Before May 1, there used to be multiple margin changes, with the last one being at 2 pm. Now, margins are based on BOD, and only update from day to day.
More chances of market making a large move on a day to day basis, than a 90 minute period (2 pm to 3:30 pm), hence more difficult to predict the EOD margin for a overnight/positional trader.
So like you said in this comment, which am again quoting, if there’s a provision for live margin change/update as per the latest SPAN (either on Kite itself or some place else like your margin calculator), we’ll be better equipped to take overnight positions & utilise funds in an optimum manner. Right now, we’re having to leave more funds than earlier. It doesn’t have to be live all the time, even if we get to know the margin for one particular time before market close, say 3 or 3:15 pm, would also be very helpful.
Mechanics of SPAN is way too complex for an ordinary retailer, and can’t be done without the proper software…