Margin Benefit on Hedged Positions: How to Unlock It
Margin benefit on hedged positions is the reduction in blocked margin the clearing corporation grants when two legs of your position offset each other’s risk. You get it automatically when both legs sit in the same account and segment, and lose it the moment the hedge is removed, mismatched, or squared off in the wrong order.
The saving comes from SPAN, a portfolio based margin system that calculates the worst case loss of your whole position rather than adding up each leg separately. A naked short option has an unlimited worst case. Add a long option above it and that worst case becomes a fixed number, so margin drops.
Below: the mechanism, an illustration, the conditions, and where traders lose the benefit at the worst moment.
Why does hedging cut margin so sharply?
Margin has two parts. SPAN margin is computed by the clearing corporation, NSE Clearing or ICCL, by revaluing your whole portfolio across a grid of price and volatility scenarios and taking the largest loss. Exposure margin is a flat layer on top.
Because SPAN looks at the portfolio, not the leg, offsetting positions cancel. If your short call loses Rs 15,000 in a scenario while your long call gains Rs 11,000 in the same one, SPAN sees a net loss of Rs 4,000 and sizes margin against that.
Exposure margin also falls, less dramatically, which is why a hedged position never reaches zero margin.
How much margin do hedged structures actually save?
These figures illustrate the pattern, not a rate card. Actual numbers change daily with volatility, spot and exchange circulars.
| Position | Legs | Illustrative margin | Maximum loss defined? | Typical margin saving |
|---|---|---|---|---|
| Naked short call | 1 short | Rs 1,25,000 | No, open ended | Baseline |
| Bull call spread | 1 long, 1 short | Rs 22,000 | Yes | Around 80% |
| Short strangle | 2 short | Rs 2,10,000 | No, both sides open | Token |
| Iron condor | 2 long, 2 short | Rs 48,000 | Yes | Around 75% vs the strangle |
| Calendar spread | 1 long, 1 short, different expiries | Rs 35,000 | Partly | Moderate, removed on expiry day |
| Covered call on stock | Shares plus 1 short call | Nil beyond the shares | Yes, if shares are pledged | Full, once shares are marked |
Benefit scales with how completely the long leg caps the short leg’s loss. Two shorts offsetting each other, as in a strangle, earn only a token reduction: one large move hurts one side badly while the other side’s gain is capped at its premium.
Worked example: naked short call versus a spread
Suppose Nifty is at 25,000 and the lot size is 75. Confirm the current lot size on the NSE contract specifications page, since exchanges revise it.
Trade A, naked short. Sell one 25,200 CE at Rs 120.
Premium received = Rs 120 multiplied by 75 = Rs 9,000. Illustrative margin blocked = Rs 1,25,000.
Trade B, the same short plus a hedge. Sell the 25,200 CE at Rs 120 and buy the 25,400 CE at Rs 70.
Net premium received = (Rs 120 minus Rs 70) multiplied by 75 = Rs 50 multiplied by 75 = Rs 3,750.
Strike distance = 25,400 minus 25,200 = 200 points.
Maximum loss = (200 minus 50) multiplied by 75 = 150 multiplied by 75 = Rs 11,250.
Illustrative margin blocked = Rs 22,000.
Now the money tied up. Trade A earns Rs 9,000 against Rs 1,25,000, or 7.2% of margin. Trade B earns Rs 3,750 against Rs 22,000, or 17%. Trade B collects less than half the premium, uses capital better, and caps the loss at Rs 11,250.
That is the whole argument for hedged selling: less premium, a known worst case, five times the capital efficiency. Construction details sit in the walkthrough on building a bull call spread.
Five conditions for getting the benefit
- Both legs in one trading account and client code. Two accounts, even if both yours, get no offset.
- Both legs in the same segment and underlying. An index option cannot hedge a stock option.
- The long leg entered first, or simultaneously, else margin is blocked at the naked rate until the hedge lands.
