Estimate your Connecticut state income tax plus combined federal and CT state tax for 2026. 6.99% top rate.
Connecticut has progressive income tax rates from 3% to 6.99%. The top 6.99% rate applies to income over $500,000 (single) or $1 million (married). Connecticut does not tax Social Security income for most residents. Use the calculator above to estimate your combined federal and Connecticut state income tax for 2026. State tax figures use a simplified rate — for precise Connecticut state tax calculations, consult the Connecticut Department of Revenue or a licensed tax professional.
Connecticut uses a 6.99% top rate state income tax structure. Like most states, Connecticut starts its calculation from your federal Adjusted Gross Income (AGI), then applies state-specific adjustments — subtracting income Connecticut excludes from taxation (such as certain pension or Social Security income) and adding back any income Connecticut taxes that the federal government does not. After adjustments, the Connecticut standard deduction is applied, then the 6.99% top rate is applied to arrive at state taxable income.
Connecticut income tax is collected through employer paycheck withholding for W-2 employees and through quarterly estimated payments for self-employed residents and those with significant non-wage income. The Connecticut state return is generally due April 15, aligned with federal returns. Part-year residents and nonresidents who earn income sourced in Connecticut must also file a Connecticut return for that income portion.
Your Connecticut state income taxes are deductible on your federal Schedule A as part of the SALT (State and Local Tax) deduction, capped at $40,400 in 2026 under OBBBA. At the 22% federal bracket, paying $2,251 in Connecticut state income tax generates approximately $495 in federal tax savings, reducing the true net cost of your Connecticut taxes to about $1,756 for itemizing taxpayers.
Jordan is a single filer earning $75,000 in Connecticut. This shows how federal and Connecticut state income tax are calculated together.
Moving to a no-income-tax state (Texas, Florida, Nevada, or Wyoming) would save Jordan approximately $2,251/year ($187/month) in state income taxes. However, no-income-tax states often fund services through higher property taxes, sales taxes, or other fees, so a complete comparison requires evaluating all taxes together, not just income tax.
Connecticut Tax Rate and Annual Filing
Connecticut residents earning above the state filing threshold must file a Connecticut income tax return annually, typically due April 15. The 6.99% top rate applies after Connecticut-specific deductions and any state tax credits. Employers withhold Connecticut state income tax from employee paychecks throughout the year using Connecticut withholding tables, and any balance owed or refund due is settled when the annual state return is filed. Self-employed Connecticut residents make quarterly estimated payments to the state in addition to their federal quarterly estimated tax payments.
Federal SALT Deduction Reduces Net State Tax Cost
State income taxes paid in Connecticut reduce your federal taxable income through the SALT deduction (capped at $40,400 in 2026 under OBBBA). For a Connecticut resident in the 22% federal bracket paying $2,251 in state income tax, the SALT deduction recovers approximately $495 in federal taxes, so the true after-federal-benefit cost of Connecticut state income tax is about $1,756. This offset only benefits taxpayers who itemize deductions on federal Schedule A rather than taking the standard deduction.
Total Tax Burden: State Income Tax Is One Piece
State income tax is one component of your total tax burden in Connecticut. Property taxes, local income taxes (in some Connecticut cities and counties), and state and local sales taxes also contribute to your overall cost of living. When comparing Connecticut to other states, evaluate all tax types together rather than income tax in isolation. Use the calculator above to see your combined federal and Connecticut state effective rate at your specific income level.
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Connecticut has a 6.99% top rate state income tax for 2026. Connecticut has progressive income tax rates from 3% to 6.99%. The top 6.99% rate applies to income over $500,000 (single) or $1 million (married). Connecticut does not tax Social Security income for most residents. The state income tax is calculated separately from federal income tax and is paid through payroll withholding or quarterly estimated payments.
Connecticut has its own state standard deduction separate from the federal standard deduction ($15,750 single, $31,500 MFJ in 2026). For precise Connecticut state deduction amounts, consult the Connecticut Department of Revenue or a state tax professional.
Connecticut's 6.99% top rate state income tax can be compared to other states using our state tax calculator above. The U.S. average top marginal state income tax rate is approximately 5-6%. Nine states have no income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming), while California has the highest at 13.3%.
Connecticut offers state tax credits and deductions that may reduce your state tax liability. Common state credits include earned income credits, child tax credits, and credits for the elderly. Consult the Connecticut Department of Revenue website or a licensed tax professional for credits specific to your situation and income level.
Use the calculator above. Enter your income and CT is pre-selected as your state. The calculator computes your 2026 federal income tax using the One Big Beautiful Bill Act brackets (10%-37%), adds your estimated Connecticut state income tax (6.99% top rate simplified), and displays your total tax burden, combined effective rate, and annual take-home pay. All calculations happen instantly in your browser.