Long Straddle Strategy on Nifty: Event Trades, Breakevens and Volatility Crush Risk

A long straddle strategy on Nifty is what you reach for when you’re fairly sure the index is about to move a lot but have no idea which way. You buy a call and a put at the same strike and the same expiry, pay both premiums up front, and make money only if Nifty travels far enough, up or down, to cover that combined cost. It looks like a heads-I-win, tails-I-win trade. It isn’t. What you’re really betting on is movement and volatility, and the usual way it bleeds money is a sleepy market, or option prices caving in right after the event you were waiting for. Below we build the trade on Nifty 50 options, work out its breakevens and rupee risk, look at why event trades so often disappoint, and set out the rules that keep the downside in check. If options are new to you, read our options trading for beginners in India guide first.

Educational content only. Not investment advice. All prices in the worked examples below are hypothetical and chosen to make the arithmetic easy to follow; they are not live market quotes.

The long straddle strategy on Nifty, explained

Zerodha Varsity’s chapter on the long straddle boils the trade down to three conditions. You buy one call and one put, and both legs share the same underlying, the same expiry and the same strike. On Nifty, that strike is usually the at-the-money (ATM) one, the strike closest to where the index is trading.

The ATM call carries a delta of roughly +0.5 and the ATM put roughly -0.5, so they cancel out and the position starts out close to delta neutral. Small wiggles in the index hardly move its value at first. What does move it is a big swing in either direction, a shift in implied volatility, and the plain passage of time.

Varsity sums up the payoff in three lines. Learn them by heart:

• Maximum loss is the net premium paid, and you take it if the index expires exactly at the strike.
• Upper breakeven is the strike plus the net premium.
• Lower breakeven is the strike minus the net premium.

Past the breakevens, profit is open-ended on the upside and very large on the downside. One leg keeps gaining, while the other can only lose the premium you’ve already paid.

How Nifty options are set up for this trade

Before putting numbers on a straddle, get the contract basics straight. They come from NSE’s Nifty 50 derivatives contract specifications:

• Nifty 50 index options are European style, so exercise happens only at expiry. You can still get out whenever you like by selling the options in the market.
• Weekly contracts expire on the Tuesday of the expiry week, and monthly contracts on the last Tuesday of the month. If that Tuesday is a trading holiday, expiry moves to the previous trading day.
• Strikes on weekly and monthly contracts are 50 points apart.

Lot size is what converts index points into rupees. NSE’s F&O market lots file shows a Nifty lot size of 65 units for the October 2026 contract and the expiries after it. Lot sizes get revised every so often, so check that file each time before you size a trade.

Building the straddle and finding its breakevens

Say, purely as an illustration, that Nifty is at 24,000 a few days before expiry. The 24,000 strike is at the money, and the quotes are:

• 24,000 call (CE): ₹180
• 24,000 put (PE): ₹170

Buying both costs 180 + 170 = 350 points. At a lot size of 65, one lot of the straddle costs 350 × 65 = ₹22,750. That’s the most you can lose, before brokerage, taxes and other charges.

Varsity’s formula gives the breakevens straight away:

• Upper breakeven: 24,000 + 350 = 24,350
• Lower breakeven: 24,000 – 350 = 23,650

So Nifty has to move 350 points from 24,000 by expiry just for you to get your money back. That’s 350 ÷ 24,000, or about 1.46% of the index, in either direction. Anything smaller and some of your premium is gone.

Payoff at expiry for one lot

This is the familiar V-shaped payoff. The loss is deepest right at the strike, shrinks as the index drifts away, and turns into profit only beyond the breakevens. Look at how wide the losing zone is, though. Here, every expiry level from 23,651 to 24,349, a band of nearly 700 points, ends in a loss.

A long straddle does not need you to be right about direction, but it does need the market to move more than the options were already pricing in.

Volatility matters more than direction

An option’s premium is intrinsic value plus time value, and time value leans heavily on implied volatility, which is the market’s estimate of how much the underlying will move. Varsity shows that a straddle gets more expensive as volatility rises and cheaper as it falls, whatever the time left to expiry. So a long straddle is really two bets rolled into one. You’re betting the index will move, and you’re betting implied volatility won’t drop before you get out.

For Nifty, the gauge most traders watch is India VIX. NSE’s India VIX page says the index is worked out from the best bid and ask prices of Nifty options and expresses expected market volatility over the next 30 calendar days as an annualised percentage. NSE’s computation note adds that it uses out-of-the-money near-month and mid-month Nifty option contracts.

Since VIX is annualised, traders often scale it down to a shorter window using the square root of time. As a rough illustration, a hypothetical VIX of 14 would imply a one-standard-deviation move of about 14 × √(30 ÷ 365) ≈ 4% over 30 days. It’s an approximation, nothing more. But it lets you set what the options are pricing against what you expect, and that comparison is the real decision in any straddle.

