Calendar Spread

At ATM strikes, call and put calendars have nearly identical profit profiles due to put-call parity. The choice often comes down to slight directional bias (calls if slightly bullish, puts if slightly bearish), dividend considerations (calls can be assigned early for dividends), or liquidity/pricing differences.

Calendar spread breakevens depend on the value of the back-month option at front-month expiration, which depends on IV at that future date. Since future IV is unknown, breakevens can only be estimated. This is why calendars are managed by P&L percentage rather than price targets.

If the stock is at the strike, the front-month expires worthless and you're left with the back-month option. If ITM, the short is assigned (you're short stock if calls, long stock if puts) and you still hold the back-month. This creates complex positions - close by 7 DTE to avoid.

Typical target is 25-50% of max potential profit, which translates to roughly 15-40% return on capital at risk. Max profit occurs only if the stock pins exactly at strike. Most traders close at 25-50% profit to avoid pin risk.

If the stock moves significantly (5%+), the calendar loses value. Options: close for a loss, roll the strike to the new price (if still expecting range behavior), or convert to a diagonal spread if you have a directional view.

If the stock goes ex-dividend between expirations with the front-month call ITM, early assignment risk increases. The short call may be assigned the night before ex-div to capture the dividend. Either use put calendars to avoid this or be aware of the assignment possibility.

Roll if: stock is near strike, you want to maintain the position, and you can roll for acceptable cost (ideally credit or small debit). Close entirely if: stock has moved significantly, your thesis has changed, or the roll cost is too high. Rolling extends capital commitment.

Options: 1) Close at loss and reassess, 2) Roll to new strike following the stock, 3) Convert to diagonal by selling front-month at different strike while keeping back-month, 4) Add a calendar at new strike (double calendar). Each has trade-offs.

Calendars benefit when vol-of-vol is low and IV trends higher. High vol-of-vol (unstable IV) makes calendars risky because sudden IV changes affect the spread. Low vol-of-vol with a gradual IV increase is ideal.

Weeklies allow more precise expiration targeting and frequent rolling. You can create 7-day calendars, roll more frequently, or fine-tune around events. However, transaction costs increase with more frequent rolling, and liquidity may be lower.

Identify the earnings-month 'kink' where that expiration has elevated IV. Sell the pre-earnings expiration (high IV) and buy just-post-earnings (lower IV but still elevated). Capture the IV crush differential, or use the post-earnings month as back-month for an IV expansion play into the event.

Research suggests 1:2 to 1:3 time ratio (e.g., 30 DTE front, 60-90 DTE back) balances theta differential capture with capital efficiency. Too little gap (<21 days) means insufficient differential; too much gap (>60 days) ties up capital in slow-decaying back-month.

Measure net vega per dollar at risk and aggregate across all calendars. Compare to other portfolio positions. If total portfolio is long vega, calendars add; if short vega, calendars hedge. Set portfolio vega limits and rebalance when exceeded. Consider vega/theta ratio for efficiency.

Quantitative signals: IV Rank < 30%, term structure slope < 3% (near flat), historical IV < implied IV (suggesting mean reversion), realized vol < implied (expecting continued low movement). Combine with technical range confirmation and absence of upcoming events.

Buy 12-18 month LEAPs at slight OTM strikes on stable large-caps. Sell monthly front-month options against them at same or different strikes (diagonals). Target collecting 50-100% of LEAP cost in total premium over 6-12 months. Manage based on delta and roll monthly.