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Individual Income Tax Forms

Instruction Booklets

Name  Description  Revised Date Due Date 
CT-1040  2017 Connecticut Resident Income Tax Instruction Booklet  12/2017 N/A
CT-1040NR/PY  2017 Nonresident/Part-Year Resident Tax Instruction Booklet  12/2017  N/A 

Forms & Instructions

Name Description Revised Date Due Date
CT-1040 2017Resident Income Tax Return  12/2017  04/15/2018 
Part-Year/Non-Resident Forms
Name  Description Revised date Due Date
CT-1040NR/PY  2017 Nonresident/Part-Year Resident Tax Return  12/2017  04/15/2018 
Schedule CT-SI  Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources  12/2017  04/15/2018 
CT-1040 AW  Part-Year Resident Income Allocation Worksheet  12/2017  04/15/2018 
EITC Forms
Name  Description Revised Date Due Date
Schedule CT-IT Credit  Income Tax Credit Summary  12/2017  04/15/2018 
Schedule CT-EITC  2017 Connecticut Earned Income Tax Credit  12/2017  04/15/2018 
Other Forms and Schedules
Name  Description  Revised Date  Due Date 
CT-1040BA  Nonresident Business Apportionment Schedule  12/2017  N/A 
CT-1040CRC  Claim of Right Credit  12/2017  N/A 
Schedule CT-CHET  2017 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution  12/2017  N/A 
CT-1040EFW  Connecticut Electronic Withdrawal Payment Record  12/2017  N/A 
CT-1040ES  2018 Estimated Connecticut Income Tax Payment Coupon for Individuals  12/2017  Varies
CT-1040ES  2017 Estimated Connecticut Income Tax Payment Coupon for Individuals 12/2016  Varies
CT-1040 EXT 2017 Application for Extension of Time to File Income Tax Return for Individuals 12/2017 04/15/2018
CT-1040V Connecticut Electronic Filing Payment Voucher  12/2017  N/A
Schedule CT-1040WH Connecticut Income Tax Withholding Supplemental Schedule  12/2017  N/A
CT-1040X Amended Income Tax Return for Individuals  12/2017  N/A
CT-1127 Application for Extension of Time for Payment of Income Tax  12/2017  N/A 
CT-19 IT  Title 19 Status Release Form  12/2017  N/A 
CT-2210  Underpayment of Estimated Income Tax by Individuals, Trusts and Estates (Schedules A & B)  12/2017 N/A 
CT-3911  Taxpayer Statement Regarding Refund - Use this form to report a lost, stolen or missing refund check  07/2016  N/A 
CT-4852  Substitute for Forms W-2 and 1099-R  12/2017  N/A 
CT-6251  Connecticut Alternative Minimum Tax Return 12/2017  N/A 
CT-8379  Nonobligated Spouse Claim 12/2017  N/A 
CT-8801  Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts and Estates 12/2017  N/A 
CT-8822  Change of Address for Individuals 12/2010  N/A 
CT-8857  Request for Innocent Spouse Relief 12/2017  N/A 
CT-IRF  Insurance Reinvestment Fund Credit 12/2017  N/A 
OP-186  Individual Use Tax Return 07/2018  N/A 
CT-12-717A  Change of Resident Status - Special Accruals Connecticut Surety Bond Form 2017  N/A 
CT-12-717B  Change of Resident Status - Special Accruals Other Acceptable Security Form  2017  N/A 
CT-12-717A&B  Forms CT-12-717 A and CT-12-717 B Instructions  2017  N/A
CT-AIT  Angel Investor Tax Credit  02/2017  N/A 

Tax Tables and Calculators

Name  Description Revised Date Due Date 
2017 Tax Tables to $500K  2017 Tax Tables up to $500,000 12/2017  N/A 
2017 Tax Tables to $102K  2017 Tax Tables up to $102,000 12/2017  N/A 
Calculation Schedule Use this schedule to calculate the tax if your a.g.i is over $102,000  12/2017  N/A 
Income Tax Calculator Use this calculator to determine your tax liability, regardless of your a.g.i.  12/2017  N/A 
Property Tax Calculator Use this calculator to determine the amount of your property tax credit  12/2017  N/A 
Social Security Benefits Use this calculator to determine your Social Security Benefit Adjustment  12/2017