Event trades and the volatility crush

Most straddles get bought ahead of scheduled events: an RBI policy decision, the Union Budget, election results, or quarterly numbers from a heavyweight stock. The reasoning feels solid. Big news should bring a big move. The trouble is that everybody can see the event coming, so option sellers mark their prices up in advance and implied volatility climbs into the announcement.

Varsity puts what happens next bluntly. If the outcome is what the market expected, volatility “drops like a ball” once the news is out, premiums sink with it, and the straddle buyer has effectively bought at high volatility and sold at low volatility. Traders call this the volatility crush, or IV crush.

Right about the move, still losing money

Stick with the hypothetical 24,000 straddle, bought for 350 points the day before a policy announcement. The decision is in line with expectations and Nifty rises 150 points to 24,150. Next morning, with the uncertainty gone, the quotes could look like this:

• 24,000 CE: ₹255 (it picked up intrinsic value, but shed time value as implied volatility fell)
• 24,000 PE: ₹65 (it lost on both counts, from the move and from the drop in volatility)

The straddle is now worth 255 + 65 = 320 points. That’s a loss of 30 points, or ₹1,950 on one lot of 65, even though the index did move. The move was just smaller than what the premiums had already baked in, and the fall in volatility took care of the rest.

Varsity’s lesson is that an event straddle pays only when the outcome is a real surprise, one that moves the market much further than the consensus expected. Knowing that “something will happen” isn’t enough. You need a better read on the event than the market has.

Time decay is the cost of waiting

Both legs of a long straddle lose time value every single day. That’s theta decay. Varsity notes it speeds up sharply in the last week before expiry, which is why it warns against carrying at-the-money or out-of-the-money options into that final stretch. With weekly Nifty contracts expiring every Tuesday, a straddle bought late in the week gets only a few sessions for the move to show up, and each quiet day in between chips away at the premium.

Here’s a practical way to frame it. The breakevens at expiry tell you the minimum move you need if you hold to the end. If you plan to exit earlier, right after the event, the question changes: will the move plus any change in volatility be worth more than the time value you burn while you wait?

The best straddle setups combine relatively cheap volatility at entry with a catalyst that can surprise the market, and a holding period short enough that time decay does not win first.

When a long straddle can make sense

Put Varsity’s conditions together and the trade tends to work best when:

1. Implied volatility is fairly low when you enter, so you aren’t overpaying for the options.
2. Volatility is likely to rise while you’re holding.
3. A large move is expected, and you genuinely don’t care which direction it takes.
4. The move is expected soon, well before expiry.
5. Your view of how the event will play out differs meaningfully from the market consensus.

If you expect the reverse, a calm market with volatility drifting lower, the mirror-image trades are premium-selling structures like the iron condor on Nifty. Those have risks of their own, and our guide on debit vs credit spreads lays them side by side.

Risk rules we’d follow as straddle buyers

• Size by the premium. Your maximum loss is the whole premium, so decide beforehand how much of your trading capital a single straddle can risk. In the example above, one lot puts ₹22,750 on the line.
• Set the straddle price against your expected move. If you can’t make a case for Nifty moving more than about 1.46% in the time you have, as in the example, there’s no edge in the trade.
• Look at implied volatility before you enter. If VIX has already jumped ahead of an event, you’re buying expensive options.
• Plan your exit around the event. Plenty of traders close out soon after the news instead of nursing a decaying position to expiry and hoping for a late move.
• Use a time stop, not just a price stop. If the move hasn’t come by a day you’ve fixed in advance, get out and take a partial loss rather than letting theta eat the full premium.
• Count every cost. Two legs mean two rounds of brokerage, exchange charges and taxes, on the way in and on the way out, and wide bid-ask spreads on far expiries add a cost you don’t see on the contract note.

Remember the odds in F&O

Buying options caps your loss on each trade. It doesn’t make the segment easy. A SEBI study, reported by Business Standard, found that more than 91% of individual traders in equity derivatives lost money in FY25, and their net losses after transaction costs grew to ₹1,05,603 crore from ₹74,812 crore in FY24. The study looked at the top 13 brokers, with a combined base of about 96 lakh unique futures and options traders. Buying a straddle ahead of every event, with no edge on volatility, is one of the quieter ways losses like that pile up.

What to remember

• A long straddle on Nifty means buying the ATM call and the ATM put of the same expiry. The most you can lose is the net premium paid, and the breakevens sit at the strike plus and minus that premium.
• The index has to move more than the combined premium, about 1.46% in our hypothetical example, before the trade makes money at expiry.
• Implied volatility, tracked for Nifty by India VIX, can make or break the trade. A volatility crush after an event can turn a correct call on the move into a loss.
• Theta decay works against you daily, and fastest in the final week, so enter close to the trigger and know your exit before you go in.
• Check the current lot size in NSE’s market lots file and the expiry calendar before sizing any trade.

Disclaimer: This article is for information and education only and is not investment advice or a recommendation to buy or sell any security or derivative. Options trading involves substantial risk of loss. Consult a SEBI-registered investment adviser before making investment decisions.