Individual Income Tax Forms
File Your 2020 Connecticut Income Tax Return Online!
There are free, online state income tax filing options available to you, including the DRS Taxpayer Service Center.
Benefits to electronic filing include:
- Simple, secure, and can be completed from the comfort of your home.
- Can reduce return errors.
- Results in an immediate confirmation that your submission has been received by DRS.
- If you are expecting a refund, electronic filing is the quickest way to receive the refund.
Please consider an electronic option to file your state income tax return this year. Thank you!
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-8822 | Change of Address | 2010 |
| 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 | |