- Quantities matched in lots. Selling three and buying two gives benefit on two and naked margin on the third.
- The hedge held throughout. Margin is recalculated intraday, so losing it briefly restores the full requirement.
Where the benefit disappears
- On expiry day for calendar spreads. SEBI removed the benefit on expiry day, so a near leg expiring that day is margined as though the legs were unrelated. Check the current circular.
- When you square off the long leg first. The short is naked and margin jumps at once, and a shortfall penalty can land on a position you were closing.
- During the physical settlement window on stock options, where exchanges levy delivery margins in a staggered way over the final trading days, rising each day.
- When the long leg is too far away. A hedge 2,000 points out of the money barely reduces the worst case, so it barely reduces margin.
- When the long leg expires and the short remains. Overnight, that is an uncovered position.
Order sequencing: the mistake that costs the most
On entry, place the buy leg first. Most brokers offer a basket or multi leg order for exactly this reason, submitting legs in a sequence that never leaves you naked. Placing the short first, then hunting for a fill on the long, can block full naked margin and reject the second order.
On exit, close the short leg first. Selling your protection while keeping the short is what triggers surprise margin calls late in an expiry session.
One more expiry detail. Indian options are European style, so no early exercise, but a long leg left to expire in the money attracts STT at 0.15% on the exercise settlement value, charged to the buyer. On a barely in the money option that can exceed the intrinsic value you were owed, so square off both legs. The wider framework sits in how options margin is set.
Does lower margin mean lower risk?
Partly, and the distinction matters.
A hedge caps your maximum loss. What it does not do is make the position safe. Because margin is small, traders take far more lots than they otherwise would, and the total capped loss across all of them can exceed the loss they were avoiding.
A plain risk note: size off maximum loss, not margin blocked. If the worst case is Rs 11,250 per lot and you would not want to lose more than Rs 45,000, that is four lots, whatever the calculator allows. The uncapped alternative is described in what naked option selling involves.
Frequently Asked Questions
Do I get margin benefit if my legs are in different expiries?
Yes, but less of it. Calendar spreads earn a partial offset because the two expiries do not move identically. The benefit is withdrawn on the nearer leg’s expiry day, so a position needing Rs 35,000 all month can need far more on the final day. Plan the exit earlier.
Can I hedge a short call with shares I already own?
Yes, that is a covered call, and it removes the option margin requirement provided the shares are pledged as collateral through the margin pledge process. Holding them in your demat account is not enough. The broker needs them marked, or the short call is margined as uncovered.
Does buying a cheap far out of the money option reduce margin much?
Barely. SPAN sizes the benefit by how much the long leg reduces the worst case loss, and a hedge far from the money reduces it very little. Traders buy a Rs 2 option hoping for a large cut and find the requirement unchanged. Move the hedge closer and the benefit appears.
Why did my margin increase overnight on an unchanged position?
Several reasons are possible. Volatility rose, so SPAN’s scenario losses grew. The exchange revised margin parameters. The position entered the physical settlement window for a stock underlying. Or an expiry day rule applied to a calendar structure. Check the margin statement, which itemises SPAN and exposure separately.
Is margin benefit available in intraday trades too?
Yes, as soon as both legs are live. What trips people up is peak margin reporting. Because margin is snapshotted at intervals, a brief window where you held the short without the hedge can be captured and penalised even if the finished position was hedged. Use basket orders.
Key Takeaways
- SPAN margins the portfolio, not the leg, so a long option capping a short option’s worst case cuts margin by roughly 70% to 80%.
- Both legs must sit in one account, segment and underlying, in matched lots, for the whole trade.
- Enter the long leg first, exit the short leg first. Reversing either can spike margin and trigger a penalty.
- Calendar benefit is removed on the near leg’s expiry day, and stock spreads face rising delivery margins in expiry week.
- A hedge far out of the money costs premium and saves very little margin.
- Size off maximum loss per lot, not margin blocked, or the capped loss just arrives in larger quantity.
