Connecticut Income Tax Calculator
Estimate your combined federal and Connecticut state income tax. Top Connecticut rate: 7.0%.
Tax Information
Basics
Earned Income
Your Earned Income
(W-2 box 1)
(W-2 box 2)
Other Family Incomes
Unemployment, retirement pay, etc.
Deductions & Proposed Credits
Proposed to be tax-free
Proposed to be tax-free
Max $10,000 for qualified vehicle
Standard Deductions (2025):
- • Single / MFS: $15,000
- • Married Filing Jointly: $30,000
- • Head of Household: $22,500
If your itemized deductions exceed the standard deduction, the calculator will automatically use itemized.
Estimated Total Income Tax
$16,851.50
Total tax owed (Fed + State + FICA)
Federal Tax
$8,114.00
State Tax
$3,000.00
FICA Tax
$5,737.50
After-Tax Income
$58,148.50
Effective Tax Rate
22.47%
Marginal Tax Rate
22%
Taxable Income
$75,000.00
Income Breakdown
Tax by Bracket
Tax Bracket Details
Understanding Your Tax Rates
- •Effective Tax Rate (22.47%): This is the actual percentage of your income that goes to taxes. It's calculated as total tax divided by total income.
- •Marginal Tax Rate (22%): This is the tax rate on your last dollar of income. Any additional income will be taxed at this rate.
- •Progressive Taxation: The U.S. uses a progressive tax system, meaning different portions of your income are taxed at different rates.
Tax Summary
Connecticut Income Tax Overview
Connecticut uses a graduated income tax with rates from 3% to 6.99%, with the top rate applying to income above $500,000 for single filers.
How Connecticut state income tax works
Connecticut's top marginal income tax rate is 7.0%. Most states use graduated brackets, meaning only the income within each bracket is taxed at that rate — not your entire income. The federal calculator above shows your federal bracket breakdown; your Connecticut state liability would be calculated separately on top of that.
When planning your budget in Connecticut, it's important to factor in both federal and state income taxes alongside other major expenses like housing. A Connecticut homeowner paying property taxes at the 1.79% effective rate on a $430,000 median-priced home will owe roughly $7,697 in property taxes annually — a separate expense from income taxes.
Federal income tax brackets (2025)
Regardless of which state you live in, you owe federal income tax on your taxable income. The 2025 federal brackets for single filers are: 10% (up to $11,925), 12% ($11,926–$48,475), 22% ($48,476–$103,350), 24% ($103,351–$197,300), 32% ($197,301–$250,525), 35% ($250,526–$626,350), and 37% (above $626,350). The calculator above computes your federal obligation using these brackets plus your standard or itemized deductions.
Note: This calculator estimates federal income tax only. State income tax calculations vary significantly by state and may depend on filing status, deductions, and credits specific to Connecticut. Consult a tax professional for personalized advice.
Income tax calculators for other states
View all 50 US state calculators →Also see: Connecticut Mortgage Calculator
Estimate your monthly mortgage payment with Connecticut's property tax rate of 1.79% already factored in.
Connecticut Mortgage Calculator →