Calendar Spread

For ATM calendars, calls and puts have nearly identical profit profiles. Choose based on liquidity and bid-ask spreads. Some traders prefer puts for bearish bias and calls for bullish bias, but at ATM strikes, the difference is minimal.

Early assignment converts your calendar into a stock position plus long option. For call calendars, you become short stock but still own the back month call. For put calendars, you become long stock but own the back month put. You can close the resulting position or hold depending on your view.

Calendars benefit from time decay and IV expansion with limited risk. Straddles require the stock to move significantly. Calendars profit from the stock staying put. They serve opposite purposes - calendars for neutral, straddles for expecting big moves.

No. Calendar spread maximum loss is limited to the net debit paid. This is a defined-risk strategy. However, you can lose 100% of your investment if the stock moves far from the strike.

Most calendars are held until 5-7 days before front month expiration, then rolled or closed. This typically means 2-4 weeks depending on when you entered. You should not hold through front month expiration due to gamma risk.

Consider theta differential (wider gap = more differential), vega exposure (wider gap = more vega), and cost (wider gap = higher debit). For pure theta plays, narrower gaps work. For IV expansion plays, wider gaps are better. 30-45 DTE front with 60-75 DTE back is a good default.

Convert to diagonal when you develop a directional bias. If you think the stock will drift higher, roll the front month to a higher strike. If lower, roll to a lower strike. This adds directional profit potential while maintaining time decay benefits.

Dividends can cause early exercise of short call options. If a dividend is approaching before front month expiration, monitor for early assignment risk. Deep ITM short calls are most at risk. You can roll or close before ex-dividend date to avoid.

Options include: 1) Close for a loss if the stock has moved significantly, 2) Roll to a new strike at the current stock price, 3) Add a second calendar at the new price level (double calendar), 4) Convert to a diagonal with directional bias. The right choice depends on your new outlook.

If earnings fall between your expirations, front month IV will be elevated relative to back month. You can profit from this if you structure properly (sell high IV front, buy lower IV back), but be aware that the stock can move significantly on earnings, hurting the position regardless of IV benefit.

Compare IV across expirations. Normal contango (upward sloping) is typical. Backwardation (inverted) often corrects quickly and provides edge. Calculate the IV differential between expirations and compare to historical norms. Enter when term structure favors your thesis.

Vega is not constant across time - it varies with DTE. Back month vega is higher but more stable. Front month vega is lower but changes faster. The net calendar vega depends on this differential. Understanding this helps predict how IV changes will affect your position.

Model portfolio under: 1) Stock moves of 1, 2, 3 standard deviations, 2) IV changes of +/- 10, 20, 30 percent, 3) Term structure shift to backwardation or steep contango, 4) Combination scenarios. Calculate portfolio P/L under each scenario and ensure survival.

Ratio calendars (selling more front than buying back) can create credit entries but add unlimited risk. Use only when you have strong conviction on stock location and are comfortable with naked option exposure. Typically only for experienced traders with sophisticated risk management.

Charm (delta decay) accelerates near expiration, causing ATM delta to shift rapidly as time passes. Vanna (delta-vega cross) affects how IV changes impact your delta. Near expiration, these second-order effects can cause unexpected position behavior. This is another reason to close before the final week.