Overview

Connecticut uses progressive rates from 3% to 6.99%. Understanding how Connecticut’s tax system works helps you accurately predict your paycheck and plan your finances throughout the year.

2025 Tax Rates

Connecticut uses a progressive income tax structure. Lower income is taxed at lower rates (starting at 3%), and higher income is taxed at higher rates (up to 6.99%). Only the income in each bracket is taxed at that bracket’s rate — not your entire income.

Standard Deduction

Connecticut provides a state standard deduction of $15,000 for single filers and $24,000 for married filing jointly. This amount is subtracted from gross income before your state tax rate is applied, lowering your overall state tax burden.

Who Must File in Connecticut?

Generally, any resident of Connecticut who earns income above the filing threshold must file a state income tax return. The Connecticut Department of Revenue sets annual filing thresholds, which roughly correspond to the standard deduction amounts.

How Connecticut Tax Affects Your Paycheck

Your employer withholds Connecticut state income tax from each paycheck based on your W-4 equivalent form and expected annual income. On a $75,000 annual salary, a single filer in Connecticut can expect to pay approximately $2,547–$4,194 in state income taxes annually.

Tips to Reduce Your Connecticut State Tax Bill

  • Contribute to a pre-tax 401(k) — reduces both your federal and state taxable income
  • Maximize HSA and FSA contributions if available through your employer
  • Claim all applicable deductions — Connecticut may allow deductions beyond the standard deduction
  • Review your withholding each year to avoid underpayment penalties

Filing Deadlines

Connecticut’s state income tax return is generally due on April 15, aligning with the federal deadline. An automatic extension to October 15 is usually available, but any tax owed must still be paid by April 15 to avoid penalties.

How Connecticut Compares to Neighboring States

Connecticut borders New York, Massachusetts, Rhode Island. Compared to its neighbors, Connecticut’s top rate of 6.99% places it in the middle of the pack for states in the region.

Use Our Calculator

Want to see your exact Connecticut take-home pay? Use our free US Paycheck Calculator — select Connecticut from the state dropdown and enter your salary, filing status, and dependents for a complete tax breakdown.

Tax rates based on 2025 data. Laws change frequently — verify with the Connecticut Department of Revenue or a tax professional.