The phase-out spike
CT phases out its 3% bracket benefit and personal exemption between roughly $50K and $105K (single). The result: marginal rates in that band run higher than the printed 5.5% — a raise can face ~6.3%+ effective state marginal.
Fairfield County NYC commuters
CT residents working in NYC pay NY non-resident tax first, then CT with a credit — netting roughly CT's rate. But they avoid NYC's 3.876% city tax only if they never live in the city. Stamford/Greenwich salaries often carry NYC-level gross with CT-level tax.
Property tax is the real bill
CT effective property-tax rates average ~1.8–2.1% with no cap. A $600K Fairfield County home carries $12K+/yr in property tax — often exceeding the state income-tax bill for middle earners.
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Read the guideFAQ
What is Connecticut's top income tax rate?
6.99% on income over $500K (single). Most professionals fall in the 4.5%–5.5% brackets, though phase-outs raise the effective marginal rate.
Does CT have a standard deduction?
No. CT offers a personal exemption that phases out at moderate incomes, but no standard deduction like the federal one.
Does CT tax Social Security?
Mostly no — Social Security is fully exempt for single filers under ~$75K AGI and joint filers under ~$100K, with partial exemptions above.
For a city-specific version of this, see the NYC paycheck calculator.
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