Prior Year's Income Tax Forms

File Your 2023 Connecticut Income Tax Return Online!

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!


Name Description Revised Date
CT-1040 2023 Connecticut Resident Income Tax Return Instructions 12/2023
CT-1040NR/PY 2023 Connecticut Nonresident and Part-Year Resident Income Tax Return Instructions  12/2023

Resident Form
Name Description Revised Date
CT-1040 2023 Resident Income Tax Return 12/2023

Part-Year/Nonresident Forms

Name Description Revised Date
CT-1040NR/PY 2023 Nonresident/Part-Year Resident Tax Return 12/2023
Schedule CT-SI Nonresident or Part-Year Resident Schedule of Income from Connecticut Sources 12/2023
Schedule CT-1040 AW Part-Year Resident Income Allocation 12/2023

EITC Forms

Schedule CT-EITC 2023 Connecticut Earned Income Tax Credit 12/2023
APL-505 Taxpayer's Earned Income Tax Credit Protest NEW

Other Forms & Schedules

CT-1040 EXT Application for Extension of Time to File Connecticut Income Tax Return for Individuals 12/2023
Schedule CT-Dependent CT Resident Dependent Information 12/2023
Schedule CT-BIO Bioscience Worksheet 12/2023
Schedule CT-PE Pass-Through Entity Tax Credit 12/2023
CT-IT Credit
Income Tax Credit Summary 12/2023
CT-1040BA Nonresident Business Apportionment Schedule 12/2023
CT-1040CRC Claim of Right Credit 12/2023
2023 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution 12/2023
CT-1040EFW Connecticut Electronic Withdrawal Payment Record 12/2022 
CT-1040ES 2024 Estimated Connecticut Income Tax Payment Coupon for Individuals 12/2023
CT-1040V Connecticut Electronic Filing Payment Voucher 12/2023
Connecticut Income Tax Withholding Supplemental Schedule 12/2023
CT-1040X Amended Income Tax Return for Individuals 12/2023
CT-1127 Application for Extension of Time for Payment of Income Tax 12/2023
CT-19 IT Title 19 Status Release Form 12/2023
CT-2210 Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates 12/2023
CT-3911 Taxpayer Statement Regarding Refund -Use this form to report a lost, stolen or missing refund check 12/2023
CT-4852 Substitute for Forms W-2 and 1099-R 12/2023
CT-6251 Connecticut Alternative Minimum Tax Return 12/2023
CT-8379 Nonobligated Spouse Claim 12/2023
CT-8801 Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and Estates 12/2023
CT-8857 Request for Innocent Spouse Relief 12/2023
CT-IRF Insurance Reinvestment Fund Credit 12/2023
OP-186 Individual Use Tax Return  2018
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