Yes, according to the State of California, you should attach your W-2 if you mail in your 540.
Per the 540 Instructions, if you forget to send your Form(s) W-2 or other withholding forms with your income tax return, do not send them separately, or with another copy of your tax return. Wait until the FTB requests them from you.
For more information, please see 2023 540 Instruction Booklet.
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