Hey, this is indeed done as part of the Quarterly Settlement.
Let me explain:
Basis what you’ve explained, I’m guessing you’ve also pledged stocks with us for margins. SEBI recently amended the rules around Quarterly Settlement which affects the way we settle clients who have also pledged securities.
If you’re aware, all brokers insist that 50% of the margins for your positions come in the form of cash and 50% in the form of collateral. So, in the usual case, if you’re holding one lot of Nifty Futures position for which margin of 1.1 lac is required - 55,000 has to be in the form of cash and the other 55% in the form of securities. Earlier, while doing the Quarterly settlement, we would release cash only to the extent what’s excess after applying the 50:50 logic.
So in the above example, if you had a cash balance of Rs.80,000 and collateral worth Rs.1,25,000, the excess cash in your account would be calculated as under:
(80,000 - 50% of Rs.1,10,000) = Rs.25,000. As such, we’ve would have released only 25,000 to your account.
However, SEBI in the new circular said that all the margins have to first be charged from collateral and only if the collaterals are short, charge margins from cash. I’ve highlighted the relevant bit from the SEBI circular.
Considering the same example above, we’d have to now adjust the entire margins from collateral, since there’s enough collateral (margin needed for position = Rs.1,10,000; collateral available = Rs.1,25,000). Applying the new rules, the entire 80,000 cash in your account would have to be transferred back.
It’s for this reason your account has gone into a negative balance. However, please note that there would be sufficient margins available in your account (in the form of collateral) to cover for your position, hence no margin penalty would apply. However, since the 50-50 cash-collateral ratio is imbalanced, you’ll have to ensure you transfer funds back the subsequent day in order to not get any interest charged for the cash shortfall.