Single member LLCs cannot file Form1065.  File Sched C if business,  Sched E if rental.     

Are you putting the stock trades on the Sched C ?    If yes, why?

I can't answer the California Form 568 - sorry.

SINGLE MEMBER LLC'S ARE REPORTED ON SCHEDULE C IF A BUSINESS.  ANY STOCK TRANSACTIUONS REPORTED ON SCHEDULE D.  SM LLDS' ARE DISREGARDED ENTITIES AND REPORTED ON YOUR PERSONAL TAX RETURN.

IEG

If you check the box at the top of Sch C that its a CA LLC, then when you switch over to the state return (assuming youve installed the 568 module) you should have the SMLLC as an option....it will pull the Sch C info over to it and compute the $800 annual fee.

You want to be sure he qualifies as a day trader, not many people do.

https://www.irs.gov/taxtopics/tc429