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Tax year 2026

Illinois vs Iowa Income Tax — 2026

A single filer earning $100,000 pays $1,657 less per year in Iowa than in Illinois — $138 a month. Illinois charges $4,805; Iowa charges $3,148.

Why this pair has a page: bordering states.

Illinois at $100K
$4,805
4.81%
Iowa at $100K
$3,148
3.15%
Annual difference
$1,657
$138 a month
National ranks
42 vs 17
of 50, lowest tax first

The bill at every income

Single filer, standard deduction, no dependents. State income tax only.

Illinois and Iowa income tax compared at seven income levels, 2026
Gross incomeIllinois taxIowa taxDifference
$50,000$2,330$1,248$1,082 less in IA
$75,000$3,568$2,198$1,370 less in IA
$100,000$4,805$3,148$1,657 less in IA
$150,000$7,280$5,048$2,232 less in IA
$250,000$12,230$8,848$3,382 less in IA
$500,000$24,605$18,348$6,257 less in IA
$1,000,000$49,355$37,348$12,007 less in IA
Annual state income tax, Illinois versus Iowa
IL at $50,000: $2,330IL at $50,000$2,330IA at $50,000: $1,248IA at $50,000$1,248IL at $75,000: $3,568IL at $75,000$3,568IA at $75,000: $2,198IA at $75,000$2,198IL at $100,000: $4,805IL at $100,000$4,805IA at $100,000: $3,148IA at $100,000$3,148IL at $150,000: $7,280IL at $150,000$7,280IA at $150,000: $5,048IA at $150,000$5,048IL at $250,000: $12,230IL at $250,000$12,230IA at $250,000: $8,848IA at $250,000$8,848IL at $500,000: $24,605IL at $500,000$24,605IA at $500,000: $18,348IA at $500,000$18,348IL at $1,000,000: $49,355IL at $1,000,000$49,355IA at $1,000,000: $37,348IA at $1,000,000$37,348

How the two systems differ

Illinois and Iowa income tax systems compared
IllinoisIowa
Tax structureFlat rateFlat rate
Top marginal rate4.95%3.8%
Number of brackets11
Standard deduction (single)None$16,100
Personal exemption$2,925$40 credit
Local income taxesNoYes
Capital gainsordinaryordinary
Population (2024)12,710,1583,241,488

By filing status

Illinois and Iowa tax on $100,000 by filing status, 2026
Filing statusIllinoisIowaDifference
Single$4,805$3,148$1,657 less in IA
Married filing jointly$4,660$2,496$2,164 less in IA
Married filing separately$4,805$3,148$1,657 less in IA
Head of household$4,805$2,842$1,963 less in IA

Change the assumptions

Adjust income and filing status, or swap either state. The URL updates so you can share the exact comparison.

At $100,000 as a single filer, Iowa costs $1,657 less per year than Illinois — $138 a month.

Illinois compared with Iowa at $100,000
IllinoisIowaDifference
State income tax$4,805$3,148$1,657
Per month$400$262$138
Effective rate4.81%3.15%1.66 pts
Marginal rate4.95%3.8%1.15 pts
Standard deduction$0$16,100$16,100
Taxable income$97,075$83,900$13,175
Tax structureFlat rateFlat rate
Local income taxesNoYes

Local taxes are not included above. Iowa has localities that levy their own income tax on top of the state figure. See each state page for the rates that apply.

Full detail: Illinois · Iowa · methodology

Local income taxes change this picture

What this comparison leaves out

Sources for both states

  1. 1.Illinois Department of RevenueState revenue department
    FY 2026-15, What's New for Illinois Income Taxes
    https://tax.illinois.gov/research/publications/bulletins/fy-2026-15.html
    Retrieved · "The personal exemption amount for tax year 2026 will increase to $2,925." Also states the $500,000 / $250,000 AGI cut-off.
  2. 2.Iowa Department of RevenueState revenue department
    IDR Announces 2026 Individual Income Tax and Interest Rates
    https://revenue.iowa.gov/press-release/2025-10-21/idr-announces-2026-individual-income-tax-and-interest-rates
    Retrieved
  3. 3.Tax FoundationResearch organisation (cross-check)
    State Individual Income Tax Rates and Brackets, 2026
    https://taxfoundation.org/data/all/state/state-income-tax-rates-2026/
    Retrieved

Figures on this page were last checked against these sources on . Found something wrong? Report it.