1Connecticut
Lowest21.3%
Overall effective tax rate
- Net
- Federal
- State
- FICA
- Federal income tax
- $7,670
- State income tax
- $2,550
- Payroll tax (FICA)
- $5,738
- Total tax
- $15,958
- Net income (annual)
- $59,043
Tax year 2026 · state vs state
Connecticut vs Illinois Income Tax Comparison (2026)
On a $75,000 salary (single filer, 2026), you pay $1,018 less state income tax a year in Connecticut than in Illinois, which is about $85 a month. At $150,000 the gap is $430 in favor of Connecticut.
Connecticut: up to 6.99%Illinois: 4.95% flatUpdated October 10, 2026
Compare Connecticut and Illinois for your income
Estimate for education only, not tax advice. 2026 federal and state rules, standard deductions, no local taxes. How we calculate.
State comparison
Comparing 2 states, sorted by lowest overall tax rate.
2Illinois
22.6%
Overall effective tax rate
- Net
- Federal
- State
- FICA
- Federal income tax
- $7,670
- State income tax
- $3,568
- Payroll tax (FICA)
- $5,738
- Total tax
- $16,975
- Net income (annual)
- $58,025
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💰 Monthly breakdown
Your take-home pay, spread across the year
Connecticut
Monthly gross$6,250
Monthly tax$1,330
Monthly take-home$4,920
Illinois
Monthly gross$6,250
Monthly tax$1,415
Monthly take-home$4,835
Estimates use 2026 federal and state rates, the standard deduction for your filing status and no local taxes. Rankings use state income tax only.
Connecticut vs Illinois: how the two systems differ
| Connecticut | Illinois | |
|---|---|---|
| Wage income tax | Progressive, 7 brackets | Flat 4.95% |
| Top rate | 6.99% | 4.95% |
| Lowest rate | 2% | 4.95% |
| Deductions and credits (single) | $15,000 personal exemption | $2,925 personal exemption |
State income tax and take-home pay at every salary
The same salary can leave you with different take-home pay depending on the state. This table applies each state’s 2026 rules to a single filer with no pre-tax contributions.
| Income | CT state tax | IL state tax | Difference | CT take-home | IL take-home |
|---|---|---|---|---|---|
| $30,000 | $425 | $1,340 | $915 less in Connecticut | $25,860 | $24,945 |
| $40,000 | $875 | $1,835 | $960 less in Connecticut | $33,445 | $32,485 |
| $50,000 | $1,325 | $2,330 | $1,005 less in Connecticut | $41,030 | $40,025 |
| $60,000 | $1,775 | $2,825 | $1,050 less in Connecticut | $48,615 | $47,565 |
| $75,000 | $2,550 | $3,568 | $1,018 less in Connecticut | $59,043 | $58,025 |
| $100,000 | $3,925 | $4,805 | $880 less in Connecticut | $75,255 | $74,375 |
| $150,000 | $6,850 | $7,280 | $430 less in Connecticut | $106,941 | $106,511 |
| $250,000 | $13,025 | $12,230 | $795 less in Illinois | $170,157 | $170,952 |
Single filer, 2026, federal standard deduction. Take-home is after federal, state and payroll tax. No local taxes.
Married filing jointly
| Income | CT state tax | IL state tax | Difference | CT take-home | IL take-home |
|---|---|---|---|---|---|
| $75,000 | $1,795 | $3,423 | $1,628 less in Connecticut | $62,828 | $61,200 |
| $100,000 | $2,920 | $4,660 | $1,740 less in Connecticut | $81,790 | $80,050 |
| $150,000 | $5,430 | $7,135 | $1,705 less in Connecticut | $117,755 | $116,050 |
| $250,000 | $11,060 | $12,085 | $1,025 less in Connecticut | $186,408 | $185,383 |
Married filing jointly, 2026, federal standard deduction. Uses each state's joint brackets where they differ.
Does the lower-tax state change as income rises?
For a single filer, Connecticut is the lower-tax state up to roughly $192,500 of income, and Illinois becomes the lower-tax state above that.
Rates side by side
Connecticut (single filers)
| 2% | Up to $10,000 |
| 4.5% | $10,001 to $50,000 |
| 5.5% | $50,001 to $100,000 |
| 6% | $100,001 to $200,000 |
| 6.5% | $200,001 to $250,000 |
| 6.9% | $250,001 to $500,000 |
| 6.99% | Over $500,000 |
Illinois (single filers)
| 4.95% | Over $0 |
Full details for each state: Connecticut income tax calculator and Illinois income tax calculator. Federal rates are on the 2026 federal tax brackets page.
Connecticut vs Illinois FAQ
Which has lower income tax, Connecticut or Illinois?+
Connecticut is lower at $75,000: $2,550 of state income tax versus $3,568 in Illinois. At $150,000 it is $6,850 in Connecticut and $7,280 in Illinois. For a single filer, Connecticut is the lower-tax state up to roughly $192,500 of income, and Illinois becomes the lower-tax state above that.
How much more do I keep on $100,000 in Connecticut versus Illinois?+
A single filer keeping $75,255 a year in Connecticut would keep $74,375 in Illinois after federal, state and payroll tax. The difference is $880 a year, or $73 a month.
How do the Connecticut and Illinois income tax systems differ?+
Connecticut uses progressive rates up to 6.99%; Illinois uses a flat 4.95% rate.
Are local taxes included in this Connecticut vs Illinois comparison?+
No. It covers federal income tax, Social Security, Medicare and state income tax only. City, county, sales and property taxes are not included, and they can change the real cost of living in each state.
Should I move from Connecticut to Illinois to save on taxes?+
State income tax is one cost among many. Property and sales taxes, housing, insurance and wages also differ, and you may owe tax to both states in the year you move. Use this comparison as one input and confirm details with a tax professional.
Sources
- Tax Foundation: 2026 state individual income tax rates and brackets
- IRS: Tax inflation adjustments for tax year 2026
Last checked October 10, 2026. Confirm with your state tax agency before filing.
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Estimates for education only, not tax, legal or financial advice. Not a substitute for a tax professional or your state revenue department.