@nithin I tried to find my answer however thread is too long, to avoid confusing myself, I though to write a reply.
As an option writer, I have already paid STT while writing option, I would like to understand consequence (if any) in case my option goes in the money and does not become zero (since there is intrinsic value). My first attempt will be to square off however just in case I don’t find a seller later to help me square off my position.
@nithin Trying to understand this STT trap issue with an example. Let’s say Ashok Leyland share price is 165 as on day of expiry. What happens if I have call option with 155 strike price. Do I need to square off my position or can I let it get exercised? Which would be more profitable? Wht would be STT implications in both cases?
I’m breaking up your question into 2 scenarios; implications of exercising and implications of squaring off:
If you square off
Assume you sell the option at Rs.9, your realised credit is 9(x)7000 = 63,000 (Lot size of Ashok Leyland = 7000)
STT you pay on the square off trade = 9(x)7000(x)0.05% = Rs.32
If you exercise
If you hold a 155 Strike call and the settlement price is 165, then your option expires in the money and on settlement, you’ll receive a credit of Rs.70,000 [(165-155)x7000].
The STT you would pay would be 165(x)7000(x)0.125% = 1444.
Thanks Venu
PLEASE HELP ME.
“So on the expiry day, there will be an option to not exercise certain strikes of options (those which are expiring just ITM and where STT is more than the intrinsic value of the option).”
Where do I specify it. Yesterday I bought BankNifty 31500PE at Rs 26 yesterday and it closed at 31472. I let it expire and am really worried about paying 2300 odd as taxes 
Please help - How do I specifty “NOT TO EXERCISE” and avoid this STT trap
We will take care, client need not worry about this, if STT is higher than premium then we don’t exercise it.
Thank you. Great
Has the proposal to charge STT based on price difference instead of entire contract value has been implemented?
Not yet. Supposed to be implemented from 1st september.
Sorry for confusion. What you won’t exercise? You will squareoff the position before the expiry or let it expire as ATM?
We don’t give it to exercise, let it expire worthless.
But how ITM would be worthless? It will expire with some intrinsic value.
Isn’t it?
Theoretically yes, but exchange started giving broker option to do so only in case if premium won’t cover for STT.
So it’s advisable to exercise deep itm rather than squaring off the position… Since profit would b higher when exercised even by paying higher stt?
Right?
Please can you explain this in simple words
Wait for 2 more weeks and the new STT rules for options will be in place. (from Sep 1 onwards … dont know when sebi and exchanges will sent out notices).
Check this:
is it true?
Update
From Sep 1st STT on exercised options is on the intrinsic value and not contract value
