Connecticut Income Taxes and CT State Tax Forms

efile Connecticut tax return
Connecticut
"The Constitution State"

Connecticut State Income Tax Return forms for Tax Year 2018 (Jan. 1 - Dec. 31, 2018) can be e-Filed in conjunction with an IRS Income Tax Return until October 15, 2019. In January 2020, you can e-File Tax Year 2019.

eFile.com makes it easy for you to e-file your IRS and Connecticut 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 e-file a State Tax Return. This is not an eFile.com policy but an IRS and State Agency policy. Thus, technically you cannot e-File anywhere - not just eFile.com - a Connecticut Tax Return without also e-filing the associated IRS Tax Return. But there is good news, please read on.

Detailed instructions on how you can only prepare and mail in - not eFile - a Connecticut 2018 Tax Return - here via eFile.com. However, you must download/print and sign the forms and mail them to the Tax Agency.

Function
Description
Prepare only a CT State Return
with a State Only Code: FreeFed19
Where Is Your Connecticut Tax Refund Money
Step 1: Sign into your eFile.com account and check acceptance by the Tax Agency.
Step 2: Check your Connecticut Tax Refund Status.
Where is Your IRS Refund?
Step 1: Sign into your eFile.com account and check acceptance by the IRS.
Step 2: Check your IRS Tax Refund Status.
Connecticut Income Tax Extension
Connecticut Income Tax Amendment
How to correct a rejected Tax Return
If your CT Tax Return was rejected by the CT Tax Agency - not eFile.com - instructions on how to correct a rejected Connecticut Tax Return.
How to Pay Income Taxes

 

Start Federal and Connecticut Tax Returns

 

2019 Connecticut Income Tax Filing Deadlines by Tax Year

The majority of deadlines listed here are for Tax Year 2018. Some apply to upcoming Tax Years and some are IRS or Federal deadlines.

Deadline
Type
Description
April 15, 2019
Tax Year 2018
Income Tax Return
Prepare and e-File an IRS (Due Date April 15, 2019) and Connecticut State Income Tax Return (Due Date April 15, 2019) until October 15, 2019. - eFileIT*
Expired:
April 15, 2019
2018 Income Tax Extension
October 15, 2019
Tax Year 2018
Income Tax Return after the automatic April 15, 2019 Connecticut Tax Extension
Last day to e-File a 2018 Connecticut State Income Tax Return for Tax Extension Filers and late eFilers. You can only e-File (to file by paper see below) Connecticut Income Tax Return together with an IRS Tax Return. eFileIT*
October 15, 2019 via mail-in Forms.
Forms incl. Mailing Address are listed below.
Tax Year 2018
Income Tax Return after the automatic April 15 2019 Connecticut Tax Extension
Deadline for taxpayers who got an automatic CT Tax Extension to file their Connecticut Income Tax Return by mail-in Forms - the Forms incl. mailing addresses are listed below - is Oct. 15, 2019. (Optionally, the eFileIT* deadline is Oct. 15, 2019). Instructions on how to only - without the IRS return - prepare and file a Connecticut State Income Tax Return on eFile.com.
Tax Amendment for all Tax Years
IRS Due Dates
IRS Tax Return, Extension, Amendment Deadlines
2019, 2020, etc.
Other State Tax Return, Extension, Amendment Deadlines
Select respective State Tax Return Deadlines.
2019, 2020, etc.
IRS Federal Income Tax Return, Amendment, Extension Deadlines
April 15, 2022
2018 Connecticut Income Tax Return Refund.
IRS Tax Return Refund Claim Deadline
The last day to file - you will not face late filing penalties - and claim your 2018 Connecticut Income Tax Return Refund. This deadline does not apply if you owe 2018 Income Taxes.

E-File These 2018 Connecticut State Tax Forms

Prepare and e-File 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
Determines your paycheck CT Tax Withholding amount per employer.
Step 1: Complete and submit to your employer(s).
Step 2: Estimate, Calculate your IRS Tax Withholding now.
Not filed with the State. Submit to Employer only.
Payment Voucher for Individual e-filed Returns. Complete and submit to the CT Department of Revenue - address is on the form - with your payment.
Cannot be e-Filed. Mail-in Only. 

* 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. You can however prepare all 44 State Income Tax Returns on eFile.com if you have already e-Filed or filed your IRS return. Instructions on how you can ONLY prepare and file State Income Tax Return(s). Only on eFile.com can you prepare, file or e-file unlimited State Tax Returns for one low price and not pay for each State return like you would do on H&R Block® vs. TurboTax®. Dare to Compare Now.

Automatic Connecticut Income Tax Extension

For Tax Year 2018 you can e-File an IRS Tax Extension by April 15, 2019 for free on eFile.com (instructions on whether you should consider a Tax Extension or not). Unlike the IRS, Connecticut grants all taxpayers an automatic 6-month extension (which means you do not file an extension in Connecticut) of time to file penalty free beyond the April 15, 2019 due date. The extended e-File deadline is Oct. 15, 2019 and the Connecticut paper filing due date is October 15, 2019. Keep in mind however, a Connecticut or IRS tax extension does not extend the due date to pay owed taxes or income tax liabilities penalty free.

If you owe Connecticut and/or IRS income taxes and don't pay them by Tax Day, you will be charged Connecticut and IRS late tax payment penalties. Calculate and estimate IRS late payment penalties. If you expect to owe taxes, and you are going to take advantage of the Connecticut automatic extension of time to file, you should still pay what you owe and submit an Form CT-1040V - before April 15, 2019.

Instructions on how to eFile an IRS tax extension for free on eFile.com by April 15, 2019.

The extended IRS/Connecticut eFile deadline is Oct. 15, 2019 - eFileIT* now. If you plan to file or mail-in a Connecticut tax return on paper - the Forms and Mailing Address are below - your due date is October 15, 2019.

2018 Tax Year Connecticut Tax Forms

Connecticut State Income Tax Forms for Tax Year 2018 (Jan. 1 - Dec. 31, 2018) can be e-Filed in conjunction with a IRS Income Tax Return until October 15, 2019. Details on how to only prepare and print a Connecticut 2018 Tax Return.  The CT Tax Forms and Mailing Address are below - click for the IRS Federal Income Tax Forms for Tax Year 2018.

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
Tax Amendment

2017 Tax Year Connecticut Tax Forms

Connecticut state income tax forms for Tax Year 2017 (Jan. 1 - Dec. 31, 2017)  can no longer be prepared and e-filed. Complete the respective Form(s) below, sign, and mail them to the Connecticut Department of Revenue. In addition to filing Connecticut Forms you might also have to file the 2017 IRS Tax Return Forms.

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
Tax Amendment

Connecticut Tax Facts, Information

Connecticut Tax Information and Contacts

CT Tax Type
Description

Connecticut has a state sales tax rate of 6.35% on the rental sale, lease, or rental of most goods. There is also a 7.75% 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)
Sales Tax Holiday
From August 2019

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.

  • Clothing and footwear: $100 or less
Connecticut Tax Fact
The state of Connecticut has an online list of delinquent taxpayers.
Connecticut Tax Payment Options
Connecticut State Tax Agency Contacts
For Mailing Addresses and other contact information contact the CT Dep. of Revenue

 

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