To withdraw the deposited margin amount with ICICI Securities, you need to place the release margin request to the extent of free margin available through the link available on the "I-Sec Margin Details" page on the FNO section of I-Direct web site. The same can be done under the following scenarios: a) By blocking additional shares lying in your demat account up to the extent of margin required. b) By squaring off the open positions. The released margin amount will immediately get credited to the FNO allocation of your linked bank account. In case if there is no margin withdrawal request placed in your account, the excess free margin available with ICICI Securities at end of day would be credited to your linked bank account on the same day. To illustrate, On T-1 day, Rs.100000 margin was required on your total open positions (Rs.60000 as shares and Rs.40000 cash debited from your allocation and kept in I-Sec Margin account) and supposing on T day eod, the new margin requirement is Rs.90000. At the same time suppose you have blocked 50000 as shares as margin on T day itself. In such case, system would release (credit) 40000 cash in your bank allocation.