The fund statement displays various entries related to F&O obligations, margin debits, margin reversals, etc., for F&O trading. The F&O Billamount includes the payable or receivable marked-to-market (M2M) amount. For options trades, settlement is based on the net premium receivable or payable. However, the Bill  amount is calculated using the M2M price when trading futures contracts. At the end of each day, exchanges mark all open futures positions to the closing settlement price for that day and either credit or debit the corresponding amount in the client's fund statement.