Individual Income Tax Forms

Instruction Booklets

Name Description Revised Date Due Date
CT-1040 2018 Connecticut Resident Income Tax Instruction Booklet 12/2018 N/A
CT-1040NR/PY 2018 Nonresident/Part-Year Resident Tax Instruction Booklet 12/2018 N/A

Resident Form

Name

Description Revised Date Due Date
CT-1040 2018 Resident Income Tax Return 12/2018 04/15/2019

Part-Year/Nonresident Forms

CT-1040NR/PY 2018 Nonresident/Part-Year Resident Tax Return 12/2018 04/15/2019
Schedule
CT-SI
Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources 12/2018
04/15/2019
CT-1040 AW Part-Year Resident Income Allocation Worksheet 12/2018
04/15/2019

EITC Forms

Schedule CT-EITC 2018 Connecticut Earned Income Tax Credit 12/2018 04/15/2019

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) 08/2019
CT-1040 EXT Application for Extension of Time to File Connecticut Income Tax Return for Individuals 12/2018
Schedule CT-BIO Bioscience Worksheet  12/2018
Schedule CT-PE Pass-Through Entity Tax Credit 12/2018 
Schedule
CT-IT Credit
Income Tax Credit Summary 12/2018
CT-1040BA Nonresident Business Apportionment Schedule 12/2018
CT-1040CRC Claim of Right Credit 12/2018
Schedule
CT-CHET

2018 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution
12/2018
CT-1040EFW Connecticut Electronic Withdrawal Payment Record
12/2018
CT-1040ES 2019 Estimated Connecticut Income Tax Payment Coupon for Individuals 12/2018
CT-1040ES 2018 Estimated Connecticut Income Tax Payment Coupon for Individuals 12/2017
CT-1040V Connecticut Electronic Filing Payment Voucher 12/2018
Schedule
CT-1040WH

Connecticut Income Tax Withholding Supplemental Schedule 12/2018
CT-1040X Amended Income Tax Return for Individuals 12/2018
CT-1127 Application for Extension of Time for Payment of Income Tax 12/2018
CT-19 IT Title 19 Status Release Form 12/2018
CT-2210 Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates 12/2018
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 12/2018
CT-6251 Connecticut Alternative Minimum Tax Return  02/2019
CT-8379 Nonobligated Spouse Claim 12/2018
CT-8801 Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and Estates 12/2018
CT-8822 Change of Address 2010
CT-8857 Request for Innocent Spouse Relief 12/2018
CT-IRF Insurance Reinvestment Fund Credit 12/2018
OP-186 Individual Use Tax Return 12/2018
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

Name Description Revised Date
2018 Tax Tables to $500K
12/2018
2018 Tax Tables to $102K 12/2018
Calculation Schedule Use this schedule to calculate the tax if your a.g.i is over $102,000 12/2018
Income Tax Calculator Use this calculator to determine your tax liability, regardless of your a.g.i. 12/2018
Property Tax Calculator
Use this calculator to determine the amount of your property tax credit 12/2018
Social Security Benefits Use this calculator to determine your Social Security Benefit Adjustment  12/2018