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Individual Income Tax Forms

File Your 2020 Connecticut Income Tax Return Online!

There are free, online state income tax filing options available to you, including the DRS Taxpayer Service Center.

Benefits to electronic filing include:

  • Simple, secure, and can be completed from the comfort of your home.
  • Can reduce return errors.
  • Results in an immediate confirmation that your submission has been received by DRS.
  • If you are expecting a refund, electronic filing is the quickest way to receive the refund.

Please consider an electronic option to file your state income tax return this year. Thank you!

Instruction Booklets

Name Description Revised Date Due Date

CT-1040 Taxpayer Alert

2020 Connecticut Resident Income Tax Instruction Booklet 02/2021 N/A
CT-1040NR/PY Taxpayer Alert 2020 Nonresident/Part-Year Resident Tax Instruction Booklet 03/2021 N/A

Resident Form

Name

Description Revised Date Due Date
CT-1040 2020 Resident Income Tax Return 02/2021 04/15/2021

Part-Year/Nonresident Forms

Name Description Revised Date Due Date
 CT-1040NR/PY  2020 Nonresident/Part-Year Resident Tax Return 02/2021 04/15/2021 
 Schedule CT-SI  Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources 12/2020 04/15/2021
 Schedule CT-1040 AW  Part-Year Resident Income Allocation 12/2020 04/15/2021

EITC Forms

Schedule CT-EITC 2020 Connecticut Earned Income Tax Credit 01/2021 04/15/2021

Other Forms & Schedules

CT-CWPI Request for Waiver of 2018 Penalty and Interest Due to the Enactment of the Pass-Through Entity Tax (Individuals, Trusts and Estates only) 2019
CT-1040 EXT Application for Extension of Time to File Connecticut Income Tax Return for Individuals 12/2020
Schedule CT-BIO Bioscience Worksheet 12/2020
Schedule CT-PE Pass-Through Entity Tax Credit 12/2020
Schedule
CT-IT Credit
Income Tax Credit Summary 12/2020
CT-1040BA Nonresident Business Apportionment Schedule 12/2020
CT-1040CRC Claim of Right Credit 12/2020
Schedule
CT-CHET
 - Taxpayer Alert
2020 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution
03/2021
CT-1040EFW Connecticut Electronic Withdrawal Payment Record
12/2020
CT-1040ES 2020 Estimated Connecticut Income Tax Payment Coupon for Individuals 01/2020
CT-1040ES 2021 Estimated Connecticut Income Tax Payment Coupon for Individuals 01/2021
CT-1040V Connecticut Electronic Filing Payment Voucher 12/2020
Schedule
CT-1040WH

Connecticut Income Tax Withholding Supplemental Schedule 12/2020
CT-1040X Amended Income Tax Return for Individuals 12/2020
CT-1127 Application for Extension of Time for Payment of Income Tax 12/2020
CT-19 IT Title 19 Status Release Form 12/2020
CT-2210 Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates 12/2020
CT-3911 Taxpayer Statement Regarding Refund -Use this form to report a lost, stolen or missing refund check 12/2016
CT-4852 Substitute for Forms W-2 and 1099-R
CT-6251 Connecticut Alternative Minimum Tax Return 12/2020
CT-8379 Nonobligated Spouse Claim 12/2020
CT-8801 Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and Estates 12/2020
CT-8822 Change of Address 2010
CT-8857 Request for Innocent Spouse Relief
CT-IRF Insurance Reinvestment Fund Credit
OP-186 Individual Use Tax Return
CT-12-717A Change of Resident Status - Special Accruals Connecticut Surety Bond Form 2017
CT-12-717B Change of Resident Status - Special Accruals Other Acceptable Security Form 2017
CT-12-717A&B Forms CT-12-717 A and CT-12-717 B Instructions 2017

Tax Tables & Calculators

Name Description Revised Date
2020 Tax Tables to $500K
12/2020
2020 Tax Tables to $102K 12/2020
Calculation Schedule Use this schedule to calculate the tax if your a.g.i is over $102,000 12/2020
Income Tax Calculator Use this calculator to determine your tax liability, regardless of your a.g.i.
Property Tax Calculator
Use this calculator to determine the amount of your property tax credit
Social Security Benefits Use this calculator to determine your Social Security Benefit Adjustment