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Tax year 2026

Illinois vs Wisconsin Income Tax — 2026

A single filer earning $100,000 pays $378 less per year in Wisconsin than in Illinois — $31 a month. Illinois charges $4,805; Wisconsin charges $4,428.

Why this pair has a page: bordering states.

Illinois at $100K
$4,805
4.81%
Wisconsin at $100K
$4,428
4.43%
Annual difference
$378
$31 a month
National ranks
42 vs 36
of 50, lowest tax first

The bill at every income

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

Illinois and Wisconsin income tax compared at seven income levels, 2026
Gross incomeIllinois taxWisconsin taxDifference
$50,000$2,330$1,577$753 less in WI
$75,000$3,568$2,944$624 less in WI
$100,000$4,805$4,428$378 less in WI
$150,000$7,280$7,309$29 less in IL
$250,000$12,230$12,609$379 less in IL
$500,000$24,605$29,774$5,169 less in IL
$1,000,000$49,355$68,024$18,669 less in IL
Annual state income tax, Illinois versus Wisconsin
IL at $50,000: $2,330IL at $50,000$2,330WI at $50,000: $1,577WI at $50,000$1,577IL at $75,000: $3,568IL at $75,000$3,568WI at $75,000: $2,944WI at $75,000$2,944IL at $100,000: $4,805IL at $100,000$4,805WI at $100,000: $4,428WI at $100,000$4,428IL at $150,000: $7,280IL at $150,000$7,280WI at $150,000: $7,309WI at $150,000$7,309IL at $250,000: $12,230IL at $250,000$12,230WI at $250,000: $12,609WI at $250,000$12,609IL at $500,000: $24,605IL at $500,000$24,605WI at $500,000: $29,774WI at $500,000$29,774IL at $1,000,000: $49,355IL at $1,000,000$49,355WI at $1,000,000: $68,024WI at $1,000,000$68,024

How the two systems differ

Illinois and Wisconsin income tax systems compared
IllinoisWisconsin
Tax structureFlat rateGraduated
Top marginal rate4.95%7.65%
Number of brackets14
Standard deduction (single)None$13,960
Personal exemption$2,925$700
Local income taxesNoNo
Capital gainsordinarypreferential
Population (2024)12,710,1585,960,975

By filing status

Illinois and Wisconsin tax on $100,000 by filing status, 2026
Filing statusIllinoisWisconsinDifference
Single$4,805$4,428$378 less in WI
Married filing jointly$4,660$3,795$865 less in WI
Married filing separately$4,805$4,861$55 less in IL
Head of household$4,805$4,428$378 less in WI

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, Wisconsin costs $378 less per year than Illinois — $31 a month.

Illinois compared with Wisconsin at $100,000
IllinoisWisconsinDifference
State income tax$4,805$4,428$378
Per month$400$369$31
Effective rate4.81%4.43%0.38 pts
Marginal rate4.95%5.3%0.35 pts
Standard deduction$0$4,374$4,374
Taxable income$97,075$94,926$2,149
Tax structureFlat rateGraduated
Local income taxesNoNo

Full detail: Illinois · Wisconsin · 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.Wisconsin Department of RevenueState revenue department
    2026 Form 1-ES Instructions - Estimated Income Tax for Individuals, Estates, and Trusts (D-101A, R. 1-26)
    https://www.revenue.wi.gov/TaxForms2026/2026-Form1-ES-inst.pdf
    Retrieved · Carries the complete 2026 tax rate schedules (A, B, C), the 2026 standard deduction schedules with phase-out thresholds and rates, and the $700 / $250 exemptions. States the law is as enacted January 16, 2026.

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