Connecticut income tax goes up to 6.99% at the top bracket. Calculate your combined federal + state effective tax rate for 2026. Formula shown, sources cited — no account required.
Connecticut's graduated income tax starts at 3.0% and climbs to 6.99% at the top bracket, reached at relatively high income levels for single filers and joint filers. For a median earner at $96,049, the blended effective state rate typically lands in the 5–6% range after exemptions. Connecticut conforms to federal adjusted gross income for most purposes, and the standard deduction reduces taxable income before the state rates apply. One Connecticut-specific feature is the property tax credit, which allows residents to offset up to $300 in property taxes paid against their state income tax liability — a modest but real benefit given the state's high property tax environment. At the combined federal and state level, a median Connecticut household typically faces an effective all-in rate in the 26–30% range. Use the tax bracket calculator to see exactly how Connecticut's graduated structure applies to your income and where your marginal dollar gets taxed most heavily.
Connecticut Tax Brackets Explained (2026)
Connecticut has a state income tax with a top marginal rate of 6.99%. On top of federal rates (10%–37%), residents can face a combined marginal rate exceeding 35% at higher income levels. However, your effective rate is always lower than the marginal rate because only income above each threshold is taxed at that bracket's rate.
The median household in Connecticut earns $96,049/year. At that income (single filer), the federal effective rate is approximately 12–14%, bringing total income tax (federal + state) to roughly 16–19%.
How Marginal vs. Effective Rate Works
The marginal rate is the rate on your last dollar of income — it does not apply to all income. The effective rate is your total tax divided by total income. For example, someone earning $100,000 in Connecticut has a 22% federal marginal rate but an effective federal rate of roughly 15%, because the first $44,725 (2024) is taxed at 10% and 12%, not 22%.