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Connecticut Income Taxes and CT State Tax Forms

efile Connecticut tax return
Connecticut
"The Constitution State"

Start Federal and Connecticut Tax Returns

Your Connecticut Income Tax Return

Efile.com makes it easy for you to e-file your state tax return (e.g resident, nonresident, or part-year resident returns). However, the IRS and the respective state tax agencies require you to e-file a federal income tax return at the same time you efile a state tax return. This is not an efile.com policy but an IRS and state agency policy. Many taxpayers have asked how they can only prepare and file a state income tax return. The efile.com tax application lets you prepare a state tax return only, however you cannot efile the state return upon completion. Instead, you will have to download the completed state tax return as a PDF file, print it, sign it, and mail it to the respective state - the address is on the PDF file. Find more detailed instructions on how to prepare and file a state only return on efile.com.

2018 Connecticut Income Tax Filing Deadlines

Deadline
Type of Filing
Description
April 15, 2019
Tax Return - efileIT*
Connecticut State Income Tax Return Due Date.
April 15, 2019
Tax Extension
Connecticut Automatic Extension. Details below.
October 15, 2019
Tax Return - efileIT*
Last day to efile a 2018 Connecticut State Income Tax Return for tax extension filers and late efilers.
Now
Requires an accepted 2018 or previous year Connecticut State Tax Return.
State Tax Returns
Select respective State Tax Return Deadlines.
Federal Tax Returns
IRS Tax Return Deadlines.
 

E-File These 2018 Connecticut State Tax Forms

Prepare and efile these state forms for 2018 in conjunction with your federal and state income tax return. As you proceed through the tax interview on efile.com, the application will select the correct state forms for you. You can also select tax forms individually. All these forms will then be e-filed by you to the state tax agency. Instructions on how to only prepare a state income tax return.

Form/Schedule
Description
efileIT Now*
Form CT-1040
Resident Income Tax Return
Form CT-1040ES
Estimated Connecticut Income Tax Payment Coupon for Individuals
Form CT-1040NR/PY
Nonresident/Part-Year Resident Tax Return
Form CT-1040V
Electronic Filing Payment Voucher
Form CT-2210
Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates
Form CT-6251
Alternative Minimum Tax Return
Form CT-8822
Change of Address
Form CT-8857
Request for Innocent Spouse Relief
Form OP-186
Connecticut Individual Use Tax Return
Schedule CT-1040WH
Connecticut Income Tax Withholding Supplemental Schedule
Schedule CT-EITC
Connecticut Earned Income Tax Credit
Employee's Withholding Certificate
Cannot be efiled


* Due to IRS and state tax agency tax data sharing and validation requirements, you can only e-file a state income tax return while also e-filing a federal income tax return. This is not an efile.com created policy, but all online tax web sites have to adhere to this IRS/state issued tax data sharing policy. Find out how to only prepare and file a state tax return. Only on efile.com can you prepare and efile unlimited state tax returns for one low price. Most other sites charge a per state price.

Connecticut efile Error Codes

If your Connecticut state return was rejected by the state and not efile.com, you will receive an error reject code. If you prepared and efiled your return on efile.com, we will provide you with an explanation of how to correct the error on your return. You may then resubmit your state return at no additional charge until it is accepted by the state. View a list of all Connecticut State efile Income Tax Return Error Reject Codes.

How To File a Connecticut Tax Extension

If you are certain that you cannot file your Connecticut return by the deadline, you do not need to file for an extension. You will automatically receive a 6-month extension of time to file your return (not to pay). The extended tax return due date is October 15, 2019. Please be aware that Connecticut will not accept the federal extension form as an extension for your Connecticut tax return. However, if you expect to owe income taxes, you should submit your payment with payment voucher CT-1040 EXT. If you efiled your return and are making a payment by check or money order, you must complete a CT-1040 EXT on efile.com. If you are making a payment by credit card, a CT-1040 EXT is not needed. If you are making an automatic extension payment, you also must use CT-1040 EXT unless it is made electronically. Use efile.com and prepare a Connecticut tax return to find out what your Connecticut state income tax payment will be.

