Connecticut uses graduated (progressive) state income tax brackets in 2026, so the rate rises with income much like the federal system. This calculator applies an estimated effective rate of about 5.0% for a middle income — on a $75,000 salary a single filer pays roughly $3,750 in state tax and nets about $57,843 a year (77.1% of gross). Your exact rate depends on where your income lands across the brackets.

Because Connecticut is a graduated-rate state, your top marginal rate is higher than your effective rate — you only pay the top rate on income above each threshold, not on your whole salary. Use the interactive calculator below and adjust the state-rate field to match your income for a precise figure. The 5.0% estimate here is above the 4.8% average across taxing states.

Remember that FICA is separate from income tax and is not affected by your state. Every worker pays 6.2% for Social Security on the first $184,500 of wages (the 2026 wage base) plus 1.45% for Medicare on all wages. Pre-tax 401(k) and HSA contributions lower your federal and state income tax but do not reduce FICA — a detail that trips up a lot of first-time budgeters.

Connecticut layers a Paid Leave payroll deduction (0.5% of wages) on top of its graduated income tax, so your pay stub shows both. The state passed meaningful middle-class rate cuts effective 2024 — the first broad income tax reduction in decades — which lowered the rates on the first tiers of income. Connecticut also has some of the highest property taxes in the country, so total tax burden depends heavily on whether you rent or own.