Individual Income Tax Forms
Instruction Booklets
| Name | Description | Revised Date | Due Date |
|
CT-1040 Taxpayer Alert |
2020 Connecticut Resident Income Tax Instruction Booklet | 02/2021 | N/A |
| CT-1040NR/PY Taxpayer Alert | 2020 Nonresident/Part-Year Resident Tax Instruction Booklet | 03/2021 | N/A |
Resident Form
|
Name |
Description | Revised Date | Due Date |
| CT-1040 | 2020 Resident Income Tax Return | 02/2021 | 04/15/2021 |
Part-Year/Nonresident Forms
| Name | Description | Revised Date | Due Date |
| CT-1040NR/PY | 2020 Nonresident/Part-Year Resident Tax Return | 02/2021 | 04/15/2021 |
| Schedule CT-SI | Nonresident or Part-Year Resident Schedule of Income From Connecticut Sources | 12/2020 | 04/15/2021 |
| Schedule CT-1040 AW | Part-Year Resident Income Allocation | 12/2020 | 04/15/2021 |
EITC Forms
| Schedule CT-EITC | 2020 Connecticut Earned Income Tax Credit | 01/2021 | 04/15/2021 |
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) | 2019 |
| CT-1040 EXT | Application for Extension of Time to File Connecticut Income Tax Return for Individuals | 12/2020 |
| Schedule CT-BIO | Bioscience Worksheet | 12/2020 |
| Schedule CT-PE | Pass-Through Entity Tax Credit | 12/2020 |
| Schedule CT-IT Credit |
Income Tax Credit Summary | 12/2020 |
| CT-1040BA | Nonresident Business Apportionment Schedule | 12/2020 |
| CT-1040CRC | Claim of Right Credit | 12/2020 |
| Schedule CT-CHET - Taxpayer Alert |
2020 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution |
03/2021 |
| CT-1040EFW | Connecticut Electronic Withdrawal Payment Record |
12/2020 |
| CT-1040ES | 2020 Estimated Connecticut Income Tax Payment Coupon for Individuals | 01/2020 |
| CT-1040ES | 2021 Estimated Connecticut Income Tax Payment Coupon for Individuals | 01/2021 |
| CT-1040V | Connecticut Electronic Filing Payment Voucher | 12/2020 |
| Schedule CT-1040WH |
Connecticut Income Tax Withholding Supplemental Schedule | 12/2020 |
| CT-1040X | Amended Income Tax Return for Individuals | 12/2020 |
| CT-1127 | Application for Extension of Time for Payment of Income Tax | 12/2020 |
| CT-19 IT | Title 19 Status Release Form | 12/2020 |
| CT-2210 | Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates | 12/2020 |
| 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 | |
| CT-6251 | Connecticut Alternative Minimum Tax Return | 12/2020 |
| CT-8379 | Nonobligated Spouse Claim | 12/2020 |
| CT-8801 | Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and Estates | 12/2020 |
| CT-8857 | Request for Innocent Spouse Relief | |
| CT-IRF | Insurance Reinvestment Fund Credit | |
| OP-186 | Individual Use Tax Return | |
| 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 |
| 2020 Tax Tables to $500K |
12/2020 | |
| 2020 Tax Tables to $102K | 12/2020 | |
| Calculation Schedule | Use this schedule to calculate the tax if your a.g.i is over $102,000 | 12/2020 |
| Income Tax Calculator | Use this calculator to determine your tax liability, regardless of your a.g.i. | |
| Property Tax Calculator |
Use this calculator to determine the amount of your property tax credit | |
| Social Security Benefits | Use this calculator to determine your Social Security Benefit Adjustment | |