Iowa Standard Deduction
The Iowa standard deduction is a flat amount you can subtract from your gross income before Iowa income tax is calculated, instead of itemising individual deductions. This page shows the Iowa standard deduction for tax year 2025 by filing status, sourced directly from the Iowa Department of Revenue, and calculates your Iowa taxable income after the deduction. Enter your gross income and choose your filing status to see the deduction that applies and the taxable income that remains. Most filers take the standard deduction because it is simpler and, for many, larger than their itemisable deductions. You should itemise only if your allowable Iowa itemised deductions add up to more than the standard amount. The standard deduction is separate from the federal standard deduction the IRS applies to your federal return, and from any personal exemptions or credits Iowa provides. Use this alongside the Iowa income tax calculator to see how the deduction flows through to your final state tax. All figures here are the official published amounts; nothing is estimated.
The Iowa standard deduction for 2025 is $14,600.00 (single) and $29,200.00 (married filing jointly). On $60,000.00 of gross income, a single filer has $45,400.00 of Iowa taxable income.
Iowa standard deduction by filing status (2025)
| Filing status | Standard deduction | Source |
|---|---|---|
| Single | $14,600.00 | Iowa Department of Revenue |
| Married filing jointly | $29,200.00 | Iowa Department of Revenue |
| Head of household | $21,900.00 | Iowa Department of Revenue |
| Married filing separately | $14,600.00 | Iowa Department of Revenue |
Iowa conforms to the federal standard deduction for tax year 2025. Amounts shown are the 2024 federal standard deduction figures as carried into the Iowa return; 2025 figures are adjusted annually for inflation and should be confirmed with the Iowa Department of Revenue at the start of the filing season.
Formula
taxable income = max(0, gross income - standard deduction for your filing status)
Iowa standard deduction: frequently asked questions
What is the Iowa standard deduction for 2025?
For tax year 2025, the Iowa standard deduction is $14,600.00 for single filers and $29,200.00 for married couples filing jointly, as published by the Iowa Department of Revenue. It is subtracted from your gross income to give your Iowa taxable income.
How does the Iowa standard deduction affect my tax?
The standard deduction lowers your Iowa taxable income, which is the figure the state income tax brackets are applied to. A single filer with $60,000.00 of gross income and the $14,600.00 standard deduction has $45,400.00 of Iowa taxable income before any other adjustments.
Should I take the Iowa standard deduction or itemise?
Take whichever is larger. If your total itemised deductions allowed by Iowa exceed the standard deduction of $14,600.00 (single) or $29,200.00 (married jointly), itemising lowers your taxable income more. Otherwise the standard deduction is simpler and larger. Check the rules with the Iowa Department of Revenue.
What is Iowa's income tax rate for 2025?
Iowa imposes a flat income tax rate of 3.9% on all taxable income for tax year 2025. The rate applies to every dollar of taxable income regardless of how much you earn or how you file.
What happened to Iowa's old graduated income tax brackets?
Iowa previously used a graduated system with up to nine brackets and a top rate of 8.98%. Senate File 2342, signed in 2022, set out a multi-year phase-down of those brackets. Each year the rates and thresholds were compressed until, on January 1, 2025, the final transition to a single flat rate of 3.9% was complete.
When did Iowa's flat income tax take effect?
The flat 3.9% rate took effect for tax years beginning on or after January 1, 2025. For tax year 2024, Iowa used a transitional schedule with a reduced number of brackets and lower rates than prior years, but the fully flat structure only applies from 2025 onward.
What standard deduction can Iowa filers claim?
Iowa conforms to the federal standard deduction. For tax year 2025, filers use the same standard deduction amounts set by the IRS: $14,600 for single filers, $29,200 for married filing jointly, $21,900 for head of household, and $14,600 for married filing separately. These amounts are indexed annually for inflation.
Official sources
- Iowa standard deduction (tax year 2025): Iowa Department of Revenue, as at Jun 12, 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. General information, not financial or tax advice.