State of Connecticut Income Tax Connecticut State Income Tax
Tax Year 2023

1.1 -

QuickFact: The average family pays $800.00 in Connecticut income taxes. [1]
Rank: 38th out of 51

Connecticut Income Tax Table

Tax Bracket (Single) [2] Tax Bracket (Couple) [3] Marginal Tax Rate
$0+ $0+ 3.000%
$10,000+ $20,000+ 5.000%
$50,000+ $100,000+ 5.500%
$100,000+ $200,000+ 6.000%
$200,000+ $400,000+ 6.500%
$250,000+ $500,000+ 6.900%
$500,000+ $1,000,000+ 6.990%

Note: We don't currently have Connecticut's income tax brackets for tax year 2024. Until updated 2024 tax rates become available for Connecticut, the tax brackets shown above and used in the income tax calculator will be from tax year 2023.

Learn how marginal tax brackets work View an explanation of marginal tax brackets

Connecticut Income Tax Calculator

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How to use the Connecticut tax estimator How To Use This Calculator
You can use our free Connecticut income tax calculator to get a good estimate of what your tax liability will be come April. On the next page, you will be able to add more details like itemized deductions, tax credits, capital gains, and more.
Please remember that the income tax code is very complicated, and while we can provide a good estimate of your Federal and Connecticut income taxes, your actual tax liability may be different.

The Connecticut Income Tax

Connecticut collects a state income tax at a maximum marginal tax rate of %, spread across tax brackets. Like the Federal Income Tax, Connecticut's income tax allows couples filing jointly to pay a lower overall rate on their combined income with wider tax brackets for joint filers.

Connecticut's maximum marginal income tax rate is the 1st highest in the United States, ranking directly below Connecticut's %. You can learn more about how the Connecticut income tax compares to other states' income taxes by visiting our map of income taxes by state.

Connecticut's personal exemption incorporates a standard deduction, and is phased out for households earning over $71,000. An additional state tax credit, ranging from 75% to 0% of taxable income, is available based on your adjusted gross income.

There are 265 days left until Tax Day, on April 16th 2025. The IRS will start accepting eFiled tax returns in January 2020 - you can start your online tax return today for free with TurboTax TurboTax eFiling.

Compare the state income tax rates in Connecticut with the income tax rates in

Connecticut Tax Deductions

Income tax deductions are expenses that can be deducted from your gross pre-tax income. Using deductions is an excellent way to reduce your Connecticut income tax and maximize your refund, so be sure to research deductions that you mey be able to claim on your Federal and Connecticut tax returns. For details on specific deductions available in Connecticut, see the list of Connecticut income tax deductions.

4.1 - Connecticut Standard Deduction

What is the CT Standard Deduction for 2024? Unlike many other states, Connecticut has no standard deduction. Certain itemized deductions (including property tax, qualified charitable contributions, etc) may be allowed depending on the income level and filing type of the taxpayer. Keep in mind that not all deductions allowed on your federal income tax return are necessarily going to be allowed on your Connecticut income tax return.

4.2 - Connecticut Personal Exemptions

Connecticut has no personal exemption. The Federal Income Tax, however, does allow a personal exemption to be deducted from your gross income if you are responsible for supporting yourself financially.

4.3 - Connecticut Dependent Deduction

Unlike most states, Connecticut does not have a dependent deduction. You can, however, claim dependent deductions on your Federal Tax Return.

4.4 - Connecticut Itemized Deductions

Unlike the Federal income tax, the Connecticut income tax does not allow itemized deductions. You may claim the Connecticut standard deduction if applicable, and specific deductions may be available to Connecticut taxpayers as limited deductions or tax credits.

Connecticut Income Tax Forms provides easy access to four of the most commonly used Connecticut income tax forms, in downloadable PDF format. For all of the tax forms we provide, visit our Connecticut tax forms library or the 's tax forms page.

