California Partnership Tax Deadlines 2026
Complete guide to Partnership filing dates, extensions, estimated payment schedules, and required forms in California for the 2026 tax year. California imposes a state income tax, so Partnership entities must file both federal and state returns.
California Partnership filing deadline
Automatic extension for CA partnerships; payment still due by original date.
Due: Mar 16, 2026
Extension: Oct 15, 2026
Form: Form 565
Estimated payments
No state estimated payment schedule listed.
Due: N/A
California Partnership Tax Calendar at a Glance
| Event | Date |
|---|---|
| Filing deadline | Mar 16, 2026 |
| Extension deadline | Oct 15, 2026 |
FAQ
When is the Partnership tax filing deadline in California for 2026?
The California Partnership tax return is due Mar 16, 2026 for the 2026 tax year. An extension is available until Oct 15, 2026.
Does California require Partnership estimated tax payments?
Estimated payments are not typically required at the entity level for Partnership in California, but confirm with California Franchise Tax Board.
What form do I file for a Partnership in California?
Partnership entities in California file using Form Form 565. You can download the form from California Franchise Tax Board at https://www.ftb.ca.gov.
Can I get an extension for my California Partnership tax return?
Yes. California allows an extension for Partnership returns until Oct 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 California?
California 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 California Partnership taxes?
File through California Franchise Tax Board. Visit https://www.ftb.ca.gov for e-filing options, downloadable forms, and payment portals.
California Estimated Tax Payments
View the full quarterly estimated payment schedule for California, including all entity types and payment methods.
View California estimated payments →