Option Strategies

Straddle

Q: How do you calculate the break-even of a straddle?

Add the call and put premiums, then add that total to the strike for the upper break-even and subtract it for the lower. A 24,000 Nifty straddle costing 720 points breaks even at 24,720 and 23,280 at expiry. Before expiry the position can be profitable inside those levels if implied volatility rises or the move comes early.

Q: What does the straddle price tell you about the expected move?

Roughly the size of move the market has priced in by expiry. A 720-point straddle on Nifty at 24,000 implies an expected move of about 3% over 30 days; a 346-point weekly straddle implies about 1.4% in a week. A directional view has to beat that move to be worth more than the straddle itself.

Q: Is a short straddle risky?

Yes. It has unlimited loss on the upside and a loss up to the strike on the downside, requires full SPAN plus exposure margin on both legs, and loses on a volatility spike even without a price move. Its appeal is that it earns the fastest theta on the chain; its danger is a single large move. Buying wings (an iron butterfly) caps the loss.

Q: Should a straddle be bought before results or the Budget?

The straddle price already reflects the event: implied volatility rises into it and typically collapses afterward. A long straddle profits only if the actual move exceeds what was priced, which happens less often than traders expect. Compare the straddle price with the stock’s or index’s historical moves on similar events before buying.

The straddle is a bet on the size of the move, not its direction. Its price is the market’s own forecast of how far the index will travel.

In short: a straddle is a call and a put with the same strike (usually at the money) and the same expiry. A long straddle profits if the underlying moves beyond either break-even, strike plus or minus the total premium, and loses the premium if it stays near the strike. A short straddle collects the premium and profits if the market stays inside the break-evens, with unlimited loss beyond them. The straddle’s price is a direct reading of the move the market expects.

The intuition

Buy a call and you need the market to rise; buy a put and you need it to fall. Buy both at the same strike and you no longer care which, only that it goes far enough to pay for both. That is the long straddle: a position with no view on direction and a strong view that the move will be larger than the premium implies. The seller takes the opposite view, collecting both premiums in exchange for the risk of a large move either way.

Because the straddle pays for movement itself, its price is a market forecast. An ATM straddle costing 3% of the index says the market expects, roughly, a move of about 3% by expiry; it is the simplest way to read implied volatility in points rather than percentages.

Formula

Long straddle cost = call premium + put premium (same strike, same expiry)

Break-evens = strike + cost and strike − cost; maximum loss (long) = cost × lot size, at the strike; maximum profit (short) = cost × lot size, at the strike

Expected move ≈ ATM straddle price (a widely used approximation; the model expected absolute move is about 0.8 × Sσ√T)

A long straddle at the money is near delta-neutral, long gamma, long vega and short theta; the short straddle is the reverse.

Worked example (illustrative numbers)

Suppose NIFTY is at 24,000 and implied volatility is 13%. Model prices of the 24,000 straddle at two expiries:

Expiry	Call + put	Straddle cost per lot (65)	Break-evens	Move needed	Theta per lot per day
30 days	424 + 296 = 720	₹46,800	23,280 / 24,720	±3.0%	about ₹790
7 days	188 + 158 = 346	₹22,490	23,654 / 24,346	±1.4%	about ₹1,610

The weekly straddle is less than half the price of the monthly but decays at twice the daily rate; in the final two sessions the ATM straddle loses most of its remaining value if the index does not move. For the buyer, the 30-day straddle needs a 720-point move by expiry just to break even at settlement, though a sharp move early, or a rise in implied volatility, can make it profitable well before then. For the seller, the ₹46,800 collected is the maximum profit, available only if Nifty settles exactly at 24,000; the realistic target is a fraction of it, exited early.

Long straddle in green, short in red. One side pays for movement; the other is paid to absorb it.

Why it matters to an options trader

It is the cleanest volatility trade. Direction cancels at entry; what remains is realised movement against implied, plus theta.
Its price is the expected move. Before a budget, a policy decision or results, the ATM straddle tells you what size of move is already paid for; a view needs to beat that number, not just be right.
Short straddles are the expiry-day trade on NSE. Selling the ATM straddle in the final session to collect the last of the time value is common; it is also where the largest single-day losses in index options occur when a move arrives.
It is the base of the iron butterfly. Buying wings around a short straddle caps the loss and cuts the margin sharply.

Common mistakes

Buying straddles into known events. Implied volatility is already elevated; after the event IV collapses (IV crush) and the straddle can lose even when the market moves.
Holding a long straddle to expiry. Theta is heaviest at the end; most long straddles are exited on the move or well before expiry.
Selling straddles for the full premium. Maximum profit needs settlement exactly at the strike; targets are typically a third to a half of the credit.
Ignoring margin on the short side. A short straddle is two naked options; SPAN plus exposure for both, rising with any move, and an extra 2% on expiry day.
Forgetting the strike drifts off ATM. After a 200-point move the straddle has delta; it is no longer a pure volatility position unless re-centred or hedged.

Indian-market specifics

Nifty expires weekly and monthly on Tuesday; Sensex weekly on Thursday; Bank Nifty, FinNifty and Midcap Select monthly on the last Tuesday. Weekly ATM straddles on Nifty are among the most traded structures on NSE.
Index options are European and cash-settled at the underlying’s closing value (last-30-minute weighted average); a short straddle’s expiry outcome is decided by that average, not the final tick. NSE index options trade until 15:40 on expiry day.
Short index options carry an additional 2% extreme loss margin on expiry day from November 2024, which raises the capital needed for an expiry-day short straddle.
STT: the buyer pays 0.15% of premium on the sale and 0.15% of intrinsic value if a leg is exercised at expiry; one leg of a straddle is almost always in the money at settlement, so exercise-side STT applies to the long holder unless the leg is sold before close.
Lot sizes: Nifty 65, Bank Nifty 30, FinNifty 60, Sensex 20.

FAQ

How do you calculate the break-even of a straddle?

Strike plus and minus the total premium: 24,720 and 23,280 in the example.

What does the straddle price tell you about the expected move?

Approximately the move priced in: about 3% monthly, 1.4% weekly in the example.

Is a short straddle risky?

Yes: unlimited upside loss, large downside loss, and vega exposure.

Should a straddle be bought before results or the Budget?

Only if the expected move beats what the elevated IV already prices.

Read the expected move from the chain

The long straddle and short straddle strategy pages show payoff tables for both sides. In the app, the Option Chain page shows ATM call and put premiums with implied volatility, and the IV page tracks the volatility level the straddle is priced from.

Long straddle strategy page Implied volatility today

Related terms

Strangle, the cheaper, wider version
Implied Volatility, what the straddle price measures
Theta Decay, the straddle’s daily cost
IV Crush, why event straddles disappoint