2017 Individual Income Tax Forms
Instruction Booklets
| Name | Description | Revised Date |
| CT-1040 | 2017 Connecticut Resident Income Tax Instruction Booklet | 12/2017 |
| CT-1040NR/PY | 2017 Nonresident/Part-Year Resident Tax Instruction Booklet | 12/2017 |
Forms & Instructions
| Name | Description | Revised Date |
| CT-1040 | 2017 Resident Income Tax Return | 12/2017 |
Part-Year/Nonresident Forms
| CT-1040NR/PY | 2017 Nonresident/Part-Year Resident Tax Return | 12/2017 |
| Schedule CT-SI |
Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources | 12/2017 |
| CT-1040 AW | Part-Year Resident Income Allocation Worksheet | 12/2017 |
EITC Forms
| Schedule CT-IT Credit |
Income Tax Credit Summary | 12/2017 |
| Schedule CT-EITC | 2017 Connecticut Earned Income Tax Credit | 12/2017 |
Other Forms & Schedules
| CT-1040BA | Nonresident Business Apportionment Schedule | 12/2017 |
| CT-1040CRC | Claim of Right Credit | 12/2017 |
| Schedule CT-CHET |
2017 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution |
12/2017 |
| CT-1040EFW | Connecticut Electronic Withdrawal Payment Record |
12/2017 |
| CT-1040ES | 2018 Estimated Connecticut Income Tax Payment Coupon for Individuals | 12/2017 |
| CT-1040V | Connecticut Electronic Filing Payment Voucher | 12/2017 |
| Schedule CT-1040WH |
Connecticut Income Tax Withholding Supplemental Schedule | 12/2017 |
| CT-1040X | Amended Income Tax Return for Individuals | 12/2017 |
| CT-1127 | Application for Extension of Time for Payment of Income Tax | 12/2017 |
| CT-19 IT | Title 19 Status Release Form | 12/2017 |
| CT-2210 | Underpayment of Estimated Income Tax by Individuals, Trusts and Estates (Schedules A & B) | 12/2017 |
| CT-3911 | Taxpayer Statement Regarding Refund - Use this form to report a lost, stolen or missing refund check | 12/2017 |
| CT-4852 | Substitute for Forms W-2 and 1099-R | 12/2017 |
| CT-6251 | Connecticut Alternative Minimum Tax Return | 12/2017 |
| CT-8379 | Nonobligated Spouse Claim | 12/2017 |
| CT-8801 | Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts and Estates | 12/2017 |
| CT-8857 | Request for Innocent Spouse Relief | 12/2017 |
| CT-IRF | Insurance Reinvestment Fund Credit | 12/2017 |
| OP-186 | Individual Use Tax Return | 12/2017 |
| 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 |
| 2017 Tax Tables to $500K | 12/2017 | |
| 2017 Tax Tables to $102K | 12/2017 | |
| Calculation Schedule | Use this schedule to calculate the tax if your a.g.i is over $102,000 | 12/2017 |
| Income Tax Calculator | Use this calculator to determine your tax liability, regardless of your a.g.i. | 12/2017 |
| Property Tax Calculator |
Use this calculator to determine the amount of your property tax credit | 12/2017 |
| Social Security Benefits | Use this calculator to determine your Social Security Benefit Adjustment | 12/2017 |