United States · 2025
Connecticut vs Illinois Income Tax 2025
At a $100K salary, Connecticut is about $200 cheaper in 2025.
State brackets
2%
Bracket 1
$0to$10,000
4.5%
Bracket 2
$10,001to$50,000
5.5%
Bracket 3
$50,001to$100,000
6%
Bracket 4
$100,001to$200,000
6.5%
Bracket 5
$200,001to$250,000
6.9%
Bracket 6
$250,001to$500,000
6.99%
Bracket 7
$500,000and up
State brackets
4.95%
Bracket 1
$0and up
At common incomes, what's the tax difference?
Federal + state income tax after the standard deduction, 2025. Excludes FICA.Compare your income
$
We'll pin your result at the top.Income
Connecticut tax
Illinois tax
Difference
$50,000single filer
$5,87211.7% effective
$6,34712.7% effective
$475 lessin Connecticut
$100,000single filer
$18,19918.2% effective
$18,39918.4% effective
$200 lessin Connecticut
$200,000single filer
$47,81723.9% effective
$46,96723.5% effective
$850 lessin Illinois
Federal income tax — same for both
7 brackets · 10–37% · applies on top of state rates
10%
to $11,925
12%
to $48,475
22%
to $103,350
24%
to $197,300
32%
to $250,525
35%
to $626,350
37%
$626,351+
CT
Connecticut
IL
Illinois