Reverse Iron Butterfly: Long Vol, Defined Risk

Key Takeaways

• A reverse iron butterfly buys a call spread and a put spread centered on one strike, for a net debit.
• Maximum profit is the body-to-wing distance minus the debit; maximum loss is the debit paid.
• It behaves like a long straddle with the cost lowered by selling the outer wings.
• The payoff matches the long iron butterfly; the two terms describe the same long-volatility position.

What It Is

A reverse iron butterfly consists of buying a bull call spread and a bear put spread whose long options sit at the same central strike, all with the same expiration. You buy the at-the-money call and put, then sell an out-of-the-money call and put as the wings.

Because the body options you buy cost more than the wings you sell, the position opens for a net debit. That debit is the most you can lose. In payoff terms it is identical to a long iron butterfly, so always specify the legs.

The Intuition

A credit iron butterfly profits when a stock pins to the center strike. The reverse version wants a breakout. You buy the at-the-money straddle for its sensitivity to movement, then sell the wings to cut the cost.

The wings cap how much you can make but make the bet cheaper than a bare straddle. You pay a defined amount in exchange for a payoff that rises as the stock leaves the center in either direction.

How It Works

You pay a net debit to open. The most you can lose is that debit, which happens if the stock finishes exactly at the central body strike, leaving all four options worthless.

The most you can gain is the distance from the body strike to a wing strike, minus the debit, reached if the stock moves past a wing. The formulas:

Net debit = cost of body options - credit from wing options
Max loss  = net debit paid
Max profit = (body-to-wing distance) - net debit
Lower breakeven = body strike - net debit
Upper breakeven = body strike + net debit

The position is positive vega. A rise in implied volatility lifts the value of the long body options, which can help even before the stock has moved.

Worked Example

A stock trades at 100. You buy the 100 call and the 100 put as the body, then sell the 105 call and the 95 put as the wings, all the same expiration. Suppose the net debit is 3.50 per share.

The body-to-wing distance is 5 points. Maximum profit is 5.00 minus 3.50, which is 1.50 per share, or 150 dollars. Maximum loss is the 3.50 debit, or 350 dollars, realized only if the stock sits exactly at 100 at expiration.

The lower breakeven is the body strike minus the debit, 100 minus 3.50, which is 96.50. The upper breakeven is the body strike plus the debit, 100 plus 3.50, which is 103.50. The stock must clear one of those levels to profit.

Common Mistakes

1. Treating it as different from a long iron butterfly. The two have the same payoff. Anything written about one applies to the other. Only the labeling differs.

2. Buying when volatility is high. A rich debit raises the breakevens and exposes you to a drop in implied volatility. The trade is best opened when premium is cheap.

3. Underrating the required move. Each breakeven sits a full debit away from the center. The stock often needs to move more than it appears at first glance.

4. Accepting a poor reward-to-risk. In the example you risk 3.50 to make at most 1.50. The bet only pays if a meaningful move is genuinely likely.

5. Holding into a pin. If the stock settles near the body strike as expiration nears, the position decays toward maximum loss. Many traders exit before pinning risk peaks.

Frequently Asked Questions

What is a reverse iron butterfly in simple terms? A reverse iron butterfly is a four-option trade you pay to enter, and it profits when the stock moves sharply away from a center strike. If the stock pins at the center, you lose what you paid.

How does a reverse iron butterfly affect investment decisions? It is a defined-risk way to be long volatility around a single price, often used before a known event. Because it is positive vega, rising implied volatility can help even before the move arrives.

What is a real-world example of a reverse iron butterfly? On a stock at 100, buying the 100 call and 100 put while selling the 105 call and 95 put for a 3.50 debit profits if the stock clears 96.50 or 103.50.

How can investors use a reverse iron butterfly effectively? Open it when implied volatility is low so the debit is small, set breakevens within a move you think likely, and consider exiting on a volatility spike rather than holding to expiration.

How is a reverse iron butterfly different from a reverse iron condor? A reverse iron butterfly centers both long options at one strike, so its loss point is a single price. A reverse iron condor spreads the long options across two strikes, widening the loss zone but lowering the cost.

Sources

1. The Options Guide. "Reverse Iron Butterfly." https://www.theoptionsguide.com/reverse-iron-butterfly.aspx
2. Fidelity Learning Center. "Long Iron Butterfly Spread." https://www.fidelity.com/learning-center/investment-products/options/options-strategy-guide/long-iron-butterfly-spread
3. Cboe Options Institute. "Mastering Options Strategies." https://pdf4pro.com/view/mastering-options-strategies-cboe-5b3b00.html
4. Rhoads, R. (Cboe). "Butterflies, Condors and Broken Wings." https://www.interactivebrokers.com/webinars/CBOE_Condors_Butterflies_Nov_2010.pdf

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.