Comment on STT Trap - Options Expiry - NSE BSE MCX-SX
Arun, if you sell the options on the exchange STT will be 0.017% of the premium turnover, so 0.017% of 4000 x 0.15 which is around Rs 1.
If you don’t sell the options, and let it expire, STT will be 0.125% of the contract turnover, so 0.125% of 4000 x 160.15 which is Rs 800.
So it is always best to sell it on the exchange rather than letting expire, if you are holding in the money options.