Iowa State Income Tax Guide (2026)

Iowa's HF 2317 (signed June 2022) is one of the most aggressive state tax overhauls in modern US history, on par with North Carolina's 2013 reform but moved faster. The schedule: 8.53% top with 9 brackets in 2022; 6% top with 4 brackets in 2023; 5.7% top with 3 brackets in 2024; 4.82% top with 2 brackets in 2025; then flat 3.8% from 2026 forward. The 2024 acceleration legislation locked the final 2026 rate at 3.8% rather than 3.9%, saving Iowans an additional ~0.1 percentage point of income tax compared to the original schedule.

A $90K Des Moines insurance professional in 2022 paid about $4,600 in state income tax under the 9-bracket schedule. The same person in 2026 pays about $3,420 — a $1,180/year reduction, indefinitely. Across the Iowa workforce, the cumulative savings runs into billions of dollars per year that previously flowed to the state's General Fund.

Iowa starts with federal taxable income and applies state-specific adjustments. There is no separate Iowa standard deduction — the federal $16,100 single / $32,200 MFJ flows through. The most important state-specific adjustment is the 2023 retirement income exclusion: taxpayers 55 or older get a full exemption on pensions, IRA distributions, 401(k) distributions, and other qualified retirement income. Social Security is exempt at all ages.

Iowa has reciprocity with Illinois only — IA residents working in IL (and vice versa) owe tax only to their state of residence. This is essential to Quad Cities cross-river commuters and pockets of border activity. The neighboring states (MN, WI, MO, NE, SD) have no reciprocity with Iowa — cross-border workers from those states file two state returns and use the credit-for-tax-paid-to-other-state mechanism to avoid double-taxation.

The Quad Cities — Davenport and Bettendorf on the Iowa side of the Mississippi, Moline and Rock Island on the Illinois side — is one of the few US metros where reciprocity is a daily fact of life. Thousands of John Deere, Arconic, and regional healthcare workers cross the Government Bridge or I-74 bridge to work each morning. The mechanics are clean: IA residents working in IL file Form IL-W-5-NR with their IL employer; IL stops withholding state tax; IA collects the 3.8% on those wages on the regular IA resident return. IL residents working in IA file the equivalent IA-44-016 with their IA employer; IA stops withholding; IL collects its 4.95% flat on those wages.

The arbitrage runs in IA's favor since 2026. IA residents working in IL save 1.15 percentage points of state tax (3.8% IA vs 4.95% IL) — about $700/year on $60K of IL wages, $1,200/year on $100K. IL residents working in IA actually pay slightly more (4.95% IL vs IA's 3.8% they would have paid as residents) — but they still benefit from IL property tax being roughly comparable to IA and IL's general absence of school-finance-driven mill rate variability.

For retirees, the 55+ income exclusion is the structural advantage that doesn't get enough attention. A 62-year-old Iowa retiree drawing $50K from a 401(k) + $30K Social Security + $20K of part-time wages: state income tax is 3.8% applied only to the $20K of wages = $760/year. The full $50K of 401(k) distribution and $30K of SS are exempt. Compare to Minnesota at the same retirement income mix: ~$5,000 state tax. Wisconsin: ~$3,200. Illinois (which fully exempts retirement income): $0. Iowa beats every neighbor except IL for retirees once both the 55+ exclusion and the lower flat rate are in play.

Four scenarios that cover most readers. Find the one closest to you. If none match, the calculator at the top is for you.

Iowa property tax statewide effective average is about 1.50% on market value — among the higher Midwest rates and well above the national average of ~1.10%. The structural reason is school finance: Iowa funds K-12 primarily through local property tax (one of the highest local-school-funding shares in the country), so the residential mill rate is doing real fiscal work that other states cover via state-level sales or income tax.

Approximate effective rates by county on a primary residence: Polk (Des Moines) 1.45-1.65%, Linn (Cedar Rapids) 1.50-1.70%, Johnson (Iowa City) 1.50-1.65%, Scott (Davenport) 1.55-1.75%, Black Hawk (Waterloo) 1.60-1.80%, Dubuque 1.45-1.65%, Story (Ames) 1.40-1.60%, Pottawattamie (Council Bluffs) 1.45-1.65%, Woodbury (Sioux City) 1.55-1.75%.

Iowa applies a residential rollback factor (~54% for assessment year 2026) that reduces the assessed value before the local mill applies. So the published nominal mill levy isn't what hits your bill. The math: a $300K home → $162K rolled-back taxable value → local mill (~3.0% nominal) → ~$4,860/year in property tax. The rollback is the structural mechanism Iowa uses to keep effective rates from being even higher. It applies automatically; you don't claim it.

On top of the annual mill, Iowa has no real estate transfer tax (one of the simpler closing-cost structures in the country). The OBBBA SALT cap raise to $25K softens the deductibility hit on the annual property tax bill for high earners but doesn't change the cash bill.

If you're earning $100K+ in IA and you're not doing most of these, you may be leaving real money on the table. None of this is exotic. Most of it is 30 minutes of setup once a year and discipline the rest of the year.

Iowa post-HF-2317 is genuinely transformed. The flat 3.8% income tax (2026), full retirement income exclusion for 55+, Social Security exemption at all ages, and no state estate tax add up to a quietly excellent tax setup — especially for retirees. The offset is property tax — appreciably above national average, partly driven by Iowa's school-finance structure. Net total state-and-local tax burden for typical professionals lands in the moderate-to-low range; for retirees 55+, it lands at one of the lowest combined burdens in the Midwest.

Run your numbers in the calculator above. If you're 55 or older, confirm your pension, IRA, and 401(k) distributions are being treated as exempt under HF 2317 — the calculator handles this if filing age is set correctly.

If you live near the IL border and work across, file the IL-IA reciprocity certificate with your employer (IL-W-5-NR if you're an IA resident working in IL, IA-44-016 if reverse). Skipping it means double-withholding and a credit reconciliation at filing time.

Property tax is the bigger lever than income tax for most Iowans. Verify your county's residential rollback factor and the published mill levy. Appeal an assessment increase if it crosses a meaningful threshold. If you're under-saving in retirement accounts, fix that this month before any other tax move — the federal benefit plus IA's 3.8% combined savings runs $6,000+/year on a maxed 401(k) for typical professionals.