File Your 2025 Connecticut Income Tax Return Online!
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!
Instructions
| Name | Description | Revised Date |
| CT-1040 |
2025 Connecticut Resident Income Tax Return Line Instructions |
12/2025 |
| CT-1040NR/PY |
2025 Connecticut Nonresident and Part-Year Resident Income Tax Return Line Instructions |
12/2025 |
Resident Form
| Name | Description | Revised Date |
| CT-1040 |
2025 Connecticut Resident Income Tax Return |
12/2025 |
Part-Year/Nonresident Forms
| Name | Description | Revised Date |
| CT-1040NR/PY | 2025 Nonresident/Part-Year Resident Tax Return | 12/2025 |
| Schedule CT-SI | Nonresident or Part-Year Resident Schedule of Income from Connecticut Sources | 12/2025 |
| Schedule CT-1040 AW | Part-Year Resident Income Allocation | 12/2025 |
EITC Forms
| Name | Description | Revised Date |
| Schedule CT-EITC |
2025 Connecticut Earned Income Tax Credit |
12/2025 |
| APL-505 | Taxpayer's Earned Income Tax Credit Protest |
9/2022 |
Other Forms & Schedules
| Schedule CT-1040 REC | Real Estate Conveyance Tax Credit Schedule - Used for Purposes of Completing Form CT-1040 | 12/2025 |
| CT-1040 EXT | Application for Extension of Time to File Connecticut Income Tax Return for Individuals | 12/2025 |
| Schedule CT-Dependent | CT Resident Dependent Information | 12/2025 |
| Schedule CT-BIO | Bioscience Worksheet | 12/2025 |
| Schedule CT-PE | Pass-Through Entity Tax Credit | 12/2025 |
| Schedule CT-IT Credit |
Income Tax Credit Summary | 12/2025 |
| CT-1040BA | Nonresident Business Apportionment Schedule | 12/2025 |
| CT-1040CRC | Claim of Right Credit | 12/2025 |
| Schedule CT-CHET |
2025 Connecticut Higher Education Trust (CHET) 529 College Savings Plan Contribution | 12/2025 |
| CT-1040EFW | Connecticut Electronic Withdrawal Payment Record | 12/2022 |
| CT-1040ES |
2026 Estimated Connecticut Income Tax Payment Coupon for Individuals |
12/2025 |
| CT-1040ES | 2025 Estimated Connecticut Income Tax Payment Coupon for Individuals | 12/2024 |
| CT-1040V | Connecticut Electronic Filing Payment Voucher | 12/2025 |
| Schedule CT-1040WH |
Connecticut Income Tax Withholding Supplemental Schedule | 12/2025 |
| CT-1040X | Amended Income Tax Return for Individuals - NOTE: If you are claiming EITC on Form CT-1040X, you must include Schedule CT-EITC in your submission | 12/2025 |
| CT-1127 | Application for Extension of Time for Payment of Income Tax | 12/2025 |
| CT-19IT | Title 19 Status Release Form | 12/2025 |
| CT-2210 | Underpayment of Estimated Income Tax by Individuals, Trusts, and Estates | 12/2025 |
| CT-3911 | Taxpayer Statement Regarding Refund -Use this form to report a lost, stolen or missing refund check | 12/2023 |
| CT-4852 | Substitute for Forms W-2 and 1099-R | 12/2023 |
| CT-6251 |
Connecticut Alternative Minimum Tax Return | 12/2025 |
| CT-8379 | Nonobligated Spouse Claim | 12/2025 |
| CT-8801 | Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and Estates | 12/2025 |
| CT-8857 | Request for Innocent Spouse Relief | 12/2024 |
| OP-186 | Individual Use Tax Return | 2018 |
| 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 |