What is Exposure Margin in F&O? How It Adds to SPAN Margin
Exposure margin is an additional margin collected over and above the SPAN margin for F&O positions. While SPAN covers the estimated worst-case single-day loss, exposure margin acts as a buffer for risks that the SPAN model may not fully capture, such as gap openings, sudden news events, or extreme market conditions.
If SPAN margin is your primary insurance cover, exposure margin is the additional cover for catastrophic events. SPAN handles everyday risk. Exposure margin handles the risk that SPAN's scenarios might underestimate.
How is exposure margin calculated?
For index futures and options, exposure margin is typically 3% of the contract value. For stock futures and options, it is higher, usually 5% to 10% of the contract value or 1.5 standard deviations of the daily logarithmic returns, whichever is higher. The exchange publishes the exact rates.
Total Initial Margin = SPAN Margin + Exposure Margin
For example, if SPAN margin for a stock futures position is Rs.40,000 and exposure margin is Rs.20,000, you need Rs.60,000 in your account to hold that position.
Can exposure margin be met with pledged shares?
SEBI allows SPAN margin to be met with a combination of cash and pledged shares, but at least 50% of the total margin must be in cash or cash equivalents. Exposure margin can be entirely met through pledged shares after the appropriate haircut. This flexibility helps traders deploy their capital more efficiently.
F&O trading involves substantial risk. This article is for educational purposes only.
Frequently Asked Questions
Why is exposure margin needed if SPAN already covers risk?
SPAN uses historical scenarios and statistical models that work well under normal conditions. But markets occasionally experience moves far beyond what the model predicts, such as flash crashes or overnight geopolitical events. Exposure margin provides a safety cushion for these tail-risk scenarios that SPAN alone may not cover.
Is exposure margin the same for all stocks?
No. Stocks with higher volatility or lower liquidity have higher exposure margin percentages. The exchange sets exposure margins based on each stock's risk characteristics. More volatile or less liquid stocks require a larger buffer.
Does exposure margin change frequently?
Exposure margin percentages are relatively stable compared to SPAN, which changes with daily volatility. However, the absolute amount changes because it is calculated on the current contract value. As the stock price changes, the rupee amount of exposure margin changes proportionally.
What happens if I do not have enough margin for both SPAN and exposure?
Your order will be rejected if you do not meet the full initial margin requirement (SPAN + Exposure). If your margin falls below the required level while holding a position, your broker can issue a margin call and eventually square off your position if you do not add funds.
Can I see the SPAN and exposure margin breakdown separately?
Yes. Most broker platforms and the NSE margin calculator show SPAN and exposure margins separately. This transparency helps you understand how much of your blocked margin covers estimated risk (SPAN) and how much is the buffer (exposure).
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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