BTST (Buy Today Sell Tomorrow) - Trades in which you purchase shares and sell them on T+1 or T+2 days before the stock is settled and sent to your DEMAT account.

The risk with BTST trades is that, because you're selling shares that aren't yet in your DEMAT account, you're relying on the seller to deliver the stock to you. If the seller fails to deliver the shares, resulting in a short delivery, your commitment as a seller to provide shares will be breached, and you will be subject to an auction penalty of up to 20% of the value of the stock short delivered.