Filing Jointly Living Separate in California

[HRP20]

I read the IRS doesn't care about being Married, but living separately and still filing Jointly, but States vary. What is the Rule for California? Also, want to confirm whether listing both addresses is required or if the address is just about where to receive mail or does it indicate a primary residence, etc?

[xmasbaby0]

Are both homes in CA?  If both of you live and work in CA, owning a second home does not affect your ability to file a joint return for CA, even you live apart.   If you are filing a joint tax return, you do not have to tell CA you live at separate addresses.   You can file jointly no matter where you live -- apart or together.    Since you are filing ONE joint state tax return, use the address where you want the state to send a letter or a check to the two of you.  When you file jointly, your refund will  be in both names, and any mail sent to you will be for both of you.   The fact that you own a "second home" is irrelevant.