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 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.