United States · State income tax
Connecticut state income tax rate 2027.
Connecticut’s bracket schedule from the official source, with the 2026 figures and a labelled projected 2027 column.
Short answer: Connecticut has 7 brackets for 2026 with rates from 2% to 6.99%. The top rate starts at $500,000 of taxable income for single filers and $1,000,000 for joint filers. No different 2027 schedule is enacted yet, so the 2027 column carries the 2026 schedule forward and is labelled projected.
Estimate your tax
Result
Enter your Connecticut taxable income and press Estimate.
The Connecticut schedule
CGS 12-700(a)(10) (cga.ct.gov) sets the schedule for taxable years commencing on or after Jan 1, 2024; the 2026 Supplement (revised to Jan 1, 2026) does not amend 12-700. DRS TPG-211 (2026 withholding rules) states 2026 tables are unchanged from 2025 and prints the same rates. Dollar edges are statutory.
Single filers
| Taxable income | Rate, 2026 | Rate, 2027 (projected) |
|---|---|---|
| $0 to $10,000 | 2% | 2% |
| $10,000 to $50,000 | 4.5% | 4.5% |
| $50,000 to $100,000 | 5.5% | 5.5% |
| $100,000 to $200,000 | 6% | 6% |
| $200,000 to $250,000 | 6.5% | 6.5% |
| $250,000 to $500,000 | 6.9% | 6.9% |
| Over $500,000 | 6.99% | 6.99% |
Joint filers
| Taxable income | Rate, 2026 | Rate, 2027 (projected) |
|---|---|---|
| $0 to $20,000 | 2% | 2% |
| $20,000 to $100,000 | 4.5% | 4.5% |
| $100,000 to $200,000 | 5.5% | 5.5% |
| $200,000 to $400,000 | 6% | 6% |
| $400,000 to $500,000 | 6.5% | 6.5% |
| $500,000 to $1,000,000 | 6.9% | 6.9% |
| Over $1,000,000 | 6.99% | 6.99% |
Deductions, exemptions and local tax
Connecticut’s standard deduction, exemption and credit amounts are not stated here because they were not read from the Connecticut tax agency’s own pages on November 9, 2026. Use the state’s current return instructions. None of them is modelled.
None seen in sources cited. Statute adds benefit recapture and a 2% phase-out add-back: above $56,500 AGI (single) / $100,500 (joint) the 2% bracket is reduced and taxed at 4.5%; extra recapture amounts apply above $105,000 / $210,000 AGI (and higher tiers up to $500,000 / $1,000,000) per 12-700(a)(10). Not modelled.
What changes in 2027 (projected)
12-700(a)(10) applies to taxable years on or after Jan 1, 2024 with no end date, so 2027 equals 2026 under current law; no different 2027 schedule found.
The 2027 column above carries the 2026 schedule forward. That is a projection, not an enacted 2027 schedule, and it is labelled that way wherever it appears.
Worked example (2026 schedule)
A single filer with $80,000 of Connecticut taxable income owes $3,650 under the 2026 schedule, an effective rate of 4.56% and a marginal rate of 5.5%. A joint filer with $150,000 of Connecticut taxable income owes $6,750 under the 2026 schedule, an effective rate of 4.50% and a marginal rate of 5.5%. The 2027 projection for the same incomes is the same dollar amount ($3,650 and $6,750) because the 2026 schedule is carried forward.
Common mix-ups
- Connecticut's top rate is 7%. The top rate in 12-700(a)(10) and DRS TPG-211 is 6.99%.
- Connecticut lowered rates for 2026. DRS TPG-211 says the 2026 withholding calculation rules and tables are unchanged from 2025; the 2% to 6.99% schedule dates from 2024.
- The 2% bracket applies to everyone's first $10,000. The statute reduces the 2% bracket for higher AGI (starting at $56,500 single / $100,500 joint) and taxes the removed amount at 4.5%.
- Joint edges are different from single in a complicated way. Each joint edge is exactly double the single edge ($10,000 vs $20,000 up to $500,000 vs $1,000,000).
Method
The tool applies each bracket rate only to the slice of income inside that bracket, adds the slices and divides by income for the effective rate; the marginal rate is the rate of the bracket that contains your income. The 2027 line uses the 2026 schedule and is shown as projected. Nothing you type is sent to our servers; the maths runs in your browser. For a full paycheck including federal and payroll taxes, use the paycheck calculator, and for comparing states see the state income tax calculator.
What this does not cover
- Deductions, exemptions and credits. Enter income after them.
- Head of household, part-year or nonresident returns, and income taxed at special rates.
- Local income taxes and surtaxes beyond the bracket schedule (see the section above).
- Any 2027 law change that has not been enacted yet.
Figures read from the sources below on November 9, 2026. Last updated November 9, 2026.
Sources
- CGS Chapter 229, Sec. 12-700 (rate tables, phase-outs, recapture) (retrieved November 9, 2026)
- CGS Chapter 229 2026 Supplement (confirms 12-700 not amended in the supplement) (retrieved November 9, 2026)
- DRS TPG-211 2026 Withholding Calculation Rules (Rev. 12/25) (2026 rates unchanged from 2025) (retrieved November 9, 2026)
Frequently asked questions
What is the Connecticut state income tax rate for 2027?
Connecticut has not enacted a different 2027 schedule that this page could read, so the 2027 figures are projected by carrying forward the 2026 rates (2%, 4.5%, 5.5%, 6%, 6.5%, 6.9%, 6.99%).
What is the top Connecticut income tax rate?
6.99% under the 2026 schedule. It starts at $500,000 of taxable income for single filers and $1,000,000 for joint filers.
How much Connecticut income tax would I pay on $80,000?
A single filer with $80,000 of Connecticut taxable income owes $3,650 under the 2026 schedule, an effective rate of 4.56% and a marginal rate of 5.5%. The estimator above runs your own figure.
Does this page include deductions or credits?
No. It applies the rate schedule to the taxable income you enter, so subtract your deductions and exemptions first. It does not model credits, local taxes or surtaxes.
Is the 2027 result a forecast?
It is a projection. It carries the 2026 schedule forward and is labelled projected wherever it appears. Connecticut can change its rates or indexed brackets before the 2027 forms are issued.
Where does the information on this page come from?
Connecticut sources read on November 9, 2026: CGS Chapter 229, Sec. 12-700; CGS Chapter 229 2026 Supplement; DRS TPG-211 2026 Withholding Calculation Rules. The links in the Sources section go to the originals.
Why can my Connecticut tax be higher than the bracket table says?
12-700 adds a 2% bracket phase-out and flat add-back amounts for higher AGI, so the bracket table alone understates the tax.
Not legal or tax advice
Rates change and this is an unofficial guide, not run by any state tax agency; any 2027 figure that is not enacted is a projection. Nothing you type is transmitted anywhere. Confirm with the Connecticut tax agency or a tax professional before you file.