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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 2017 Resident Income Tax Return 12/2017 04/15/2018

Part-Year/Nonresident Forms

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

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 & Schedules

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-1040V Connecticut Electronic Filing Payment Voucher 12/2017 04/15/18
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  12/2017 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  12/2017 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 12/2017
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

Tax Tables & Calculators

Name Description Revised Date Due Date
2017 Tax Tables to $500K     12/2017  N/A
2017 Tax Tables to $102K    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  N/A