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Tax year 2026

Illinois vs Washington Income Tax — 2026

A single filer earning $100,000 pays $4,805 less per year in Washington than in Illinois — $400 a month. Illinois charges $4,805; Washington charges $0.

Why this pair has a page: common relocation pair.

Illinois at $100K
$4,805
4.81%
Washington at $100K
$0
0.00%
Annual difference
$4,805
$400 a month
National ranks
42 vs 8
of 50, lowest tax first

The bill at every income

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

Illinois and Washington income tax compared at seven income levels, 2026
Gross incomeIllinois taxWashington taxDifference
$50,000$2,330$0$2,330 less in WA
$75,000$3,568$0$3,568 less in WA
$100,000$4,805$0$4,805 less in WA
$150,000$7,280$0$7,280 less in WA
$250,000$12,230$0$12,230 less in WA
$500,000$24,605$0$24,605 less in WA
$1,000,000$49,355$0$49,355 less in WA
Annual state income tax, Illinois versus Washington
IL at $50,000: $2,330IL at $50,000$2,330WA at $50,000: $0WA at $50,000$0IL at $75,000: $3,568IL at $75,000$3,568WA at $75,000: $0WA at $75,000$0IL at $100,000: $4,805IL at $100,000$4,805WA at $100,000: $0WA at $100,000$0IL at $150,000: $7,280IL at $150,000$7,280WA at $150,000: $0WA at $150,000$0IL at $250,000: $12,230IL at $250,000$12,230WA at $250,000: $0WA at $250,000$0IL at $500,000: $24,605IL at $500,000$24,605WA at $500,000: $0WA at $500,000$0IL at $1,000,000: $49,355IL at $1,000,000$49,355WA at $1,000,000: $0WA at $1,000,000$0

How the two systems differ

Illinois and Washington income tax systems compared
IllinoisWashington
Tax structureFlat rateNo income tax
Top marginal rate4.95%None
Number of brackets1—
Standard deduction (single)None—
Personal exemption$2,925—
Local income taxesNoNo
Capital gainsordinaryseparate
Population (2024)12,710,1587,958,180

By filing status

Illinois and Washington tax on $100,000 by filing status, 2026
Filing statusIllinoisWashingtonDifference
Single$4,805$0$4,805 less in WA
Married filing jointly$4,660$0$4,660 less in WA
Married filing separately$4,805$0$4,805 less in WA
Head of household$4,805$0$4,805 less in WA

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, Washington costs $4,805 less per year than Illinois — $400 a month.

Illinois compared with Washington at $100,000
IllinoisWashingtonDifference
State income tax$4,805$0$4,805
Per month$400$0$400
Effective rate4.81%0.00%4.81 pts
Marginal rate4.95%None4.95 pts
Standard deduction$0—$0
Taxable income$97,075—$97,075
Tax structureFlat rateNo income tax
Local income taxesNoNo

Full detail: Illinois · Washington · methodology

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.Washington State Department of RevenueState revenue department
    Income tax
    https://dor.wa.gov/taxes-rates/income-tax
    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 · Lists Washington as taxing capital gains income only.

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