2025 Form CT-1040
Connecticut Resident Income Tax Return
Download or Print 2025 Connecticut Form CT-1040
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About Connecticut Form CT-1040
Connecticut Form CT-1040 is the resident income tax return for full-year Connecticut residents. Use this form to report Connecticut income, calculate state income tax, claim applicable credits, and determine whether you owe tax or are due a refund. The 2025 Form CT-1040 PDF includes the main resident return, Schedules 1 through 5, tax calculation fields, payment and refund lines, signature fields, and mailing or payment instructions.
Part-year residents and nonresidents generally use Form CT-1040NR/PY instead. Connecticut does not offer a separate Easy Form (EZ) or Short Form for resident individual income tax returns.
Connecticut Form CT-1040 PDF Files by Year
Click any of the Connecticut Form CT-1040 PDF links above to download, save, view, and print the file for the corresponding year. These free PDF files are unaltered and are sourced directly from the publisher.
Related Connecticut Resident Income Tax Forms
Need to download more state income tax forms? View the 2025 Connecticut full-year resident tax forms list.
| Form Code | Form Name |
|---|---|
| Form CT-1040 Instructions | Form CT-1040 Instruction Booklet |
| Schedule CT-EITC | Connecticut Earned Income Tax Credit |
| Schedule CT-IT Credit | Income Tax Credit Summary |
| Form CT-1040 TCS | Connecticut Tax Calculation Schedule |
Frequently Asked Questions (FAQ)
Here are answers to common questions about downloading, printing, completing, and filing 2025 Connecticut Form CT-1040.
When is 2025 Connecticut Form CT-1040 due?
For tax year 2025, Connecticut Form CT-1040 is generally due April 15, 2026. If you need more time to file, review the extension rules in the Form CT-1040 instructions, but pay any tax due by the original deadline to avoid penalties and interest.
Who should use Connecticut Form CT-1040?
Form CT-1040 is used by full-year Connecticut residents to file their individual income tax return. Part-year residents and nonresidents generally use Form CT-1040NR/PY instead.
Does Form CT-1040 include schedules?
Yes. The 2025 Form CT-1040 PDF includes Schedules 1 through 5. Read the form and line item instructions to determine which schedules apply to your Connecticut resident return.
Where can I find the Form CT-1040 instructions?
You can view, download, and print the Form CT-1040 instructions from our Connecticut resident instructions page. Use the instructions to confirm filing requirements, complete each line, choose the correct mailing address, and determine which schedules or supporting forms apply to your return.
Where do I mail Connecticut Form CT-1040?
Read the Form CT-1040 instructions before mailing your return. Connecticut mailing addresses may depend on whether you are making a payment, requesting a refund, or filing a return without payment.
Last updated: August 1, 2026
References:
- Form CT-1040 Connecticut Resident Income Tax Return. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.
- Form CT-1040 Connecticut Resident Income Tax Return Instructions. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.
- Individual Income Tax Forms. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.
- Connecticut Resident, Part-Year Resident, and Nonresident Tax Information. State of Connecticut, Connecticut Department of Revenue. Retrieved August 1, 2026.