Does the Calif estimated tax penalty apply even if you are due a refund, as does the federal estimated tax penalty? Instructions for line 67 of 2006 Form 540 does not state that explicitly, as do the instructions for line 77 of 2006 Form 1040. On the contrary, the instructions for line 67 state that if line 48 is less than $200 or less than 10% of line 30, "Stop. You are not subject to an estimated payment penalty". Line 48 is non-zero only if you owe taxes.
I also looked at Form 5805 and it instructions, to no avail. But I might have overlooked something. If the Calif estimated tax penalty does apply even if you are due a refund, I would appreciate it if you would point me to the explanation of that fact.