Volatility and Range Strategies · Options Trading Guide
A calendar spread trades differences between expirations. Its value at the first expiry depends on what remains in the later option.
Build the time spread
A standard long call calendar buys a later expiration call and sells an earlier expiration call at the same strike. The expirations differ, so the position cannot be understood using one final intrinsic value diagram at the first expiry. The later call still has time remaining. Its market value must be estimated or observed.
Use explicit remaining values
Suppose the 100 strike later call costs $6 and the nearer call brings $2.50. Net debit is $350 for one standard calendar. At the first expiration the stock is $100 and the later call is quoted at $4.20. If the short call has no value and the later call is sold for that amount, gross profit is $70. If the later call is worth only $2.80, the result is a $70 loss. Both cases use the same stock price.
Separate the volatility assumptions
The two expirations can carry different implied volatilities. A volatility shock confined to the near term may affect the short leg more than a simple combined vega number suggests. Reprice each leg separately for several term structure scenarios. A calendar that benefits from ordinary time passage can still lose on a sharp move or a collapse in the later option’s value.
Control the transition
American style short calls can be assigned early. If assignment creates short shares, the later call does not automatically close them. Exercising the later call may sacrifice extrinsic value and requires operational planning. If the short option expires and the long option remains, the strategy has changed into a long call. Repeatedly selling new nearer calls is a sequence of new decisions, not a guaranteed recovery plan. Record each credit, closing debit and remaining exposure separately.
Try it yourself
A calendar costs $2.80 per share. At the first expiry the short call costs $0.20 to close and the long call can be sold for $3.60. What is gross profit?
Show the worked answer
Closing value is $3.60 minus $0.20 = $3.40. Subtract the $2.80 debit to obtain $60 per standard calendar.
Further reading
Educational material. Examples and rates are hypothetical, not trade recommendations. Product terms, eligibility and risks vary by venue and jurisdiction.
