We will update the SPAN after markets close. If any margins go up, then customers can add more funds in the evening. With the new rule, if we update SPAN even at, say 3 PM, and assuming the SPAN has gone down, there will be a margin penalty that we will have to bear on all customers taking new positions post 3 PM with lower margins.
Btw, let me figure out if we can allow an easy way to export positions to our margin calculator, which can be updated with the latest SPAN. For those customers who want to see the latest margins as per the latest SPAN.