Ms Jyotsna rightly said and the income from the F&O transactions is always business income and it is not subject to capital gains tax. Gross income from the futures & options is taken for the calculation of gross receipts/turnover for the purpose of Section 44AB/44AD not the entrire transactions of F&O. Therefore, when you calculate the gross receipts it should be sum of your income not the sum of your transactions. From your income you can deduct all your expenditure including depreciation if any asset is used for the purpose of this business.
CA. Kacham Shekhar