In the case of F&O trading, the gains realized fall under PGBP (Non- speculative income). Net profit is considered while filing ITR. For details refer to Varsity Turnover, Balance Sheet, and P&L – Varsity by Zerodha and Quicko Tax on F&O - Futures and Options Trading | Learn by Quicko.
Also, taxation on F&O and Intraday trading is explained in this post :
https://tradingqna.com/t/taxation-on-intraday-futures-trading/98532