Connecticut Partnership Tax Deadlines 2026

When is the Partnership tax filing deadline in Connecticut for 2026?

The Connecticut Partnership tax return is due Mar 16, 2026 for the 2026 tax year. An extension is available until Sep 15, 2026.

Does Connecticut require Partnership estimated tax payments?

Estimated payments are not typically required at the entity level for Partnership in Connecticut, but confirm with Connecticut Department of Revenue Services.

What form do I file for a Partnership in Connecticut?

Partnership entities in Connecticut file using Form Form CT-PET / CT-1065. You can download the form from Connecticut Department of Revenue Services at https://portal.ct.gov/DRS.

Can I get an extension for my Connecticut Partnership tax return?

Yes. Connecticut allows an extension for Partnership returns until Sep 15, 2026. Note that an extension gives you more time to file, not more time to pay — any tax owed is still due by the original deadline of Mar 16, 2026.

What are the penalties for filing late in Connecticut?

Connecticut typically charges a failure-to-file penalty (usually 5% of unpaid tax per month, up to 25%) and a failure-to-pay penalty (usually 0.5-1% per month). Interest also accrues on unpaid balances. Filing for an extension by the original deadline avoids the failure-to-file penalty but not the failure-to-pay penalty.

Where can I file Connecticut Partnership taxes?

File through Connecticut Department of Revenue Services. Visit https://portal.ct.gov/DRS for e-filing options, downloadable forms, and payment portals.