Agora Circle
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Neutral4 LegsDefined risk

Iron Butterfly

Sell an at the money straddle and buy protective wings. A rich credit if the market pins the strike, with losses capped on both sides.

By Team Agora Circle

Written by the Agora Circle editorial team. Educational content, explained for the Indian market. Not investment advice.

Market outlook
Strictly neutral. You expect the underlying to finish very close to the central strike.
Setup
Sell 1 at the money call and put, buy 1 out of the money call above and put below.
Max profit
Limited to the net credit received for all four legs.
Max loss
The wing width minus the net credit. Fixed and known at entry.
Breakeven
Central strike plus the net credit above, minus the net credit below.
Implied volatility
Falling implied volatility helps strongly; the wings soften spikes.
Time decay
Strongly positive near the central strike as expiry approaches.

Strategy Overview

An iron butterfly is a short straddle with the tails clipped. You sell an at the money call and put for a rich combined premium, then buy a call above and a put below as wings. The credit is large because the short strikes sit exactly at the money; the wings turn the straddle's unlimited risk into a fixed number.

The payoff forms a tent with its peak at the central strike. Maximum profit needs the market to finish right at the strike, and profitability survives a drift of up to the credit in either direction. It is a precision instrument: narrower and richer than an iron condor, made for markets expected to pin a level.

Traders reach for the iron butterfly in the same conditions as the short straddle, expensive implied volatility and an expected standstill, but with a defined worst case and dramatically lighter margin, which brings the structure within reach of ordinary accounts.

How to Set It Up

Four legs at three strikes, one expiry, entered together for a net credit.

  1. 1Sell 1 call (CE) and 1 put (PE) at the at the money strike.
  2. 2Buy 1 call (CE) at a strike above the market as the upper wing.
  3. 3Buy 1 put (PE) at a strike equally far below as the lower wing, collecting the net credit.

Payoff Diagram and Example

Max Profit

Limited to the net credit received for all four legs.

Max Loss

The wing width minus the net credit. Fixed and known at entry.

Breakeven

Central strike plus the net credit above, minus the net credit below.

Iron Butterfly payoff diagram024,50025,00025,500BE 24,780BE 25,220Max loss -280ProfitLossNIFTY at expiry

Suppose NIFTY is at 25,000 ahead of an expected quiet expiry. You sell the 25,000 CE and 25,000 PE for 200 each, and buy the 25,500 CE and 24,500 PE for 90 each. The net credit is 220 points, or 220 x 75 = Rs 16,500 per lot.

If NIFTY expires exactly at 25,000, all the short premium is kept and the wings expire worthless: the full Rs 16,500. The breakevens sit at 24,780 and 25,220, so a 220 point drift either way still leaves the trade at least flat.

Beyond the breakevens, losses grow but stop at the wings: 500 points of width minus the 220 credit caps the damage at 280 points, or Rs 21,000, however violent the move. Compare that to the same straddle without wings, where a 1,000 point gap would cost triple.

Entering and Exiting

Enter as a single four leg order with a limit on the net credit. The at the money legs are liquid, but crossing four spreads still rewards patience over market orders.

Do not wait for maximum profit; expiring exactly on the strike is a coin toss you cannot control. Buying the structure back once 30 to 50 percent of the credit has decayed is the practical target that keeps results consistent.

If the index walks away from the central strike early, close the position while the loss is still a fraction of its capped maximum. The tent's slopes are steep, and mark to market moves faster than a condor's.

Time Decay (Theta)

With two short at the money options, the iron butterfly collects theta at nearly the fastest rate any defined risk structure can. The final week before expiry, with the index near the strike, is where the bulk of the profit accrues.

Away from the centre the decay advantage fades quickly, because one short leg is turning intrinsic. Time is only on your side while the market stays near the peak of the tent.

Implied Volatility (Vega)

The structure is firmly short vega: an IV crush deflates the expensive short straddle at its heart while barely moving the cheap wings. Selling inflated volatility ahead of its normalisation is the trade's natural habitat.

A volatility spike works the mischief in reverse, inflating the short legs against you, but the wings guarantee the damage can never exceed the fixed maximum, a mercy the naked straddle does not offer.

Common Adjustments

If the index drifts, the butterfly can be re-centred: close the current structure and rebuild it around the new price, banking or absorbing the difference. This is cleaner than leg by leg surgery.

Asymmetric adjustment is possible by rolling only the untested short leg toward the market, converting the position into a slightly directional variant with extra credit.

If the move is decisive, take the capped loss and move on. The structure was chosen precisely so that this moment costs a known, affordable amount.

Synthetic Equivalent

An iron butterfly is a short straddle with protective wings, or equivalently a bull put spread and a bear call spread that meet at the same central strike. Its payoff matches a call or put butterfly at the same strikes.

It is the defined risk version of selling an at the money straddle, trading some of the premium for a capped maximum loss.

Pros and Cons

Pros

  • Large credit relative to other defined risk neutral trades.
  • Maximum loss fixed at entry; no tail risk beyond the wings.
  • Very fast time decay near the central strike.
  • Far lighter margin than a naked short straddle.

Cons

  • Needs the market to finish near one precise level for the best outcomes.
  • Narrower profit zone than an iron condor.
  • Four legs bring meaningful transaction costs and slippage.
  • Steep mark to market swings when the index leaves the centre.

Frequently Asked Questions

Iron butterfly or iron condor, which should I trade?

The butterfly pays a bigger credit for a narrower target: it wants the market pinned at one strike. The condor pays less but wins across a wide band. Pick the butterfly when you expect stillness at a level, the condor when you merely expect a range to hold.

How does this differ from a short straddle?

The core is identical, short call and put at the money, but the bought wings cap the loss at the wing width minus the credit and cut the margin requirement to that same fixed amount. You give up part of the premium for the certainty.

What is the realistic profit target on an iron butterfly?

Expiring exactly at the strike almost never happens, so treat the maximum as theoretical. Most traders aim to capture 30 to 50 percent of the credit and exit, which happens frequently when the index stays near the centre while time value drains.

Where should the wings go?

Symmetric distances suit a genuinely neutral view; the width is a dial between credit and risk. Tight wings cost more premium but produce a small maximum loss, wide wings keep more credit with a larger worst case. Liquidity at round strikes usually decides the final choice.

Why did my butterfly lose value on a quiet day?

Check implied volatility: a rise inflates the short straddle at the heart of the position faster than the wings compensate, producing a paper loss with the index unmoved. It unwinds if IV settles back before expiry.

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This page is for education only. It is not investment advice, and nothing here is a recommendation to buy or sell any instrument. Options involve substantial risk, and option sellers can lose far more than the premium they receive. Please do your own research or consult a SEBI registered investment adviser before trading. Read our full disclaimer.

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