Comment on STT Trap - Options Expiry - NSE BSE MCX-SX
When you buy an option the maximum loss you can make is the Option Premium that you’ve paid..On the day of expiry, if the option that you have purchased is Out of the money then they expire worthless.. Higher STT will be applicable only in case you do not square off an “In the money” option..It is explained in detail here: http://zerodha.com/z-connect/queries/stock-and-fo-queries/stt-options-nse-bse-mcx-sx