Reverse Iron Butterfly Calculator

By Yojana Mandon · Updated June 2026 · 3 min read · Risk disclaimer

A reverse iron butterfly (long iron butterfly) buys the at-the-money call and put and sells an out-of-the-money call and put as wings. It is a defined-risk, long-volatility trade: you pay a net debit and profit if the stock makes a decent move in either direction, with both the maximum profit and loss capped.

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Key characteristics

• Buy the ATM call + put, sell an OTM call + put (the wings): net debit.
• Profits on a move either way; loses if the stock pins the centre strike.
• Max loss = the debit; max profit = wing width − debit, reached at a wing.
• The tighter, sharper cousin of the reverse iron condor (single centre strike).

When to use a reverse iron butterfly

Open it when you expect a move but want a single, well-defined target on each side and the lowest cost — the sold wings finance much of the long straddle. It is the long-volatility, defined-risk way to say "I think this breaks out, but I don’t want to pay for an unlimited move".

Versus a reverse iron condor it has one centre strike instead of two, so it costs less and pays the most for a precise move to a wing, but its profitable zone is narrower.

The risk and the catch

The enemy is a flat stock. If price sits at the centre strike at expiration, the long straddle expires worthless and you lose the full debit — the defined maximum loss. Time decay works against you, so the move must come before expiration.

Because you are long volatility, avoid entering when implied volatility is already high (for example just before earnings): the post-event IV crush can erase the value even if the stock moves.

On the Greeks, the Reverse Iron Butterfly is vega-positive — rising implied volatility helps it, while an IV crush works against you, and theta-negative, so time decay erodes it and the move needs to come reasonably soon.

Managing the trade and common mistakes

Managing a reverse iron butterfly requires more active attention than most traders expect. Because you pay a net debit up front, theta works against you from day one — the ATM long options bleed faster than the short wings gain. Experienced traders aim to close the position when the underlying makes a sharp move and the trade reaches 50–80% of the width of one wing minus the debit paid, rather than waiting to capture the theoretical maximum. If the move comes quickly — particularly in the days after a catalyst — close the winning spread and the remaining structure together. Trying to leg out by selling only one side dramatically increases directional risk if the underlying reverses.

The most damaging mistake beginners make is entering the reverse iron butterfly when implied volatility is already elevated. Because the structure is net long vega, a crush in IV after you enter — the classic post-event collapse — can erase the gain from a correct directional move. Entry timing matters as much as directional opinion. A second common error is misreading the break-even points: the underlying must move beyond the long strike plus (or minus) the total debit paid to show any profit at expiration, which is a wider range than it first appears. Cutting the loss early — typically when the position has lost 50% of the premium paid — is almost always better than hoping the underlying reverses back into profitable territory.

On the expiration and assignment side, the two short wings carry real risk as expiration approaches. If the underlying rallies above your short call strike or drops below your short put strike, those legs are in-the-money and subject to early assignment on American-style options — particularly around ex-dividend dates for calls. Carrying the position into expiration with the underlying pinned near one of the short strikes is especially dangerous: you may face automatic exercise on the long ATM leg while your short wing is also in-the-money, resulting in an unwanted stock position. Closing the entire four-leg structure at least one day before expiration eliminates this risk cleanly. Liquidity is a practical concern too: always check the bid-ask spread on each leg individually and use limit orders on the entire spread to avoid a wide fill on a four-leg trade.

Calculate it live

Use the free OptionProfit Reverse Iron Butterfly calculator to load a live option chain, build the trade, and instantly see the payoff chart, breakevens, probability of profit, Greeks and a Monte Carlo simulation of outcomes.

Frequently asked questions

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