Risk Reversal Calculator & strategy guide

What is a risk reversal?

A bullish risk reversal, also called a combo or a split-strike synthetic, buys an out-of-the-money call and sells an out-of-the-money put on the same underlying and expiration. The short put finances most or all of the call, so the position is often opened for a small debit or even a credit. Above the call strike you gain like stock; below the put strike you lose like stock; between the strikes the position is flat and simply worth whatever was paid or collected.

The strategy takes its name from options market skew. Out-of-the-money puts typically trade at higher implied volatility than equidistant out-of-the-money calls because investors pay up for downside protection. A risk reversal sells the expensive side and buys the cheap side, which is why the trade can be cheaper than the stock-like exposure it delivers. Inverting the legs, selling a call and buying a put, creates the bearish version.

The payoff diagram is a flat line between the strikes, rising at 45 degrees above the call strike and falling at 45 degrees below the put strike. Compared with a synthetic long stock at a single strike, the gap between the strikes trades a zone of zero participation for a lower entry cost and a small buffer before losses begin on the downside.

Setup

Risk Reversal example

XYZ trades at $100 with 45 days to expiration. You buy the $105 call for $2.60 and sell the $95 put for $2.20. The net debit is $0.40 per share, or $40 per combo. Between $95 and $105 at expiration both options expire worthless and you simply lose the $40.

Profit is unlimited above the $105.40 breakeven and grows dollar for dollar with the stock. Between $95 and $105 the trade loses only the $40 debit. Below $95 the loss grows dollar for dollar and would reach $9,540 if XYZ fell to zero, so the risk is essentially that of owning stock from $95.

When to use a risk reversal

• You are bullish and want leveraged upside exposure with little or no premium outlay, and you are willing to own the stock at the put strike if it falls.
• Put skew is steep, meaning out-of-the-money puts carry noticeably higher implied volatility than calls, so selling the put pays for more of the call than usual.
• You expect a meaningful rally, not a small drift, since the call needs to move into the money before the position starts earning.
• You want an alternative to buying stock after a pullback: the short put sets a price where you are comfortable being assigned and the call captures a rebound.
• Typical entries use 45 to 90 days to expiration with both strikes 5 to 10 percent from the stock price, often chosen so the premiums roughly offset.

Risks to understand

• Downside is large and undefined. Below the put strike the position loses like 100 shares, so a crash produces a loss far exceeding the tiny debit or credit at entry.
• The flat zone between the strikes means the stock can rise several percent and the trade still loses the debit or earns only the credit, with no participation.
• Because the short put is usually placed on the expensive side of the skew, a spike in implied volatility during a sell-off inflates it quickly and widens mark-to-market losses.
• The short put can be assigned early once it is in the money, converting the position into actual shares and requiring the full purchase capital.
• Margin on the short put rises as the stock falls, so the trade demands more collateral precisely when the position is losing money.

Managing the trade

• Size by the notional value of 100 shares at the put strike, not by the small net premium, and use the same stop-loss discipline you would apply to a stock position.
• If the stock rallies through the call strike, the short put becomes cheap and can be bought back for pennies, leaving a plain long call with no downside risk beyond its value.
• If the stock falls toward the put strike and the thesis is intact, roll the put down and out to a later expiration for a credit, lowering the level where assignment would occur.
• Buying a further out-of-the-money put below the short put converts the open-ended downside into a defined maximum loss, turning the structure into a call plus a put credit spread.
• Close or roll before expiration if the stock is near the put strike, since assignment on the final day would leave you long shares over the weekend.

Risk Reversal FAQs

What is a risk reversal in options?

A bullish risk reversal buys an out-of-the-money call and sells an out-of-the-money put in the same expiration, giving stock-like upside above the call strike and stock-like downside below the put strike, with a flat zone between. The bearish version sells the call and buys the put. The term also refers to the implied volatility difference between those puts and calls, which is a common measure of skew.

How do you calculate the breakeven on a risk reversal?

For a bullish risk reversal opened for a debit, breakeven is the call strike plus the net debit. Buying a $105 call and selling a $95 put for a $0.40 debit gives a breakeven of $105.40. If the position is opened for a credit instead, it is profitable everywhere above the put strike minus the credit, because the credit is kept in the flat zone.

Is a risk reversal a good bullish strategy?

It is efficient when put skew is steep and you are willing to own the stock at the put strike. The cost is near zero and the upside is unlimited. The drawback is that it earns nothing until the stock clears the call strike and carries full downside below the put strike, so it suits traders with high conviction and the capital to accept assignment.

Risk reversal vs synthetic long stock: what is the difference?

A synthetic long uses the same strike for both options and tracks the stock everywhere. A risk reversal splits the strikes, creating a flat zone between them. The split lowers the entry cost and gives a buffer before downside losses begin, at the price of no participation in a modest rally. Both have unlimited upside and stock-like downside.

Can a risk reversal be opened for a credit?

Yes, and it often is when put skew is steep. If the $95 put brings in more than the $105 call costs, you collect the difference up front and keep it if the stock finishes anywhere between the strikes. The credit slightly widens the profit zone on the downside but does not change the fact that losses below the put strike grow dollar for dollar.

What happens to a risk reversal at expiration?

If the stock is above the call strike, the call is exercised and you buy 100 shares at that strike. If it is below the put strike, the put is assigned and you buy 100 shares at the put strike. If it finishes between the strikes, both options expire worthless and you keep the credit or lose the debit. Close the position before expiration if you do not want to end up holding stock.

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