How much is Connecticut income tax?
Estimate your Connecticut state income tax for 2026. Type your federal AGI and filing status; the page applies Connecticut's deduction, exemptions, and rates. An estimate, not tax advice.
- Connecticut income tax
- $3,375.00
On $75,000.00 of AGI, filing Single, Connecticut income tax is $3,375.00 (4.5% effective).
- State income tax
- $3,375.00
- Effective rate
- 4.5%
- State marginal rate
- 5.5%
- State taxable income
- $75,000.00
- Deduction
- $0.00
- Exemptions
- $0.00
- Credits
- $0.00
Connecticut income tax: $3,375.00. On $75,000.00 of AGI, filing Single, Connecticut income tax is $3,375.00 (4.5% effective).
Connecticut income tax by federal adjusted gross income
The results are estimates for information only. They are not financial, tax, or legal advice. Check the numbers with your lender or a qualified professional before you decide. Terms of use
How to calculate
Estimates 2026 Connecticut income tax from federal AGI, filing status, and dependents.
Example with the default inputs (Filing status Single, Federal adjusted gross income $75,000.00, Dependents 0): On $75,000.00 of AGI, filing Single, Connecticut income tax is $3,375.00 (4.5% effective).
Method: Taxable income = AGI − larger of standard or itemized deduction − exemptions; tax = state rates on taxable income − credits.
- An estimate for a full-year resident, 2026 rates, not tax advice.
- Starts from federal AGI; Connecticut additions and subtractions are not modelled.
- Not modelled for Connecticut: The 2% rate phase-out, tax recapture, and personal tax credits (1% to 75%) are not modelled, so the estimate runs high for most incomes. No itemized deductions: CT-1040 has neither a standard nor an itemized deduction (2025 CT-1040 instructions).
- Not modelled: part-year and nonresident returns, other state credits, and state AMT.
Worked examples
Each example is checked against the calculator on every build.
- Filing status Single, Federal adjusted gross income $50,000.00, Dependents 0 gives State taxable income $50,000.00, State income tax $2,000.00, Connecticut income tax $2,000.00.Source: CT DRS, TPG-211 2026 Withholding Calculation Rules (Tables A and B), https://portal.ct.gov/-/media/drs/forms/2025/wth/tpg-211_1225.pdf (worked from it at AGI $50,000, single)
- Filing status Married filing jointly, Federal adjusted gross income $100,000.00, Dependents 2 gives State taxable income $100,000.00, State income tax $4,000.00, Connecticut income tax $4,000.00.
- Filing status Head of household, Federal adjusted gross income $200,000.00, Dependents 1 gives State taxable income $200,000.00, State income tax $10,000.00, Connecticut income tax $10,000.00.
Other questions people ask
What is the Connecticut income tax rate?
Connecticut taxes income at 2% to 6.99% in 7 brackets (single filers). For a single filer the schedule is 2% from $0, 4.5% from $10,000, 5.5% from $50,000, 6% from $100,000, 6.5% from $200,000, 6.9% from $250,000, 6.99% above $500,000 of taxable income. These are the 2026 rates.
How is Connecticut income tax calculated?
Start from federal adjusted gross income. Subtract the larger of the Connecticut standard deduction and your itemized deductions, then the exemptions. Apply the rates to what is left and subtract any credits. Connecticut has no standard deduction in this model. The model takes a personal exemption of $15,000 ($24,000 joint).
Does Connecticut have a local income tax?
This page has no local income tax for Connecticut; if your city or county has one, add it yourself.
What does this Connecticut calculator leave out?
The 2% rate phase-out, tax recapture, and personal tax credits (1% to 75%) are not modelled, so the estimate runs high for most incomes. No itemized deductions: CT-1040 has neither a standard nor an itemized deduction (2025 CT-1040 instructions). It also leaves out state additions and subtractions to federal AGI (such as retirement or Social Security exclusions), part-year and nonresident returns, and credits such as child care, earned income, and tax paid to another state.
Which tax year do the Connecticut rates cover?
Tax year 2026, the return you file in 2027. They come from CT DRS.
Which states have no income tax on wages?
Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. They have no page of their own, because there is no wage income tax to work out; the state income tax calculator answers 0 for them. Federal income tax and Social Security and Medicare still apply.
Is this the same as my paycheck withholding?
No. This is the tax for the whole year on your return. Your employer withholds by the state's own withholding formula, so your refund or balance due is the difference between the two.