As per SEBI regulations, only 80% of the delivery sell amount is made available to invest immediately after a transaction, while the remaining 20% is released on the next trading day. Accordingly, this 20% amount will be added to your Groww balance one day after selling, i.e., on (T+1) day. 


For e.g., If you sell a stock from your holdings on Friday, the remaining 20% amount will be available on Monday (since Monday is the next trading day)