Connecticut Income Tax Calculator

How to Use This Connecticut Income Tax Calculator

This Connecticut income tax calculator estimates your annual state and federal tax liability for 2026. Enter your gross wages, filing status, and any pre-tax deductions. Connecticut applies seven progressive brackets from 2% to 6.99%, with no standard deduction and a tax benefit recapture for higher earners.

For a per-paycheck breakdown, use the Connecticut paycheck calculator; to compare Connecticut with other states, use the general income tax calculator.

How Connecticut's Income Tax Works

Connecticut uses seven progressive brackets ranging from 2% to 6.99%. Unlike most states, Connecticut has no standard deduction. Instead, the state provides a personal exemption credit worth up to $600 for single filers based on a $15,000 exemption — but this phases out entirely at higher incomes.

Connecticut income tax applies to:

• W-2 wages and salaries — including bonuses and overtime. All wages are taxable without a standard deduction offset.
• Self-employment income — net earnings after deductible business expenses.
• Capital gains — taxed as ordinary income at regular Connecticut rates. Connecticut has no separate capital gains rate or exclusion.
• Retirement income — generally taxable, with a limited exemption for lower-income seniors (65+) with income below $75,000 single / $100,000 MFJ.

Connecticut's Tax Benefit Recapture — How Higher Earners Pay More

Connecticut uses a tax benefit recapture mechanism that is unusual among US states. Here is how it works:

Normally, a progressive bracket system lets everyone pay the low rates on the first dollars of income. In Connecticut, once a single filer's income exceeds approximately $200,000, the state adds a surcharge (calculated as a percentage of the "benefit" received from the lower 2% and 4.5% rates). As income continues to rise, the recapture phasing increases — until the lower brackets are entirely recaptured and the effective rate approaches the top rate of 6.99% on all income.

For a single filer at $400,000, simple bracket math would suggest some savings from the 2%–5.5% tiers. After the recapture, most of that savings is eliminated, and the effective Connecticut income tax rate is close to 6.99% across all income.

This calculator applies the recapture automatically — the displayed Connecticut tax reflects the correct amount after recapture.

FICA Taxes — Social Security and Medicare

FICA taxes are federal and apply to every Connecticut worker's income:

• Social Security: 6.2% on wages up to $176,100 (2025) or $184,500 (2026). No further withholding once you hit the wage base.
• Medicare: 1.45% on all wages with no cap.
• Additional Medicare: 0.9% on wages above $200,000 (single) or $250,000 (married jointly) — employee only, no employer match.

Step-by-Step Example — $120,000 Connecticut Single Filer (2026)

1. Gross wages: $120,000
2. Federal standard deduction: −$16,100 → federal taxable income: $103,900
3. Federal income tax (10% + 12% + 22% brackets): ≈ $15,258
4. FICA: $120,000 × 7.65% = $9,180
5. Connecticut taxable income: $120,000 (no standard deduction)
6. CT brackets: 2% × $10,000 = $200; 4.5% × $40,000 = $1,800; 5.5% × $50,000 = $2,750; 6% × $20,000 = $1,200. Total before recapture: $5,950. (Recapture not triggered at this income level for single.)
7. Total taxes: $15,258 + $9,180 + $5,950 = $30,388
8. Annual net income: $120,000 − $30,388 = $89,612

How to Reduce Your Connecticut Annual Tax Liability

• Maximize traditional 401(k) contributions — the 2026 limit is $23,500 ($31,000 if 50+). At a combined 5.5%–6% CT + 22%–24% federal marginal rate, every $1,000 contributed saves $275–$300 in taxes.
• Contribute to an HSA— $4,300 (self-only) or $8,550 (family) in 2026. Reduces both federal and Connecticut taxable income. With CT's high rates, the triple-tax advantage of HSAs is especially valuable.
• Dependent Care FSA — up to $5,000 of childcare expenses paid with pre-tax dollars reduces both federal and Connecticut taxable income.
• Connecticut 529 College Savings deduction — Connecticut taxpayers can deduct up to $5,000 (single) or $10,000 (MFJ) in CT Higher Education Trust (CHET) 529 contributions from Connecticut taxable income per year.
• Time capital gains carefully— Connecticut taxes capital gains as ordinary income with no preferential rate. Consider holding appreciated assets until eligible for favorable federal treatment, and be aware that Connecticut's 6.99% top rate adds significantly to capital gains tax burden for high earners.
• Update your CT-W4— Connecticut's withholding form. With no standard deduction, ensure your CT-W4 reflects your pre-tax deductions and correct filing status to avoid a large balance due at filing.

