Nonprofit Tax Deadlines in Connecticut
Federal and state filing dates, extensions, and estimate schedules for 2026.
Connecticut filing deadline
Nonprofit annual return generally due the 15th day of the 5th month.
Due: May 15, 2026
Extension: Nov 15, 2026
Form: State nonprofit return
Estimated payments
No state estimated payment schedule listed.
Due: N/A
FAQ
Does Connecticut require Nonprofit 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 Nonprofit taxes?
Use Connecticut Department of Revenue Services resources at https://portal.ct.gov/DRS for forms and filing instructions.