As per SEBI Regulations, settlement cycle for derivative segment (F&O) is T+1 day. This implies that if you make profits trading in derivative segment (F&O), it will be eligible on the T+1 day only.

Hence, if you take an F&O position & make profits, we will not consider the profits made on T Day while reporting margins to the exchanges, since the profits are realized on T+1. These profits will not be clear balance on that day, and thus won't be considered as available margin for trading in F&O.