Tax Filing Deadline California 2025. Senate bill 253 required companies that do business in california and have an excess of $1 billion in revenue, defined as “reporting entities”, to submit an annual report for. Key dates include the april 15 filing deadline for your.

But you can also check out our specific guides for llc tax deadlines and s corporation tax deadlines. California requires that a 2024 return must be filed and paid by april 15, 2025.