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Tax year 2026

Illinois vs Missouri Income Tax — 2026

A single filer earning $100,000 pays $1,043 less per year in Missouri than in Illinois — $87 a month. Illinois charges $4,805; Missouri charges $3,763.

Why this pair has a page: bordering states.

Illinois at $100K
$4,805
4.81%
Missouri at $100K
$3,763
3.76%
Annual difference
$1,043
$87 a month
National ranks
42 vs 26
of 50, lowest tax first

The bill at every income

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

Illinois and Missouri income tax compared at seven income levels, 2026
Gross incomeIllinois taxMissouri taxDifference
$50,000$2,330$1,413$918 less in MO
$75,000$3,568$2,588$980 less in MO
$100,000$4,805$3,763$1,043 less in MO
$150,000$7,280$6,113$1,168 less in MO
$250,000$12,230$10,813$1,418 less in MO
$500,000$24,605$22,563$2,043 less in MO
$1,000,000$49,355$46,063$3,293 less in MO
Annual state income tax, Illinois versus Missouri
IL at $50,000: $2,330IL at $50,000$2,330MO at $50,000: $1,413MO at $50,000$1,413IL at $75,000: $3,568IL at $75,000$3,568MO at $75,000: $2,588MO at $75,000$2,588IL at $100,000: $4,805IL at $100,000$4,805MO at $100,000: $3,763MO at $100,000$3,763IL at $150,000: $7,280IL at $150,000$7,280MO at $150,000: $6,113MO at $150,000$6,113IL at $250,000: $12,230IL at $250,000$12,230MO at $250,000: $10,813MO at $250,000$10,813IL at $500,000: $24,605IL at $500,000$24,605MO at $500,000: $22,563MO at $500,000$22,563IL at $1,000,000: $49,355IL at $1,000,000$49,355MO at $1,000,000: $46,063MO at $1,000,000$46,063

How the two systems differ

Illinois and Missouri income tax systems compared
IllinoisMissouri
Tax structureFlat rateGraduated
Top marginal rate4.95%4.7%
Number of brackets18
Standard deduction (single)None$16,100
Personal exemption$2,925None
Local income taxesNoYes
Capital gainsordinarypreferential
Population (2024)12,710,1586,245,466

By filing status

Illinois and Missouri tax on $100,000 by filing status, 2026
Filing statusIllinoisMissouriDifference
Single$4,805$3,763$1,043 less in MO
Married filing jointly$4,660$3,006$1,654 less in MO
Married filing separately$4,805$3,763$1,043 less in MO
Head of household$4,805$3,384$1,421 less in MO

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, Missouri costs $1,043 less per year than Illinois — $87 a month.

Illinois compared with Missouri at $100,000
IllinoisMissouriDifference
State income tax$4,805$3,763$1,043
Per month$400$314$87
Effective rate4.81%3.76%1.04 pts
Marginal rate4.95%4.7%0.25 pts
Standard deduction$0$16,100$16,100
Taxable income$97,075$83,900$13,175
Tax structureFlat rateGraduated
Local income taxesNoYes

Local taxes are not included above. Missouri 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 · Missouri · 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.Missouri Department of RevenueState revenue department
    2026 Missouri Withholding Tax Formula
    https://dor.mo.gov/forms/Withholding%20Formula_2026.pdf
    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.