What is SPAN Margin?
SPAN (Standard Portfolio Analysis of Risk) margin is the minimum margin NSE clearing requires to hold a derivatives portfolio, computed from scenario-based risk across price and volatility moves. It replaces fixed-percentage margin with a portfolio-aware number that can shrink when you hedge and expand when exposure concentrates.
What SPAN margin is and why it matters
SPAN margin is the core F&O margin framework on NSE. Clearing simulates gains and losses under multiple price and volatility scenarios and charges the worst-case loss (with offsets for hedged books). For intraday and positional F&O traders, SPAN is the baseline capital lock — not the full story, but the number that determines whether you can carry positions overnight.
Indian market context (NSE F&O)
NSE applies SPAN plus additional exposure margin on index and stock derivatives. Peak margin rules require brokers to collect minimum margin intraday as well. On weekly Nifty/Bank Nifty expiry, SPAN can jump with volatility — especially after gap opens or RBI events. Stock F&O in ASM/GSM or ban periods can see elevated margins or trading restrictions.
Worked example
Illustrative Nifty futures position — always confirm live SPAN with your broker.
| Field | Illustrative value |
|---|---|
| Instrument | Nifty monthly futures — 1 lot |
| SPAN margin | ₹1,20,000 (example) |
| Exposure margin | +₹40,000 approx. |
| MTM buffer recommended | +₹30,000 |
| Total prudent allocation | ₹1,90,000 |
Common mistakes
- Sizing positions using notional value instead of SPAN plus buffer.
- Ignoring SPAN changes after adding a second correlated leg.
- Carrying full size into expiry week without checking revised SPAN.
- Not logging margin utilization — so MTM pain shows up only at auto square-off.
How to validate
- Validate SPAN Margin separately for index weeklies vs stock options.
- Stress-test with expiry-week and event-week subsets (RBI, budget, results).
- Confirm margin and tail-loss scenarios are logged for short premium books.
- Discard readings polluted by untagged discretionary adjustments.
How to track in TradeLyser
- Tag every leg: structure, DTE, moneyness, and whether SPAN Margin was a primary driver.
- Log planned max loss ₹ on entry for short premium strategies.
- Weekly: list open short ITM/ATM legs before expiry with a written roll/close rule.
- Separate F&O account tags from cash equity for SPAN Margin statistics.
Best practices
- Size SPAN Margin trades with margin headroom for gaps and assignment.
- Prefer defined-risk structures when learning a new options concept.
- Roll or close based on written DTE rules, not convenience.
- Keep weekly index and monthly stock books in separate tags.
Common pitfalls
- Short premium without defined max loss while SPAN Margin risk builds.
- Holding illiquid stock options into expiry without a plan.
- Blending index and stock gamma exposure in one tag.
- Ignoring margin spikes on gap opens.
How to use this in TradeLyser
Add a daily margin note field in TradeLyser: SPAN required, cash available, and % utilization. Filter losing weeks by high margin-utilization days to see if sizing was structurally too large.
Reference guide
| Context | Value | Reading |
|---|---|---|
| Capital planning | Keep 25–40% buffer above SPAN for MTM swings | Running at exact SPAN with no buffer on expiry week |
| Portfolio hedging | Offsetting long/short legs reduce net SPAN | Treating each leg margin independently when they are correlated |
Related terms
Auto square off is an automated broker action that closes open positions without trader initiation — typically when MIS intraday cut-off passes, margin falls below requirements, or risk limits are breached. Fills may be at market price during thin liquidity.
A futures contract obligates parties to transact the underlying at settlement per NSE rules, with daily mark-to-market and margin.
Index futures are standardized NSE F&O contracts on benchmark indices (notably Nifty 50 and Nifty Bank) that cash-settle against official closing prices. They offer leveraged exposure to broad market direction with transparent lot sizes and deep liquidity relative to most stock futures.
Lot size is exchange-defined quantity per derivative contract — changes periodically.
Margin is the deposit brokers require to hold leveraged positions. It can rise sharply into expiry or on gap moves against you.
Mark to market (MTM) is the daily revaluation of open derivatives positions against the exchange settlement or closing price, with profits credited and losses debited to your ledger. On NSE F&O, MTM runs on open futures and options positions so capital reflects current risk, not just entry price.
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Sources & References
- ↗NSE equity derivatives — SPAN margin — NSE (accessed 2025-06-01)
- ↗NSE equity derivatives overview — NSE (accessed 2025-06-01)
FAQ
Is SPAN margin the same as total margin blocked?
No. Brokers typically block SPAN plus exposure margin and may hold additional funds for MTM losses or peak margin compliance. Always check total available margin, not SPAN alone.
Does hedging reduce SPAN on NSE?
Often yes — offsetting positions in the same underlying or correlated index legs can lower portfolio SPAN versus naked directional exposure. Verify in your broker SPAN calculator after placing both legs.
Why did my SPAN jump overnight?
Volatility regime changes, open MTM loss, new positions, or contract roll into a nearer expiry can all increase SPAN. Review the margin break-up on the morning of expiry or after large gap moves.
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