Retirement Income and Connecticut Taxes

Connecticut taxes most retirement income, but provides meaningful exemptions for lower-income retirees:

• Social Security benefits: Connecticut provides a graduated exemption based on federal adjusted gross income (AGI). If your federal AGI is under $75,000 (single) or $100,000 (married filing jointly), 100% of federally taxable Social Security benefits are exempt from Connecticut income tax. If your AGI is between $75,000–$100,000 (single) or $100,000–$150,000 (MFJ), 75% of Social Security is exempt. Above those upper thresholds, the full amount of Social Security that is taxed federally is also taxable in Connecticut.
• Pension and retirement income (age 65+, lower income): Connecticut taxpayers age 65 or older with income below $75,000 (single) or $100,000 (MFJ) may deduct up to 100% of qualifying pension and retirement income — including IRA and 401(k) distributions — from Connecticut income. For higher-income seniors, this deduction phases out completely.
• 401(k) and IRA distributions (under 65 or higher income): For workers or retirees who do not qualify for the age-and-income deduction, traditional 401(k) and IRA distributions are taxed as ordinary income at the same brackets (2%–6.99%) as wages. Connecticut has no separate capital gains rate; all income is taxed at ordinary rates.
• Military retirement pay: Connecticut does not offer a blanket exemption for military retirement income. Most military pensions are taxable as ordinary income unless the filer qualifies for the broader retirement income deduction based on age and income.

For retirees with AGI above $150,000 (MFJ), virtually all retirement income is fully taxable in Connecticut at regular rates — making Connecticut one of the higher-tax states for affluent retirees.

Connecticut Tax Credits and Deductions

Connecticut provides a limited set of credits and deductions that can reduce annual tax liability. Key items for 2026:

• Property tax credit: Connecticut allows a credit of up to $300 per return for property taxes paid on a primary residence or motor vehicle. This is a nonrefundable credit that directly reduces the tax you owe on Form CT-1040. Renters do not qualify. The credit phases out at higher incomes.
• Connecticut 529 College Savings deduction: Contributions to the Connecticut Higher Education Trust (CHET) 529 plan are deductible from Connecticut taxable income — up to $5,000 (single) or $10,000 (married filing jointly) per year. At a 5.5% CT rate, a $5,000 contribution saves $275 in Connecticut state tax annually.
• Connecticut Earned Income Tax Credit: Connecticut eliminated its state EITC in 2011 and as of 2026 has not reinstated it. Connecticut residents who qualify for the federal EITC do not receive a Connecticut state EITC.
• Personal exemption credit: A credit based on a $15,000 personal exemption ($24,000 MFJ). The credit is worth at most $600 for single filers and phases out entirely at higher incomes.
• Filing form and deadline: Connecticut state income tax is filed on Form CT-1040 (residents) or Form CT-1040NR/PY (nonresidents and part-year residents). The filing deadline is April 15. Connecticut allows automatic 6-month extensions for filing, but any tax owed is still due by April 15.

Tax Disclaimer

This calculator provides estimates for informational purposes only. It is not tax advice. Connecticut tax brackets, recapture thresholds, personal exemption phase-outs, Social Security exemption thresholds, and retirement income rules can change each year. Federal brackets, FICA wage bases, and standard deduction amounts also change annually. Consult a qualified Connecticut-licensed CPA or tax professional for guidance on your specific situation.