Partnership Tax Deadlines in Connecticut
Federal and state filing dates, extensions, and estimate schedules for 2026.
Connecticut filing deadline
CT pass-through returns due March 15 (next business day if weekend).
Due: Mar 16, 2026
Extension: Sep 15, 2026
Form: Form CT-PET / CT-1065
Estimated payments
No state estimated payment schedule listed.
Due: N/A
FAQ
Does Connecticut require Partnership estimated payments?
Estimated payments are not typically required at the entity level, but confirm with Connecticut Department of Revenue Services.
Where can I file Connecticut Partnership taxes?
Use Connecticut Department of Revenue Services resources at https://portal.ct.gov/DRS for forms and filing instructions.