Reversal at a glance
| Construction | Short 100 shares, sell 1 at the money put, and buy 1 at the money call at the same strike, both options in the front month expiration. |
|---|---|
| Outlook | Market neutral |
| Volatility view | IV neutral |
| Max profit | Stock sale price minus strike plus put premium minus call premium, times 100, plus interest earned on the short sale proceeds, minus dividends owed and borrow fees. |
| Max loss | The same locked amount when it is negative. |
| Breakeven | There is no price breakeven, because the result does not depend on where the stock finishes. |
| Experience level | Advanced |
| Also called | Reverse conversion, Reversal arbitrage |
How a reversal works
A reversal pairs short stock with a synthetic long: the long call and short put at the same strike behave like owning shares, so they offset the short sale. At expiration you will buy back the shares at the strike, either by exercising the call or through assignment on the put. Your result is fixed: you sold the stock at the market price, collected the put premium, paid the call premium, and will repurchase at the strike. Interest earned on the short sale proceeds adds to that, while dividends owed and borrow fees subtract.
At expiration the payoff is a flat line wherever the stock finishes. Above the strike, you exercise the call and buy shares at the strike to cover your short. Below the strike, the put is assigned and you buy the shares at the strike. The locked value equals the stock sale price minus the strike plus the put premium minus the call premium, adjusted for carry. Because the edge in a reversal is usually small, every cost in the trade matters, including commissions and the bid ask spread on all three legs.
Before expiration, delta, gamma and vega are all close to zero. The reversal's real exposures are interest rates, dividends and stock borrow. Higher rates increase what you earn on the short sale proceeds, a dividend increase raises what you owe, and a stock that becomes hard to borrow can bring high fees or a forced buy in. On hard to borrow names, puts trade rich relative to calls for exactly this reason, so an apparent reversal profit often just reflects the borrow cost.
Reversal example with real numbers
With the stock at $100, implied volatility at 30%, a 4.1% risk free rate and no dividend, you would short 100 shares at $100.00, sell 1 100 put (32 days) at $3.39, buy 1 100 call (32 days) at $3.73. That is a net credit of $9,966. At expiration a maximum profit of $34.00 and a maximum loss of $34.00. The lognormal chance of profit is 0%.
These are theoretical American option prices from the Bjerksund and Stensland model, not live quotes. Load any ticker in the reversal calculator above to run the same math on real market prices.
When to use a reversal
- Puts are priced high relative to calls after you account for interest, dividends and borrow costs.
- You can borrow the shares easily and actually earn interest on the short sale proceeds.
- You want to lock in the value of an existing short stock position until expiration.
- You are studying put call parity and the cost of carry on the short side.
Max profit, max loss and breakeven
Maximum profit
Stock sale price minus strike plus put premium minus call premium, times 100, plus interest earned on the short sale proceeds, minus dividends owed and borrow fees. The amount is fixed at entry if no leg is exercised early.
Maximum loss
The same locked amount when it is negative. Further losses can come from early put assignment that cuts off interest income, an unexpected dividend increase, rising borrow fees, a forced buy in, or pin risk.
Breakeven
There is no price breakeven, because the result does not depend on where the stock finishes. The trade breaks even when the put premium minus the call premium equals the strike minus the stock price plus net carry (dividends and borrow fees minus interest earned).
Reversal Greeks
- Delta: Delta is close to zero, because the short shares are offset by the long call and short put.
- Gamma: Gamma is close to zero, as the long call and short put at the same strike have nearly equal gamma.
- Theta: Theta is small and mainly reflects interest earned on the short proceeds, minus dividends and borrow costs.
- Vega: Vega is close to zero, although the American early exercise premium on the short put creates a slight residual.
See the live numbers for your position in the Greeks tab of the calculator, or explore a single option in the options Greeks calculator.
Early exercise and assignment risk
The short put is the reversal's weak point. If the stock falls sharply, the put goes deep in the money, and once its time value drops below the interest a holder could earn on the strike price, early exercise becomes rational. Assignment makes you buy 100 shares at the strike, which covers your short stock and ends the trade early with the long call as a small leftover. You lose the interest you expected to earn on the short sale proceeds for the remaining time, and that interest is often where the reversal's edge came from.
Dividends also cut against the short side. As a short seller you owe every dividend paid while you are short, so a dividend increase after entry costs you directly. Your long call gives you a choice before an ex dividend date: if the stock has rallied and the call is deep in the money, exercising it covers the short before the ex date so you no longer owe the dividend, which can be worth more than the call's remaining time value. At expiration, pin risk at the strike can leave you unexpectedly long or short shares.
The calculator's Early exercise risk tab flags short legs that are likely to be assigned. For a single option, use the early exercise calculator or read how early exercise and assignment work.
Pros and cons
Pros
- Locked in value with almost no directional exposure.
- Benefits from higher interest rates on short sale proceeds.
- Reveals mispricing between puts, calls, and stock.
- Fixed payoff at expiration that is easy to model.
Cons
- Early put assignment can cut off the interest income the trade relied on.
- Requires borrowing shares, with possible fees, recalls and buy ins.
- Many retail accounts earn little or no interest on short sale proceeds.
- Small edges are easily lost to commissions and spreads.
How to manage a reversal
- Price the trade with the interest you actually earn on short proceeds, your borrow fee, and expected dividends.
- Monitor the short put after any sharp decline and plan for early assignment.
- Close the trade before expiration if the stock is near the strike.
- Confirm the shares are easy to borrow and check recall risk before entering.
Reversal FAQ
What is a reversal in options trading?
A reversal is an arbitrage position made of short stock, a short put, and a long call at the same strike and expiration. The options form a synthetic long that offsets the short shares, so the outcome at expiration is fixed. It is also called a reverse conversion.
When is a reversal profitable?
A reversal is profitable when puts are expensive relative to calls by more than your net carrying cost. That cost includes dividends owed and borrow fees, minus interest earned on the short sale proceeds. Many retail accounts earn little interest on short proceeds, which makes true reversal opportunities rare for individual traders.
Why is early assignment a risk in a reversal?
Early assignment is a risk because it ends the reversal before you have earned the interest the trade was priced to collect. Deep in the money short puts on American options are often exercised early when their time value is less than the interest on the strike. That outcome is more likely when interest rates are high.
What is the difference between a reversal and a box spread?
A reversal uses stock and two options, while a box spread uses four options and no stock. Both lock in a fixed value and trade interest rates rather than direction. A box avoids stock borrow, but on American style equity options it still carries early assignment risk.
Related strategies
Conversion
A conversion is a market neutral arbitrage position that buys 100 shares, buys an at the money put, and sells an at the money call at the same strike, locking in a fixed value at expiration no matter where the stock goes.
Box Spread
A box spread is a four leg options position that combines a bull call spread and a bear put spread on the same two strikes, so it is worth exactly the distance between the strikes at expiration.
Synthetic Long Stock
Synthetic long stock is a long call and a short put at the same strike and expiration, a combination that gains and loses almost exactly like 100 shares of stock.
Covered Put
A covered put is a position that sells 100 shares of stock short and sells one put option against them.
Educational tool, not financial advice. Calculations are theoretical and depend on your inputs; real fills, fees, early assignment and dividends can change results. Options involve risk and are not suitable for every investor.