Regarding call or put writing

If I want to short a put or call for benefit from time value is it mandatory to have that underlying share in my demat account at the time of expiry? Or what if I square off before expiry say 1 hour before…

What is the amount required for short selling put or call 1 lot of nifty/ banknifty for 2-3 weeks till expiry…Suppose for eg 10000 Pe/CE of nifty…

you short and exit anytime, no need to wait till expiry.

for Nifty CE PE margin calculation see this Margin Calculator

Panic Spread faster than Greed. Shorting Puts is Danger. It can wipe out your Account. Understand HUGE Risks involved with Shorting Options.

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OK thanks @haribabu