Connecticut Tax Brackets Guide – Connecticut uses a progressive state income tax system with seven marginal tax brackets ranging from 2% to 6.99%. If you live or work in Connecticut, understanding the Connecticut tax brackets is essential for accurate tax planning, withholding, and filing—especially for the 2025 tax year (returns due in 2026) and the 2026 tax year.
This comprehensive guide breaks down the current Connecticut income tax brackets, how they apply, recent changes, filing rules, and tips to help USA residents and taxpayers navigate CT state taxes effectively.
What Are Connecticut Tax Brackets?
Connecticut tax brackets determine the percentage of your Connecticut taxable income you owe in state income tax. The system is marginal, meaning you pay the lower rate only on income within each bracket and higher rates only on income above those thresholds.
Unlike flat-tax states, Connecticut’s graduated structure (enacted in 1991 and refined over time) aims to make higher earners pay a larger share. The top rate of 6.99% applies to income over $500,000 (single) or $1 million (joint). Brackets differ by filing status: single/married filing separately, head of household, and married filing jointly.
Connecticut taxable income starts with your federal adjusted gross income (AGI), plus or minus state-specific additions and subtractions (reported on Form CT-1040 Schedule 1). Personal exemptions (which phase out with higher AGI) further reduce taxable income.
Current Connecticut Income Tax Brackets for 2025 and 2026
The brackets below apply for tax years 2024 through at least 2026 (no changes announced for 2026). They remain in effect from the 2024 reductions to the lowest two rates.
Connecticut Tax Brackets 2025–2026 (Single and Married Filing Separately)
| Tax Rate | Taxable Income |
|---|---|
| 2% | $0 – $10,000 |
| 4.5% | $10,001 – $50,000 |
| 5.5% | $50,001 – $100,000 |
| 6% | $100,001 – $200,000 |
| 6.5% | $200,001 – $250,000 |
| 6.9% | $250,001 – $500,000 |
| 6.99% | Over $500,000 |
Connecticut Tax Brackets 2025–2026 (Head of Household)
| Tax Rate | Taxable Income |
|---|---|
| 2% | $0 – $16,000 |
| 4.5% | $16,001 – $80,000 |
| 5.5% | $80,001 – $160,000 |
| 6% | $160,001 – $320,000 |
| 6.5% | $320,001 – $400,000 |
| 6.9% | $400,001 – $800,000 |
| 6.99% | Over $800,000 |
Connecticut Tax Brackets 2025–2026 (Married Filing Jointly)
| Tax Rate | Taxable Income |
|---|---|
| 2% | $0 – $20,000 |
| 4.5% | $20,001 – $100,000 |
| 5.5% | $100,001 – $200,000 |
| 6% | $200,001 – $400,000 |
| 6.5% | $400,001 – $500,000 |
| 6.9% | $500,001 – $1,000,000 |
| 6.99% | Over $1,000,000 |
Note on high earners: Connecticut has complex phase-outs and recapture rules. For example, the 2% bracket shrinks for single filers with Connecticut AGI over $56,500 (and joint filers over $100,500), shifting more income to the 4.5% rate. Additional recapture amounts apply at higher AGI levels (e.g., over $105,000 single or $210,000 joint). This makes the system one of the most complex in the U.S.
How to Calculate Your Connecticut State Income Tax?
- Start with federal AGI (Form 1040, Line 11).
- Add/subtract Connecticut modifications (Schedule 1).
- Subtract personal exemptions (using Table A based on your Connecticut AGI and filing status). Exemptions phase out completely at higher AGI levels—for 2025:
- Single: Up to $15,000 (phases to $0 above ~$44,000 AGI).
- Married Filing Jointly: Up to $30,000 (phases down but retains a base amount).
- Apply the marginal brackets above to the resulting Connecticut taxable income.
- Subtract credits (e.g., expanded Earned Income Tax Credit, property tax credits).
Use the official CT-1040 Tax Calculation Schedule or myconneCT calculators for precision.
Recent Changes to Connecticut Tax Brackets
- 2024 update (still current): The lowest two rates dropped from 3% to 2% and 5% to 4.5%—the largest income tax cut in state history.
- Retirement income relief: 2025 marks 75% deductibility for qualifying IRA distributions (phasing to 100% in 2026), with pension/annuity deductions available up to 100% below certain AGI thresholds ($75,000 single / $100,000 joint).
- New credits for 2025+: Expanded EITC (+$250 with qualifying child), workforce housing, and more.
Connecticut vs. Federal Tax Brackets (2025)
Federal 2025 brackets (single filer) top out at 37% on income over $626,350. Connecticut’s top rate (6.99%) is much lower but stacks on top of federal tax. Most residents pay both—effective combined rates can exceed 40% for high earners in the top brackets.
Filing Requirements and Deadlines in Connecticut
You must file Form CT-1040 if you’re a full-year resident and:
- Had CT tax withheld, or
- Meet the gross income test for 2025: $15,000 (single), $24,000 (joint), $19,000 (head of household), or $12,000 (married filing separately).
Deadline: April 15, 2026 (for calendar-year filers). Extensions are available but don’t extend payment due date.
Other Connecticut Taxes to Know
While income tax gets the spotlight, Connecticut also has:
- Sales tax: 6.35% statewide (no local add-ons).
- Property tax: Among the highest effective rates in the U.S. (average ~1.48%).
- No estate tax for most (exemption ~$13.99 million in 2025).
Tips for Minimizing Your Connecticut Tax Bill
- Maximize retirement deductions (pensions, IRAs, Social Security).
- Contribute to eligible credits (EITC, CHET, workforce housing).
- Use myconneCT for free filing and calculators.
- Consider withholding adjustments if you have side income or bonuses.
- High earners: Work with a tax professional due to phase-outs and recapture.
Conclusion: Plan Ahead with the Connecticut Tax Brackets Guide
The Connecticut tax brackets for 2025 and 2026 remain stable following the 2024 rate cuts, offering relief at lower income levels while maintaining a progressive structure. Whether you’re a W-2 employee, retiree, or high earner, knowing your marginal rates and available deductions can save time and money at tax time.
For the most accurate calculation, always refer to the official Connecticut Department of Revenue Services (DRS) forms, Tax Calculation Schedule, and myconneCT portal. Consult a tax advisor for personalized advice, especially if your situation involves phase-outs, retirement income, or multi-state filing.
Stay informed—tax laws can change, but the current brackets provide a clear roadmap for Connecticut taxpayers in 2025 and beyond. File accurately and on time to avoid penalties!