Free Printable Connecticut Income Tax Form CT-1040 Individual Income Tax Return
Form CT-1040 - Individual Income Tax Return
Form CT-1040 is the general Connecticut income tax return for all in-state filers.
Free Printable Connecticut Income Tax Form CT-1040ES Estimated Individual Income Tax Return
Form CT-1040ES - Estimated Individual Income Tax Return
You must pay estimated income tax if you are self employed or do not pay sufficient tax withholding. Estimated tax payments must be sent to the Department of Revenue Services of Connecticut on a quarterly basis.
Free Printable Connecticut Income Tax Form CT-1040NR PY Nonresident Income Tax Return
Form CT-1040NR PY - Nonresident Income Tax Return
CT-1040NR/PY is a special income tax return for nonresidents or part-time residents of Connecticut who file a Connecticut tax return.
Free Printable Connecticut Income Tax Tax Instruction Booklet Form CT-1040 Instruction Booklet
Tax Instruction Booklet - Form CT-1040 Instruction Booklet
If you are self employed, even part of the time, you need to file estimated quarterly taxes using form CT-140ES.
Free Printable Connecticut Tax Table
Printable Connecticut Tax Table & Tax Reference provides a printable Connecticut datasheet including an income tax table, a list of Connecticut tax deductions, important URLs and addresses, and more. This document is in PDF format.
If you are not a resident of Connecticut, have a complicated tax return, or have other specialized circumstances you may need to download additional tax forms from the website. You can find all of Connecticut's 2024 income tax forms on the income tax forms page External Link.

How To File Your Connecticut Income Tax Return

Once you've filled out your Connecticut income tax return, you have several options for filing and paying your income tax. You can mail your return to the at the correct address below, and include your payment by check or money order. You may also electronically file your Connecticut tax return through a tax preparer or using online tax software, and pay your taxes instantly using direct debit or a credit card (an additional credit card fee may apply).

Where To Send Your Connecticut Tax Return

If you filled out physical tax return forms, mail your completed Connecticut income tax return to the Connecticut no later then April 15th. Please be sure to send your completed tax forms to the correct address for your filing type.
Income Tax Returns (No Payment Included)
Department of Revenue Services
State of Connecticut
PO BOX 2976
Hartford, CT 06104-2976
Income Tax Returns (Payment Included)
Department of Revenue Services State of Connecticut
PO BOX 2977
Hartford, CT 06104-2977

e-Filing: Submit Your Connecticut Tax Return Online

You can save time and money by electronically filing your Connecticut income tax directly with the . Benefits of e-Filing your Connecticut tax return include instant submission, error checking, and faster refund response times. Most tax preparers can electronically file your return for you, or you can do it yourself using free or paid income tax software, like the examples listed below.

Connecticut's eFile program supports most third-party tax software packages, and accepts all income tax return types through the eFile program. In addition to the convenience of electronically filing, Connecticut promises expedited income tax refunds to filers who take advantage of the eFile program.

To e-file your Connecticut and Federal income tax returns, you need a piece of tax software that is certified for eFile by the IRS. While most in-depth tax software charges a fee, there are several free options available through the states, and simple versions are also offered free of charge by most tax software companies.

The two most popular tax software packages are H&R Block At Home, sold by the H&R Block tax preparation company, and TurboTax Federal & State, sold by the Intuit software company. Both companies produce multiple editions for simple to very complex tax returns, so be sure to carefully compare the features offered by each package.

Getting Your Connecticut Tax Refund

Your Connecticut Income Tax Refund Online

If your state tax witholdings are greater then the amount of income tax you owe the state of Connecticut, you will receive an income tax refund check from the government to make up the difference.

It should take one to three weeks for your refund check to be processed after your income tax return is recieved. E-filing your return and filing early can help ensure your refund check gets sent as quickly as possible.

Once you've filed your tax return, all you have to do is wait for your refund to arrive. If you want to check the status of your Connecticut tax refund, you can visit the Connecticut Income Tax Refund page.


  1. Our state ranking and income tax figures are based on a family of four (married parents with two children) earning the national median household income of $50,000 per year. Deductions and personal exemptions are taken into account, but some state-specific deductions and tax credit programs may not be accounted for.
  2. Before the official 2024 Connecticut income tax rates are released, provisional 2024 tax rates are based on Connecticut's 2023 income tax brackets.
  3. The 2024 state personal income tax brackets are updated from the Connecticut and Tax FoundationExternal Link data.
  4. Connecticut tax forms are sourced from the Connecticut income tax forms pageExternal Link, and are updated on a yearly basis. Please make sure the Connecticut forms you are using are up-to-date.