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Stay informed with important tax dates, helpful links, and practical tips for California taxpayers.
Important Dates
2026 Tax Calendar
Jan 15, 2026
Q4 2025 estimated tax payment due
Apr 15, 2026
Individual tax returns due + Q1 estimated tax payment
Jun 15, 2026
Q2 estimated tax payment due
Sep 15, 2026
Q3 estimated tax payment + extended individual returns due
Oct 15, 2026
Extended corporate and partnership returns due
Dec 31, 2026
Last day for tax-loss harvesting and retirement contributions
Helpful Links
Tax Tips for California Taxpayers
Maximize Retirement Contributions
For 2026, you can contribute up to $23,500 to a 401(k) and $7,000 to an IRA. Those 50 and older get additional catch-up contributions.
Track Charitable Donations
Keep detailed records of all charitable contributions. Donations over $250 require written acknowledgment from the organization.
Home Office Deductions
If you use part of your home exclusively for business, you may qualify for the simplified method ($5 per sq ft, up to 300 sq ft) or the regular method.
California-Specific Credits
California offers credits for renters, child adoption, and dependent care. Check eligibility — these can significantly reduce your state tax liability.
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