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Tax year 2026

Illinois vs New Jersey Income Tax — 2026

A single filer earning $100,000 pays $625 less per year in New Jersey than in Illinois — $52 a month. Illinois charges $4,805; New Jersey charges $4,180.

Why this pair has a page: two of the largest taxing states.

Illinois at $100K
$4,805
4.81%
New Jersey at $100K
$4,180
4.18%
Annual difference
$625
$52 a month
National ranks
42 vs 31
of 50, lowest tax first

The bill at every income

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

Illinois and New Jersey income tax compared at seven income levels, 2026
Gross incomeIllinois taxNew Jersey taxDifference
$50,000$2,330$1,215$1,115 less in NJ
$75,000$3,568$2,596$972 less in NJ
$100,000$4,805$4,180$625 less in NJ
$150,000$7,280$7,365$85 less in IL
$250,000$12,230$13,735$1,505 less in IL
$500,000$24,605$29,660$5,055 less in IL
$1,000,000$49,355$74,484$25,129 less in IL
Annual state income tax, Illinois versus New Jersey
IL at $50,000: $2,330IL at $50,000$2,330NJ at $50,000: $1,215NJ at $50,000$1,215IL at $75,000: $3,568IL at $75,000$3,568NJ at $75,000: $2,596NJ at $75,000$2,596IL at $100,000: $4,805IL at $100,000$4,805NJ at $100,000: $4,180NJ at $100,000$4,180IL at $150,000: $7,280IL at $150,000$7,280NJ at $150,000: $7,365NJ at $150,000$7,365IL at $250,000: $12,230IL at $250,000$12,230NJ at $250,000: $13,735NJ at $250,000$13,735IL at $500,000: $24,605IL at $500,000$24,605NJ at $500,000: $29,660NJ at $500,000$29,660IL at $1,000,000: $49,355IL at $1,000,000$49,355NJ at $1,000,000: $74,484NJ at $1,000,000$74,484

How the two systems differ

Illinois and New Jersey income tax systems compared
IllinoisNew Jersey
Tax structureFlat rateGraduated
Top marginal rate4.95%10.75%
Number of brackets17
Standard deduction (single)NoneNone
Personal exemption$2,925$1,000
Local income taxesNoNo
Capital gainsordinaryordinary
Population (2024)12,710,1589,500,851

By filing status

Illinois and New Jersey tax on $100,000 by filing status, 2026
Filing statusIllinoisNew JerseyDifference
Single$4,805$4,180$625 less in NJ
Married filing jointly$4,660$2,640$2,021 less in NJ
Married filing separately$4,805$4,180$625 less in NJ
Head of household$4,805$2,695$2,110 less in NJ

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, New Jersey costs $625 less per year than Illinois — $52 a month.

Illinois compared with New Jersey at $100,000
IllinoisNew JerseyDifference
State income tax$4,805$4,180$625
Per month$400$348$52
Effective rate4.81%4.18%0.63 pts
Marginal rate4.95%6.37%1.42 pts
Standard deduction$0$0$0
Taxable income$97,075$99,000$1,925
Tax structureFlat rateGraduated
Local income taxesNoNo

Full detail: Illinois · New Jersey · 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.New Jersey Division of TaxationState revenue department
    New Jersey Tax Rate Schedules - 2020 and After (linked from NJ Income Tax Rates, page updated 03/24/26)
    https://www.nj.gov/treasury/taxation/pdf/current/njtaxratesch.pdf
    Retrieved
  3. 3.Tax FoundationResearch organisation (cross-check)
    State Individual Income Tax Rates and Brackets, 2025
    https://taxfoundation.org/data/all/state/state-income-tax-rates/
    Retrieved

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