Hi
@curiousv, It depends on the broker and we advise for 50% cash. In case of option selling, you need to clear your debit balance within 5 days else your shares may be sold on 5th day as per SEBI guidelines.
You can use for MIS and NRML.
When you say money against client shares, we understand you are referring to intraday margin against shares. We do not charge any interest if you need margin to trade intraday. Thanks