Connecticut Personal Tax Extension 2026: 2025 Tax-Year Filing Guide
Individual Income Tax · Connecticut CT-1040 · CT-1040NR/PY · CT-1040NR/PY
This guide explains the Connecticut personal tax extension for the 2025 tax year. Most individuals receive an automatic with federal extension to October 15, 2026, but payment is still due by April 15, 2026. For federal filing details, see our federal tax extension resources.
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Connecticut (CT) gives most individuals an automatic filing extension. File by October 15, 2026, and pay any Connecticut tax owed by April 15, 2026.
Connecticut Personal Tax Extension: Filing Details
Connecticut generally grants an automatic six-month extension for individual income tax returns. The extended filing deadline for a 2025 calendar-year return is October 15, 2026.
The extension applies to filing time only. Pay any balance due by April 15 to limit penalties and interest.
Quick Reference: Deadlines and Forms
Use this summary to confirm Connecticut personal filing deadlines, return forms, and payment requirements.
| Item | Connecticut personal return | Deadline or method |
|---|---|---|
| Original deadline | 2025 Connecticut return | April 15, 2026 |
| Extended deadline | Automatic with Federal extension | October 15, 2026 |
| Return forms | CT-1040, CT-1040NR/PY, CT-1040NR/PY | Use the form for your filing status |
| Payment form | CT-1040 EXT | Payment remains due April 15 |
Frequently Asked Questions
Answers about Connecticut personal tax extensions. Confirm current rules with the Connecticut Department of Revenue Services (DRS).
Visit myconneCT →Most individuals receive an automatic Connecticut extension and do not need to submit a separate extension form. The extension moves the filing deadline to October 15, 2026, but payment remains due April 15, 2026. For business filings, see our Connecticut business tax extension page.
Use CT-1040, CT-1040NR/PY, or CT-1040NR/PY based on your filing status and residency. The Connecticut Department of Revenue Services (DRS) instructions for each form explain who should use it.
No. Connecticut tax is due by April 15, 2026. Pay through My Connecticut Taxes or use the applicable payment method to limit penalties and interest.
For most 2025 calendar-year individual returns, the Connecticut extended filing deadline is October 15, 2026. Check the current myconneCT individual filing guidance if your circumstances differ.