What will happen if I dontsquare off my position before Future expiry

What will happen if I don’t square off my position in future before the expiry of the contract.I mean say I have taken a buy postion of 1 lot so if I don’t square of do I need to actually buy the entire 1 lot of share?

Yes, starting from October 2019 expiry, all stock F&O contracts are compulsorily physically settled, check this. If you’re new to Derivatives, learn from Varsity.

@TheGouda what will happen if I hold index future for example say nifty future then I can’t take the physical delivery of nifty in spot market.Then will there will be cash settlement.

Yes, Index derivatives are cash settled.