Connecticut Income Tax 2026: Brackets, Rates & Free Calculator
Connecticut has one of the more distinctive state income tax systems in the country: seven graduated brackets topping out at 6.99%, no standard deduction at all, and a personal exemption that shrinks as your income rises. If you live or work in the Nutmeg State, understanding how these pieces fit together is the difference between a tax bill you saw coming and one you did not.
This guide lays out Connecticut’s 2026 income tax brackets and rates for every filing status, explains the personal exemption and its phaseout, walks through a full worked example, and shows you how to estimate your own bill in seconds with our free Connecticut income tax calculator.
Connecticut 2026 income tax brackets
Connecticut uses a graduated, or marginal, tax system: only the income that falls inside each bracket is taxed at that bracket’s rate. Your first $10,000 is always taxed at 2%, even if your total income is far higher.
| Taxable income (single) | Tax rate |
|---|---|
| Up to $10,000 | 2% |
| $10,001 – $50,000 | 4.5% |
| $50,001 – $100,000 | 5.5% |
| $100,001 – $200,000 | 6% |
| $200,001 – $250,000 | 6.5% |
| $250,001 – $500,000 | 6.9% |
| Over $500,000 | 6.99% |
For married couples filing jointly, every bracket threshold is doubled: 2% up to $20,000, 4.5% to $100,000, 5.5% to $200,000, 6% to $400,000, 6.5% to $500,000, 6.9% to $1,000,000, and 6.99% above $1,000,000. The rates themselves are identical across filing statuses — only the thresholds change.
The key insight about marginal brackets is that moving into a higher bracket never taxes your entire income at the higher rate. A single filer earning $60,000 pays 2% on the first $10,000, 4.5% on the next $40,000, and 5.5% only on the last $10,000.
The personal exemption and its phaseout
Unlike most states, Connecticut offers no standard deduction. What it offers instead is a personal exemption subtracted from your Connecticut adjusted gross income (AGI) before the brackets are applied. The base amounts for 2026 are:
| Filing status | Personal exemption |
|---|---|
| Single | $15,000 |
| Married filing jointly | $24,000 |
| Married filing separately | $12,000 |
| Head of household | $19,000 |
The catch is the phaseout. The exemption shrinks as your Connecticut AGI rises and disappears entirely once you hit these thresholds: $44,000 for single filers, $71,000 for married filing jointly, $35,000 for married filing separately, and $56,000 for heads of household. If your AGI is above the threshold for your status, your exemption is $0 and your entire Connecticut AGI is taxable. This makes the exemption most valuable to lower- and middle-income filers, and irrelevant for higher earners.
Worked example: $60,000 income for a single filer
Let us walk through a complete calculation for a single filer with $60,000 of Connecticut AGI in 2026:
- Apply the personal exemption. At $60,000 of AGI, the filer is above the $44,000 single phaseout threshold, so the exemption is $0. Taxable income is the full $60,000.
- Apply the marginal brackets.
- 2% on the first $10,000 = $200
- 4.5% on the next $40,000 ($10,001–$50,000) = $1,800
- 5.5% on the remaining $10,000 ($50,001–$60,000) = $550
- Total Connecticut tax: $2,550. That is an effective rate of about 4.25% on the $60,000 of income.
Notice how the effective rate sits well below the 5.5% marginal rate — a common surprise for first-time filers. If the same filer had only $30,000 of AGI, they would get the full $15,000 exemption (below the $44,000 threshold), leaving $15,000 taxable and a bill of just $425.
How to estimate your Connecticut tax in 4 steps
- Find your Connecticut AGI. This generally starts from your federal AGI, adjusted for Connecticut-specific additions and subtractions (such as the treatment of Social Security benefits and pension income).
- Subtract your personal exemption. Use the full exemption if your AGI is below the phaseout start; it phases out to zero by the thresholds listed above.
- Run the result through the brackets. Apply each marginal rate only to the income inside that bracket, exactly as in the worked example.
- Use the calculator for speed. Our free Connecticut income tax calculator handles the exemption phaseout and bracket math automatically — enter your income and filing status and get an instant estimate.
Ways to lower your Connecticut tax bill
- Max out pre-tax retirement contributions. 401(k), 403(b), and traditional IRA contributions reduce the AGI that Connecticut starts from, which can also preserve more of your personal exemption if you are near a phaseout threshold.
- Use an HSA if you have a qualifying health plan. Contributions are deducted from income, and Connecticut follows the federal treatment.
- Know the retirement income breaks. Connecticut has been phasing in exclusions for pension, annuity, and Social Security income for eligible filers — worth checking if you are retired or nearing retirement.
- Time your income. If you have control over bonus timing or freelance invoicing, keeping AGI under a phaseout threshold can be worth real money because of how the exemption works.
Frequently asked questions
What are the Connecticut income tax brackets for 2026?
For single filers: 2% up to $10,000, 4.5% to $50,000, 5.5% to $100,000, 6% to $200,000, 6.5% to $250,000, 6.9% to $500,000, and 6.99% above $500,000. Married filing jointly thresholds are exactly double these amounts, with the same rates.
Does Connecticut have a standard deduction?
No. Connecticut has no standard deduction. Instead it offers a personal exemption ($15,000 single, $24,000 married filing jointly, $12,000 married filing separately, $19,000 head of household) that phases out completely at $44,000, $71,000, $35,000, and $56,000 of Connecticut AGI respectively.
What is Connecticut’s top income tax rate in 2026?
The top rate is 6.99%, applying to taxable income above $500,000 for single filers and above $1,000,000 for married couples filing jointly.
How can I estimate my Connecticut income tax?
Subtract your personal exemption (accounting for the phaseout) from your Connecticut AGI, apply the graduated brackets to the remainder, or skip the manual math with our free Connecticut income tax calculator.
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