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.

Tax Disclaimer

This calculator provides estimates for informational purposes only. It is not tax advice. Connecticut tax brackets, recapture thresholds, personal exemption phase-outs, 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.