How to Use This Calculator
Enter your income, filing status, and any deductions. The calculator computes your Connecticut state income tax alongside your federal tax, showing exactly how much goes to each and what you take home.
The most useful thing to try? Compare different income levels to see how Connecticut's brackets affect your tax bill, then look at how combined federal + state taxes shape your total take-home pay.
Here's what each field means:
Annual Income is your total earnings before any taxes. Include wages, freelance income, investment income, and any other sources.
Filing Status determines which set of tax brackets and deductions apply. Connecticut uses filing statuses similar to the federal system — single, married filing jointly, married filing separately, and head of household.
Connecticut Income Tax: What You Need to Know
Connecticut uses a progressive income tax system with rates ranging from 2% to 6.99%. Like the federal system, this means your income is taxed in layers — each bracket only applies to the income within that range, not your entire income.
Connecticut Tax Brackets (Single Filers)
| Taxable Income | Tax Rate |
|---|---|
| $0 - $10,000 | 2% |
| $10,000 - $50,000 | 4.5% |
| $50,000 - $100,000 | 5.5% |
| $100,000 - $200,000 | 6% |
| $200,000 - $250,000 | 6.5% |
| $250,000 - $500,000 | 6.9% |
| $500,000+ | 6.99% |
A Real Example
Let's say you're a single filer earning $85,000 in Connecticut. After applying the standard deduction, your income flows through each bracket:
Your approximate Connecticut state income tax would be around $3,975, for an effective state tax rate of about 4.7%.
Remember, this is just the state portion. You'll also owe federal income tax and FICA taxes on top of this.
Deductions and Exemptions
Deductions: Connecticut uses its own system of exemptions and deductions rather than a traditional standard deduction.
Personal exemptions of $15,000 (single) or $24,000 (MFJ), which phase out at higher incomes. Connecticut offers a property tax credit of up to $300 and an Earned Income Tax Credit equal to 40% of the federal EITC.
Local Taxes
No local income taxes in Connecticut.
What's Unique About Connecticut
Connecticut has an unusual tax system. Instead of a standard deduction, it uses a personal exemption and a "tax recapture" system that can effectively increase rates for higher earners. If your Connecticut AGI exceeds certain thresholds, a portion of your tax benefit from lower brackets gets clawed back, meaning your effective rate can be higher than the stated bracket rate. Connecticut also does not tax Social Security benefits for most residents.
Recent Changes
Connecticut has maintained its bracket structure but adjusted thresholds. The state increased its Earned Income Tax Credit percentage in recent years.
How to Use This Calculator Strategically
Model a raise or job change. See how additional income moves through Connecticut's brackets and affects your effective tax rate.
Compare filing statuses. If you're married, run the numbers both jointly and separately. The better option depends on your specific income situation.
Plan your deductions. Test how maximizing retirement contributions or other deductions affects your Connecticut tax bill.
Evaluate a move. Compare Connecticut's rates to other states you're considering. The difference in take-home pay might surprise you.
References
- Connecticut Department of Revenue Services. (2025). Income Tax.
This calculator is for educational purposes only and does not constitute tax or financial advice. Tax rates, brackets, and rules change regularly. Consult a qualified tax professional for guidance specific to your situation.