In my understanding, if we sell through ATST, we can save the DP charges of Rs. 12, which is charged on each sell transaction from demat. Am I correct?
Good question!
There are 2 possibilities I see.
You buy a share you don't already have in your demat account or which is likely to be transferred to your demat acount.
The next day, you sell the share. If your broker is offering BTST / ATST for this share, then he will supply the share from his pool account to meet the settlement requirement. You feel there shouldn't be a selling charge since there is no transaction from your demat a/c.
The second possibility is that you already have some shares of a given stock with you in your demat a/c. You buy some more but next day the price shoots up and you sell what you think you bought yesterday. In this case, I feel the broker will make delivery not from his pool but from your demat a/c and you will be charged the depository charge!
Interesting topic! I wish others share their experience.