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Connecticut Income Tax Calculator 2026 — State Tax Brackets & Rates
Estimated Connecticut state income tax at common income levels, combined federal + state burden, and the full Connecticut tax bracket table — 2025 rates.
Reviewed for accuracy June 2026 by Gary S.
State tax type
Progressive
State tax at $75k
$3,375
Federal tax at $75k
$8,114
Combined eff. rate $75k
15.3%
10.2% effective rate — tax-efficient income level
Your 10.2% effective federal tax rate keeps you below the 18% threshold — a tax-efficient income level. After taxes you retain $67,330 (89.8%) of your $75,000 gross income.
- ›Standard deduction: $16,100 — you'd need more than $16,100 in itemized deductions to benefit from itemizing
- ›Marginal rate: 22% — each $1,000 added to a 401k or HSA saves $220 in federal tax
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Connecticut income tax at common income levels — 2025
Single filer, 2025 federal standard deduction ($15,000). Federal tax uses 2025 IRS brackets.
| Income | Connecticut state tax | State eff. rate | Federal tax | Total tax | Total eff. rate |
|---|---|---|---|---|---|
| $50,000 | $2,000 | 4.0% | $3,962 | $5,962 | 11.9% |
| $75,000 | $3,375 | 4.5% | $8,114 | $11,489 | 15.3% |
| $100,000 | $4,750 | 4.8% | $13,614 | $18,364 | 18.4% |
Single filer. Federal tax computed on gross income minus $15,000 standard deduction using 2025 IRS brackets. State tax estimates are approximate — consult a tax professional for exact liability. Does not include FICA (Social Security + Medicare), local taxes, or deductions beyond the standard deduction.
What is the Connecticut state income tax rate?
Connecticut has a six-bracket progressive system with rates from 2% to 6.99%. Connecticut also phases out lower-bracket benefits at higher incomes, which can create an unusual effective rate curve for higher earners.
| Taxable income (single) | Rate |
|---|---|
| $0 – $10,000 | 2% |
| $10,000 – $50,000 | 4.5% |
| $50,000 – $100,000 | 5.5% |
| $100,000 – $200,000 | 6% |
| $200,000 – $500,000 | 6.5% |
| Over $500,000 | 6.99% |
How to reduce your Connecticut income tax bill
Connecticut's top rate of 7% means every dollar you move into a pre-tax account reduces both your federal and Connecticut state tax simultaneously. The combined federal + state marginal rate for a middle-income earner in Connecticut can easily reach 30–35%, so pre-tax contributions are particularly valuable.
Max your 401k or 403b ($24,500 in 2026)
Traditional 401k contributions reduce your federal and Connecticut state taxable income dollar-for-dollar. At the 22% federal bracket plus 7% state, each $1,000 contributed saves $290 in current-year taxes. If your employer matches, prioritise contributing at least enough to capture the full match before any other savings goal.
Contribute to an HSA ($4,400 self-only in 2026)
HSA contributions are the only triple-tax-advantaged account in the US code: pre-tax in, tax-free growth, tax-free qualified withdrawals. Available to those enrolled in an eligible high-deductible health plan (HDHP). HSA balances roll over with no use-it-or-lose-it rule and can be invested in index funds for long-term tax-free growth.
Take the federal standard deduction
The 2025 federal standard deduction is $15,000 for single filers and $30,000 for married filing jointly. Most taxpayers (about 90%) are better off taking the standard deduction rather than itemising. Compare your deductible expenses (mortgage interest, state taxes, charitable gifts) to these thresholds before deciding.
Harvest tax losses in taxable investment accounts
Tax-loss harvesting — selling investments that are down to realise a capital loss — can offset capital gains and up to $3,000/year of ordinary income. The wash-sale rule prohibits repurchasing the same or substantially identical security within 30 days, but you can immediately buy a similar (not identical) fund to maintain market exposure while locking in the loss.
Filing your Connecticut income tax return: key facts
Federal and Connecticut state income tax returns are due on April 15 each year (or the next business day if April 15 falls on a weekend or holiday). An automatic six-month extension can be filed by April 15 — but the extension delays the filing deadline, not the payment deadline. If you expect to owe tax, you must pay an estimate by April 15 to avoid underpayment penalties even if you file later.
Connecticut residents file both a federal Form 1040 and a Connecticut state income tax return each year. The state return typically starts with federal Adjusted Gross Income (AGI) and applies state-specific additions and subtractions. Free filing options include the IRS Free File program (income under $84,000) and Connecticut's own free e-file portal for qualifying residents.
Self-employed workers and independent contractors in Connecticut who expect to owe $1,000 or more in federal tax must make quarterly estimated tax payments (due April 15, June 15, September 15, and January 15). Missing these payments triggers an underpayment penalty calculated at the federal short-term rate plus 3%. Use Form 1040-ES to calculate and submit quarterly payments.
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Connecticut income tax — frequently asked questions
What is the Connecticut state income tax rate for 2026?
Connecticut has a progressive tax with a top rate of 7%. The effective rate depends on income level — at $75,000, the effective Connecticut state tax rate is approximately 4.5%.
Does Connecticut have a state income tax?
Yes. Connecticut has a progressive income tax with rates up to 7%.
How much Connecticut state income tax do I owe on $75,000?
On a $75,000 gross income (single filer, 2025), estimated Connecticut state income tax is approximately $3,375 (effective rate: 4.5%). Combined with federal income tax of approximately $8,114, total tax is about $11,489 — an overall effective rate of 15.3%.
What is the combined federal and Connecticut state income tax at $100,000?
At $100,000 gross income (single filer, 2025 standard deductions): federal income tax is approximately $13,614, Connecticut state income tax is $4,750, for a combined total of approximately $18,364 — an overall effective rate of 18.4%.
How does Connecticut's income tax compare to other states?
Connecticut's top rate of 7% places it in the moderate range nationally. The nine states with no income tax pay $0 in state income tax; the highest-tax states (California at 13.3%, Hawaii at 11%) have the largest state income tax burdens.