Extreme Loss Margin

The VaR margin is a statistical estimate: it covers the loss a stock is likely to suffer on a bad day, based on its history and volatility. Statistics, by construction, do not cover the days that have never happened before.

The Extreme Loss Margin is the buffer for those days. The workbook puts it plainly — it "aims at covering the losses that could occur outside the coverage of VaR margins".

It is deliberately simple. Where the VaR margin is recomputed through the day and differs from stock to stock, the Extreme Loss Margin shall be 3.5 per cent for any stock. One rate, every scrip, no modelling.

Margin exists because settlement is not instantaneous. Between the trade and the pay-in, prices move, and a buyer sitting on a loss becomes less willing to pay while a seller watching the price run up becomes less willing to deliver. Margin is the deposit that makes reneging expensive.

In the cash segment, the margin on equity shares is imposed daily and is the sum of three components:

Brokers collect margin from clients when the order is placed; stock exchanges collect from brokers when the order is executed. A trading member's liquid assets must at all times be enough to cover MTM losses, VaR margins, Extreme Loss Margins and Base Minimum Capital — and those liquid assets may be cash, fixed deposits, bank guarantees, government securities or exchange-traded securities.

If margin falls short, the consequence is immediate: the trading member's terminals are de-activated. Whatever residual risk survives all of this is backstopped by the Core Settlement Guarantee Fund.

Extreme Loss Margin = 3.5% × Value of the position

Total cash-segment margin = VaR margin + Extreme Loss Margin + MTM margin

An investor buys 1,000 shares at Rs 450 on the exchange.

Position value = 1,000 × Rs 450 = Rs 4,50,000

Suppose the exchange's VaR margin rate for this stock, on this day, is 12.5 per cent (it is stock-specific and refreshed through the day; the ELM is not).

The investor must have Rs 72,000 available with the broker when the order is placed — not the full Rs 4,50,000, which is due at pay-in.

The next day the stock closes at Rs 438. An MTM margin of 1,000 × Rs 12 = Rs 12,000 falls due at the start of the following trading day, on top of the Rs 72,000 already blocked.

Notice how the ELM behaves against the VaR margin. Take a quieter stock whose VaR rate is 8.5 per cent: total margin 12 per cent. Take a volatile one at 22 per cent: total 25.5 per cent. The Rs 15,750 of ELM does not move in either case — 3.5 per cent of position value, always. That fixed floor is precisely its purpose.

Chapter 4 (Secondary Markets), section 4.6.4 (Margins and cross-margining), where the three cash-segment margins are listed in order, and again in section 4.9.1 where liquid assets must cover MTM losses, VaR margins, Extreme Loss Margins and Base Minimum Capital. The ELM rate comes from SEBI's margin framework circular of 24 February 2020. Because 3.5 per cent is the only hard number in the section, it is the one most likely to be asked outright — typically "the Extreme Loss Margin shall be ___ per cent for any stock", or a question asking which of the three margins is the same for every scrip.

• 3.5 per cent, flat, for any stock. It does not vary with volatility, with the client, or with the size of the position. If an answer option makes it stock-specific, that option is describing the VaR margin.
• ELM is additional to VaR margin, not an alternative to it. The cash-segment margin is the sum of VaR + ELM + MTM.
• This is the cash segment. The derivatives segment has its own margin structure — initial margin, exposure margin and assignment margin — and the 3.5 per cent figure belongs to the equity cash market.
• MTM margin is computed at the end of the day and payable at the start of the next trading day, not collected intraday like the upfront margins.
• Margins are returned once pay-in is completed. They are collateral against default, not a fee or a cost of trading.
• A margin shortfall de-activates terminals immediately and attracts a daily penalty on a pay-in shortfall. The consequence is operational, not merely financial.