Tax Bracket Calculator for Connecticut (CT) — Free Calculator

Connecticut Tax Brackets (2026)

Connecticut uses a graduated income tax system with a top marginal rate of 6.99%.

Connecticut Bracket Structure

3% on first $10,000; 5% on $10,001–$50,000; 5.5% on $50,001–$100,000; 6% on $100,001–$200,000; 6.5% on $200,001–$250,000; 6.9% on $250,001–$500,000; 6.99% above $500,000 (single filer)

Connecticut has a relatively high top rate of 6.99%. The state also has a "benefit recapture" rule that phases out the lower-bracket rates for high earners, effectively taxing all income at the top rate above certain thresholds.

Federal Tax Brackets Still Apply to Connecticut Residents

Regardless of Connecticut's state tax rules, all residents pay federal income tax. Federal brackets for 2024 range from 10% (on income up to $11,600 for single filers) to 37% (on income over $609,350). Your effective federal rate is typically well below the top marginal rate due to the graduated bracket structure.

Effective vs. Marginal Rate in Connecticut

Your marginal rate is the rate on your last dollar of income. Your effective rate is your total tax divided by total income. For Connecticut residents the marginal rate can reach 6.99% but most filers pay a lower effective rate. The median household income in Connecticut is $79,855.

Data: Tax Foundation (2024), IRS Statistics of Income, US Census Bureau ACS 2023. Updated 2024–2025. Figures reflect state averages — consult a licensed CPA for personalized tax advice.

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Frequently Asked Questions

What tax brackets apply to Connecticut residents?

Connecticut has a graduated income tax system. 3% on first $10,000; 5% on $10,001–$50,000; 5.5% on $50,001–$100,000; 6% on $100,001–$200,000; 6.5% on $200,001–$250,000; 6.9% on $250,001–$500,000; 6.99% above $500,000 (single filer). Federal brackets also apply on top of the state tax.

What is the difference between marginal and effective tax rate in Connecticut?

Your marginal rate is the rate on your highest dollar of income. Your effective rate is your total tax burden divided by total income. In Connecticut, even if the top marginal rate is 6.99%, most residents pay a lower effective rate because lower income portions are taxed at lower brackets.

Does Connecticut have different tax brackets for married filers?

Yes, Connecticut typically has different bracket thresholds for single vs. married filing jointly filers. Married joint filers often have brackets approximately twice as wide, reducing the marriage penalty. Check the Connecticut Department of Revenue for current bracket tables.

How does this tax bracket calculator work for Connecticut?

Enter your income and filing status. The calculator applies both federal and Connecticut state tax brackets to show your marginal rate, effective rate, and total estimated tax. Connecticut's graduated rate of up to 6.99% is applied to your state taxable income.