Lets say I have a whole lot of TCS which is 300 shares...now I pledge it to get collateral margin. 

I Understand I need 50% cash ..when I write a call against this holding...

but in the last week of expiry if it becomes in the money - what will be margin requirement ?

Also, if I decide to give delivery of my holding what do I need to do ? and I believe for such physical delivery there will be additional 0.5% brokerage because its outcome of option? @Tejas Khoday @Vanshika Singh @pradeep kalra