levies, are also not included.
Are Social Security and Medicare included?
No. This page shows income tax only. Use the Iowa salary calculator to see take-home pay after Social Security and Medicare as well.
How current is the Iowa data?
Rates, brackets and deductions as published for tax year 2026 (state data sourced February 2026). Tax laws change, so confirm important numbers with the official sources listed below.
Official and data sources
- Iowa – state tax agency
- IRS – Federal income tax rates and brackets
- Social Security Administration – Contribution and benefit base
- Tax Foundation – State Individual Income Tax Rates and Brackets, 2026
← Back to the main Income Tax Calculator
Also for Iowa: Iowa Salary Calculator · Iowa Paycheck Calculator
Disclaimer: results are estimates for information only. They are not tax, legal or financial advice.