How does Connecticut's progressive income tax work?

Connecticut uses a progressive (graduated) income tax system with multiple tax brackets. Only the income within each bracket is taxed at that bracket's rate, so moving into a higher bracket doesn't increase the tax on your lower income.

What are the Connecticut tax brackets for 2026?

Connecticut has multiple income tax brackets for 2026. Use our calculator above to see exactly which brackets apply to your income and how much you'll owe in state taxes.

Does Connecticut have a standard deduction?

Connecticut does not offer a state standard deduction. Taxable income may be based on federal adjusted gross income with certain state-specific adjustments.

How do I calculate my total Connecticut tax bill?

Your total tax includes federal income tax (10%–37%), Social Security (6.2% on the first $176,100), Medicare (1.45%), and Connecticut state income tax. Use our free calculator above for an instant breakdown.

Connecticut Income Tax Calculator 2026

Estimate your Connecticut (CT) income tax for 2026. Connecticut has a progressive state income tax. Enter your income below and click “Calculate Taxes” for an instant breakdown.

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Connecticut Income Tax Overview

Connecticut uses a progressive income tax system with multiple brackets. Higher portions of your income are taxed at higher rates.

Frequently Asked Questions

How does Connecticut's progressive income tax work?: Connecticut uses a progressive (graduated) income tax system with multiple tax brackets. Only the income within each bracket is taxed at that bracket's rate, so moving into a higher bracket doesn't increase the tax on your lower income.
What are the Connecticut tax brackets for 2026?: Connecticut has multiple income tax brackets for 2026. Use our calculator above to see exactly which brackets apply to your income and how much you'll owe in state taxes.
Does Connecticut have a standard deduction?: Connecticut does not offer a state standard deduction. Taxable income may be based on federal adjusted gross income with certain state-specific adjustments.
How do I calculate my total Connecticut tax bill?: Your total tax includes federal income tax (10%–37%), Social Security (6.2% on the first $176,100), Medicare (1.45%), and Connecticut state income tax. Use our free calculator above for an instant breakdown.

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