If you are filing a Form 540, then you'd only send a copy of your federal return IF it included schedules other than these: schedule A, schedule B, schedule L or schedule M.
If it does have additional schedules aside from the ones listed above, attach a copy of your federal Form 1040 return and all supporting federal forms and schedules to Form 540. If there are no other schedules included aside from A, B, L, or M; do not send the federal return.
EXCEPTION: If you did not itemize deductions on your federal tax return but will itemize deductions on your California tax return, complete and attach a copy of the federal Schedule A (Form 1040) to Form 540.
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