DollarWise

Free Iowa Income Tax Calculator 2026 — Estimate Your IA Tax

October 18, 2026 · 3 min read · By the DollarWise team

Enter your income, filing status, and deductions, and this calculator applies Iowa’s real 2026 flat rate of 3.8% on Iowa taxable income — plus the retirement-income exclusion for eligible residents — to estimate your state tax, effective rate, and take-home pay. It runs entirely in your browser — your income is never typed into anyone’s server. Educational estimate only; it excludes federal tax, other credits, and local taxes.

Iowa Income Tax Calculator (2026)

Estimate your 2026 Iowa tax in seconds — real flat 3.8% rate, retirement-income exclusion, effective rate, and take-home pay.

100% Free Forever No Sign-up No Credit Card Private — files never leave your browser Unlimited Use

1 Your 2026 income

Filing status
Gross annual income ($)
Pre-tax deductions — 401(k), HSA etc. ($)
Retirement income — pension, IRA, 401(k) ($)
Your Iowa deductions — standard or itemized ($)
Since 2023, Iowa excludes retirement income — pensions, IRA/401(k) distributions, annuities, military retirement — for residents 55 or older, disabled residents, and qualifying surviving spouses. Social Security is not taxed by Iowa at all. Uses the flat 3.8% rate on Iowa taxable income (flat since 2025, unchanged for 2026). Educational estimate, not tax advice.

2 Your estimate

🧾 2026 Iowa estimate

🎉 Free forever. No sign-up. No credit card. No limits.

Estimate your 2026 Iowa tax — free forever, right in your browser.

How it works

The calculator subtracts your pre-tax deductions (401(k), HSA), your Iowa deductions (your state standard deduction or itemized amount), and — if you mark yourself eligible — your retirement income, from gross income to get Iowa taxable income. Then it applies the flat 3.8% rate: every taxable dollar is taxed identically, with no brackets to climb. Iowa moved to this flat rate in 2025 after a multi-year phase-down from a top rate of 8.53% in 2022, and it is unchanged for 2026.

Everyday uses

  • Iowa workers — estimate your state withholding and check for an April surprise.
  • New residents — see what the move costs you under Iowa’s flat tax before you relocate.
  • Retirees 55+ — model the retirement-income exclusion: mark yourself eligible and enter your pension/IRA/401(k) income to see how close to zero your Iowa bill gets.
  • Freelancers — rough out quarterly Iowa estimated payments.
  • Job changers — compare offers by real take-home, not headline salary.

Frequently asked questions

Is Iowa really a flat-tax state now? Yes. Iowa transitioned to a flat 3.8% individual income tax starting in 2025 (Iowa Code § 422.5), and the rate is unchanged for 2026. There are no brackets — your marginal rate and your average rate are the same.

What is the retirement-income exclusion? Since 2023, Iowa excludes retirement income — pensions, IRA and 401(k) distributions, annuities, and military retirement — for residents who are 55 or older, disabled, or qualifying surviving spouses. Social Security is not taxed by Iowa for anyone.

Does Iowa have a standard deduction? Iowa sets its own modest state standard deduction (separate from the federal one). Because it changes with state law, this calculator lets you enter your own deduction amount rather than hard-coding a figure — use your Iowa standard deduction or your itemized total, whichever is larger.