What is the top income tax rate in Connecticut for 2025?

The top marginal Connecticut income-tax rate for 2025 is 6.99%, which applies only to taxable income in the highest bracket — not to your whole income. Lower brackets are taxed at lower rates. (Source: Tax Foundation 2025; Connecticut Department of Revenue Services.)

Are these the only taxes on my income?

No. These are Connecticut state income-tax brackets only. On top of state tax you also owe federal income tax and FICA (Social Security + Medicare), and some cities or counties levy their own local income tax. This page covers the state schedule for the 2025 tax year.

Is my data sent anywhere when I use this calculator?

No. All calculations run entirely in your browser using JavaScript. No amounts, inputs, or personal data are ever transmitted to any server.

Connecticut Income Tax Brackets 2025 — 2% to 6.99%

Name: Connecticut Income Tax Brackets 2025 — 2% to 6.99%
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

See the official Connecticut 2025 income-tax brackets (single & married) and estimate your state tax instantly, in your browser.

Free Connecticut income tax brackets reference for 2025. See the graduated 2%–6.99% brackets for single and married-filing-jointly filers, standard deductions and exemptions, and estimate your Connecticut state income tax. Source: Tax Foundation 2025 + Connecticut Department of Revenue Services. Runs entirely in your browser; no data sent to any server. It runs free in your browser on Gera Tools, with nothing uploaded.

Last updated 17 June 2026 Source: Gera Tools

What are the Connecticut income tax brackets for 2025?

Connecticut has a graduated income tax for 2025 with marginal rates from 2% to a top rate of 6.99%. Each rate applies only to the income within its bracket; the full schedule for single and married filers is in the table above. (Source: Tax Foundation, 2025 State Individual Income Tax Rates and Brackets.)

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Connecticut Income Tax Brackets 2025

Connecticut levies a graduated individual income tax for 2025, with marginal rates from 2% up to a top rate of 6.99%. Each rate applies only to the slice of taxable income within its bracket.

Pick your filing status and enter your taxable income below to see the official 2025 bracket table, your estimated Connecticut state tax, and your marginal and effective rates. Everything runs in your browser — no data is transmitted.

Important: Connecticut levies a graduated income tax from 2% to a top rate of 6.99%. These are state income-tax brackets only — they exclude federal income tax, FICA, and any local city/county income taxes. Verify the current figures with the Connecticut Department of Revenue Services.