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California Individual Income Tax Filing deadlines and extensions for 2025 tax professionals to reference when working with clients.
If your client is a resident or has been involved in significant business operations within California, they might be required to file California State Taxes. This document outlines the most important tax deadlines and tax extensions for California in 2025.
If your clients are residents or have been involved in significant business operations within California, they might be required to file California State Taxes. This document outlines the most important tax deadlines and tax extensions for California in 2025.
California C Corporation Tax Deadlines for 2025
You must file and pay Corporate Income Taxes in California by April 15, 2026.
Extension to File Taxes in California for 2025
The Extension Deadline for California corporate income tax returns is November 15, 2026.
California automatically grants a seven-month extension on filing corporate income tax returns. This means you do not need to file for an extension in California.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
California S Corporation & Partnership Tax Deadlines for 2025
You must file in California by March 15, 2026.
Extension to File S Corporation & Partnership Taxes in California for 2025
The Extension Deadline for California S-Corporation tax returns is September 15, 2026.
The Extension Deadline for California Partnership income tax returns is October 15, 2026.
California automatically grants a six-month extension on filing S-Corporation income tax returns and automatically grants a seven-month extension on filing Partnership income tax returns. This means you do not need to file for an extension in California.
This is an extension to FILE, not an extension to PAY – payment is still due March 15, 2026.
Estimated Tax Deadline for California 2025
Estimated tax payments are due:
Individual Tax Deadline for California 2025
You must file and pay Individual Income Taxes in California by April 15, 2026.
Extension to File Taxes in California for 2025
The Extension Deadline for California individual income tax returns is October 15, 2026.
California automatically grants a six-month extension on filing personal income taxes. This means you do not need to file for an extension in California.
This is an extension to FILE, not an extension to PAY – payment is still due April 15, 2026.
Estate Tax Deadline for California 2025
California Estate Tax filings are due by April 15, 2026.
Farmer and Fisherman Taxes for California 2025
If at least two-thirds of your clients’ 2024 and 2025 gross income is from farming or fishing, they may do either of the following:
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The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
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