A butterfly spread is a defined-risk options structure that profits if the underlying finishes close to a specific price at expiry. It has an attractive payoff diagram: a small maximum loss, a much larger maximum profit, and both known in advance.
The diagram is accurate. It also leaves out most of what determines whether a butterfly actually makes money. This article covers both.
How it is built
The standard long butterfly uses three strikes, equally spaced, all of the same type and expiry. Using call options:
Buy one call option at a lower strike.
Sell two call options at the middle strike.
Buy one call option at a higher strike.
The same shape can be built with put options, with the same result at expiry. The middle strike is where you expect the price to finish. The distance between strikes is the width of the wings.
Because the two bought options cost more in total than the two sold options bring in, the position costs money to open. That net debit is the maximum you can lose.
A related structure, the iron butterfly, sells a call option and a put option at the middle strike and buys protection above and below. It collects money upfront instead of paying it, and has the same general shape. It is closely related to the iron condor, with the two sold strikes brought together into one.
In both versions the logic is identical: you are paid for being right about where the price will be, and the outer legs cap what you can lose if you are wrong.
A worked example
Suppose an index is at 24,000. Illustrative prices for options expiring in two weeks:
Buy the 23,800 call option at 290.
Sell two 24,000 call options at 170 each, receiving 340.
Buy the 24,200 call option at 85.
Net cost: 290 + 85 − 340 = 35 points per unit. Multiply by the lot size for the rupee figure.
At expiry, if the index is below 23,800, all options expire worthless. Loss: 35.
At expiry, if the index is exactly 24,000, the 23,800 option is worth 200 and the others are worth nothing. Profit: 200 − 35 = 165.
At expiry, if the index is above 24,200, the gains and losses across the legs cancel out. Loss: 35.
Breakevens are 23,835 and 24,165 — the lower strike plus the cost, and the upper strike minus the cost.
On paper, risking 35 to make up to 165 looks excellent. But the maximum requires the index to finish at one specific level, and the profit falls away quickly on either side. The probability of finishing near the middle strike is low, which is exactly why the position is cheap. The favourable ratio is the price of a narrow target, not a free advantage.
Why it earns little until close to expiry
The payoff diagram shows the result on expiry day. Most traders look at the position long before that, and are surprised.
With two weeks remaining, even if the index sits exactly at 24,000, the butterfly in the example might be worth only slightly more than it cost. The sold middle options still have substantial time value, which offsets most of the gain in the bought lower option. The large profit shown in the diagram only appears as time value drains out of the middle strike, which happens mostly in the final days.
This has three practical consequences.
Patience is required. A butterfly is a bet on the price being in a place at a time. Closing early usually captures a small fraction of the maximum.
The final days carry the most sensitivity. Near expiry, small movements of the index around the middle strike cause large swings in the position's value. The position that was quiet for ten days becomes very active in the last two.
Volatility works for you, then against you. A long butterfly generally benefits if implied volatility falls and suffers if it rises, because the sold middle options are the most sensitive to volatility. A sudden rise in volatility can reduce the position's value even with the index unchanged.
Costs, fills and the honest assessment
Four legs, four sets of charges. Brokerage, exchange charges, taxes and the bid-ask spread apply to each leg on entry and again on exit. With a maximum profit of 165 points and a realistic profit much smaller, costs across eight transactions can take a large share of the result. Calculate them before entering, not after.
Fills on the outer strikes. The wings are often less liquid than the middle strike. Placing all legs as a single basket order where your broker allows it avoids holding a partial structure. Entering leg by leg can leave you briefly with a very different position.
Adjustments add cost and complexity. If the index moves away from the middle strike, the temptation is to add or move legs. Each adjustment adds charges and can turn a defined-risk position into something harder to reason about.
The honest assessment: a butterfly is a precise tool for a precise view. It suits a situation where you have a specific reason to expect the price to settle near a level at expiry and want a cheap, capped way to express it. It is not a general-purpose income strategy, and its attractive reward-to-risk ratio reflects a low probability of full success rather than an edge.
An account with basket orders
Enter a four-leg structure in one go instead of leg by leg. Free to open
Prices in the example are illustrative, not market data. Lot sizes, margin rules and charges are set by the exchanges and SEBI and change from time to time. This is educational material, not advice, and no position is recommended. We run no tips group and no signal service, we manage nobody's money, and no return is promised. Derivatives can lose more than the amount blocked against them.
Disclosure: the account-opening link on this page is under Atul Shrivastava's Zerodha Authorised Person registration (NSE AP Reg: AP2516003481; Zerodha Broking Ltd. SEBI Reg: INZ000031633) and earns a revenue share. TheFinBaba is not a SEBI-registered Investment Adviser — this content is educational, not investment advice.
Frequently Asked Questions
What is a butterfly spread?
A three-strike options structure: buy one option at a lower strike, sell two at a middle strike, and buy one at a higher strike, all with the same expiry. It profits most if the underlying finishes at the middle strike, with maximum loss limited to the net cost.
What is the maximum profit and loss on a long butterfly?
Maximum loss is the net cost paid. Maximum profit is the distance between strikes minus that cost, reached only if the underlying finishes exactly at the middle strike on expiry.
Why does my butterfly show little profit even when the price is at the middle strike?
Because the sold middle options still hold time value, which offsets most of the gain. The large profit on the payoff diagram only appears as that time value drains away, mostly in the final days before expiry.
What is the difference between a butterfly and an iron butterfly?
A long butterfly uses options of one type and costs money to open. An iron butterfly sells a call option and a put option at the middle strike and buys protection on both sides, collecting money upfront, with a similar overall shape.
Is a butterfly spread a good strategy for beginners?
It has limited risk, but it needs a precise view, patience until expiry, and careful handling of four legs and their costs. Beginners are usually better served by learning single options and vertical spreads first.
Related Reading
- The options course for Vadodara
- The iron condor, a wider cousin
- Vertical spreads to learn first
- Why the middle strike dominates
- How volatility changes the position
- What happens in the final session
Disclaimer: TheFinBaba provides educational content only - this is not investment advice. Trading involves risk of loss.
