Standard Deduction in Connecticut
Connecticut (CT) does not publish a conventional state standard deduction for tax year 2025. It instead uses personal exemptions, an exemption credit, or conformity to federal taxable income. The federal standard deduction ($15,000 single, $30,000 married) still applies on your federal return.
2025 Standard Deduction in Connecticut
| Filing Status | Standard Deduction |
|---|---|
| Single | N/A |
| Married Filing Jointly | N/A |
| Federal (for comparison) | $15,000 / $30,000 |
How the Connecticut Standard Deduction Works
Connecticut does not publish a conventional state standard deduction for 2025. The federal standard deduction ($15,000 single, $30,000 married filing jointly) still applies on your federal return, but Connecticut's state calculation uses a different mechanism — typically a personal exemption, an exemption credit, or conformity to federal taxable income. Check the Connecticut Department of Revenue instructions for the figure that applies to your filing status.
Connecticut does not provide a state-level standard deduction in the way most states do. Some states instead use personal exemptions, exemption credits, or conformity to the federal taxable-income figure. Check the state revenue department's instructions for Connecticut for the specific mechanism that applies to your filing status.
The standard deduction is the amount you can subtract from gross income without itemizing. In Connecticut, it is claimed before Connecticut's bracket rates apply, which is why a larger deduction directly lowers the income that gets taxed. To see the dollar effect on a specific income, run the figure through the income tax calculator.
What This Page Cannot Tell You
The standard-deduction figures above describe the statutory state-level rules. Your actual state tax liability depends on credits (earned-income credit, child credit, dependent credit), itemized deductions, retirement-income exclusions, local-government taxes (city or county income tax in some states), and federal taxable-income conformity rules. None of those interactions are computed here.
This page is informational and is not tax advice. For filing decisions, consult a qualified tax professional and the official IRS publications and Connecticut Department of Revenue instructions for tax year 2025. The Tax Foundation publishes annual state-tax-burden comparisons at taxfoundation.org if you want a national context for the Connecticut numbers above.
Frequently Asked Questions
What is the Connecticut standard deduction for 2025?
Connecticut (CT) does not publish a conventional state standard deduction for tax year 2025. It instead uses personal exemptions, an exemption credit, or conformity to federal taxable income. The federal standard deduction ($15,000 single, $30,000 married) still applies on your federal return.
Is the Connecticut standard deduction different for single and married filers?
Connecticut does not use a conventional standard deduction, so there is no single-versus-married deduction figure to compare. The state uses exemptions or federal conformity instead; check the Connecticut Department of Revenue instructions for the amounts tied to your filing status.
How does the Connecticut standard deduction compare to the federal one?
Connecticut does not publish a conventional state standard deduction for 2025. The federal standard deduction ($15,000 single, $30,000 married filing jointly) still applies on your federal return, but Connecticut's state calculation uses a different mechanism — typically a personal exemption, an exemption credit, or conformity to federal taxable income. Check the Connecticut Department of Revenue instructions for the figure that applies to your filing status.
Should I take the standard deduction or itemize in Connecticut?
Take whichever is larger. The standard deduction in Connecticut is the floor; itemizing makes sense only when your eligible itemized deductions exceed that floor. Many states require you to use the same method (standard or itemized) on the state return as on the federal return, so confirm Connecticut's conformity rule before choosing.
Where does this standard deduction figure come from?
The Connecticut standard deduction shown here is compiled from official state tax authority publications and the Tax Foundation's annual state tax data, for tax year 2025 (last refreshed April 2026). Federal standard-deduction figures are from the IRS Revenue Procedures. State legislatures occasionally adjust these amounts; verify against the official Connecticut Department of Revenue instructions before filing. This page is informational and not tax advice.