If T+2 days only then charge of 25 be applicable .
if t+1 days is charged then change broker to zerodha . your broker is scamming you
Case1. You buy the stock today morning as CNC and sell the stock today itself before 3:20 pm as CNC. You are at T+0 day. Even though you have chosen the product type as CNC, you will be charged with Intraday charges only (i.e. STT of 0.025% see here
http://zerodha.com/charge-list 94). Also there will not be any DP charges (flat Rs.13 per scrip only) in your demat account, since you have sold on same day.
Case2. You buy the stock yesterday morning as CNC and sell the stock as CNC anytime today. This is BTST concept (Buy Today and Sell Tomorrow). You are at T+1 day. In this case you need to pay all the charges as per Delivery trade since you have bought the stock and kept it overnight. So STT will be charged at the rate of 0.1%. But here since the stocks will be delivered to your demat account only by today evening (T+1 day evening or maximum T+2 day tomorrow morning), you are selling the stock before it reaches your demat account. So there will not be any DP charges in your Demat Account.
Case3. You buy the stock day before yesterday morning as CNC and sell the stock today anytime as CNC. You are at T+2 day. You will be charged like a normal Delivery charges. i.e STT of 0.1% will be charged, like usual. Since shares are already delivered to your demat account, yesterday evening or today morning, you have to bear the DP charges of Rs.13 also.
Case4. You buy the stock anytime 2 days before yesterday. That is you are at today T+3 or T+4 day, etc. In this case you need to bear charges similar to case 3. Both STT of 0.1% and DP charges of Rs.13. But here there is no risk of Short Delivery or Auction penalty, since the shares will be confirmed present in your demat account. In first 3 cases, you may face (very rare chance) of Auction Penalty, in case the seller whom from who bought the shares failed to give you the shares and defaulted.
T0 day – STT 0.025% - No DP Charges – No risk of auction penalty
T1 day – STT 0.1% - No DP charges – Risk of auction penalty
T2 day – STT 0.1% - DP charges applicable – Risk of action penalty
T3 day – STT 01.% - DP charges applicable – No risk of action penalty
Hope you understand. Cheers!