Important: Do you need to prepare and e-file an IRS or federal tax extension as well?

How to File A Connecticut Tax Amendment

Amended Connecticut tax returns can only be mailed; they cannot be efiled. Learn how to file a Connecticut tax amendment.

Important Reminder! If you are filing a Connecticut tax amendment, you may need to file a federal tax amendment as well.

2017 Tax Year Connecticut Tax Forms

Connecticut state tax forms for previous Tax Years cannot be prepared and e-filed during the current tax season. You will need to print, fill out, and mail the forms to the Connecticut Department of Revenue.

Form/Schedule
Description
Resident Income Tax Return
Estimated Connecticut Income Tax Payment Coupon for Individuals
Nonresident/Part-Year Resident Tax Return
Electronic Filing Payment Voucher
Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates
Alternative Minimum Tax Return
Change of Address
Request for Innocent Spouse Relief
Connecticut Individual Use Tax Return
Connecticut Income Tax Withholding Supplemental Schedule
Connecticut Earned Income Tax Credit
 

2016 Tax Year Connecticut Tax Forms

Connecticut state tax forms for previous Tax Years cannot be prepared and e-filed during the current tax season. You will need to print, fill out, and mail the forms to the Connecticut Department of Revenue.

Form/Schedule
Description
Resident Income Tax Return
Estimated Connecticut Income Tax Payment Coupon for Individuals
Nonresident/Part-Year Resident Tax Return
Electronic Filing Payment Voucher
Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates
Alternative Minimum Tax Return
Change of Address
Request for Innocent Spouse Relief
Connecticut Individual Use Tax Return
Connecticut Income Tax Withholding Supplemental Schedule
Connecticut Earned Income Tax Credit
 

Connecticut Tax Facts

CT Income Tax

Individual income is taxed across six tax brackets at six graduated tax rates:

  • 3% for the first $10,000 of taxable income
  • 5% for taxable income between $10,001 and $50,000
  • 5.5% for taxable income between $50,001 and $100,000
  • 6% for taxable income between $100,001 and $200,000
  • 6.5.% for taxable income between $200,001 and $250,000
  • 6.9% for taxable income $250,001 and $500,000
  • 6.99% for taxable income above $500,000

CT Sales Tax

Connecticut has a state sales tax rate of 6.35% on the rental sale, lease, or rental of most goods. There is also a 7% luxury sales tax for the following purchases:

  • Most motor vehicles costing more than $50,000
  • Boats costing more than $100,000
  • Jewelry (real & imitation) costing more than $5,000
  • Apparel & footwear costing more than $1,000 (also applies to handbags, luggage, umbrellas, wallets, or watches costing more than $1,000)

More information on Connecticut Sales Tax

CT Sales Tax Holiday

Connecticut has an annual one-week sales and use tax holiday. It usually occurs on the third week of August (from Sunday through Saturday). Certain items are exempt from Connecticut sales tax. However, the CT consumer will only receive the tax exemption if a specific total spending limit is met.

Refer to the chart below for Connecticut sales tax holidays for 2019. We will update it when the dates are available. 

Sales Tax Holiday
Sales Tax Holiday Items Included
August 2019
  • Clothing and footwear: $100 or less

CT Personal Property Tax

All personal property located within the state of Connecticut is taxable unless a statute specially exempts it. The tax varies based on each city and town in the state.

Odd Connecticut Tax Fact

The state of Connecticut has an online list of delinquent taxpayers.

Connecticut State Tax Agency Contacts

You can contact the Connecticut Department of Revenue at 860-297-5962.

For more information on Connecticut state income taxes, you can visit the website of The Connecticut Department of Revenue.

See other U.S. States, Territories, and Protectorates