General ledger or balancesheet!!

Hi, I am an arbitrager by profession on a commsission basis. I want to file my returns by myself,I know the procedure and everything. Just have one doubt, is it okay if I just maintain a "GENERAL LEDGER" or do I also need to maintain "Balance sheet" & "PnL sheet", just incase if there is any query from the IT DEPARTMENT, will a General ledger be sufficient? Thanks, Harshit Patel..