AMZN calendar call spread: selling time twice

Same strike, two expiries. The short Aug 28 call decays on a steep curve; the long Sep 18 call decays on a shallow one. The difference between those two decay rates is the entire profit engine — which is why the position wants the stock to sit still.

Max profit occurs with AMZN pinned at $270 on August 28, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $549 against the $344 debit, which is also the maximum loss.

Calendars are LONG vega, unlike most short-premium trades. The back month has more vega than the front, so rising implied vol helps you. At 33% ATM on the front expiry, AMZN is the 14th richest of the 20 underlyings on this site — calendars are best opened when front-month vol is rich relative to the back.

Because the legs expire on different dates, there is no single expiry payoff: the numbers on this page are marked to model at the near expiry (August 28, 2026) using each leg's own implied vol — the same convention the builder uses.

Early assignment on the short call — particularly near an ex-dividend date — leaves you short 100 shares against a long back-month call. Manageable, but it turns a quiet position into a margin conversation.

Vol term structure can move against you: if back-month IV falls while front-month holds, the position loses on vega even with the stock exactly where you wanted it.

Implied vol can fall while the stock moves. Long-vol structures lose money in that scenario despite the thesis technically working, which is the single most common way these trades disappoint.

The term structure into an Amazon print is one of the steepest on this list, which makes the calendar the natural expression: sell the expensive front month, own the back. Straddles bought inside the front week are paying the peak of that curve.

AMZN's Aug 28 strikes are $5 apart near the money (1.84% of spot). On a ladder that wide, "pick the 0.30 delta strike" resolves to whichever rung happens to be closest — sometimes not close at all. 16k contracts of open interest on Aug 28 is workable around the money and thin in the wings — width costs more here than the ladder suggests. 23 strikes on that expiry — 50% of the board — carry prints that agree with their own implied volatility and hold up across the ladder, and those are the strikes priced here. Deep at every strike; the far-dated back month a calendar needs is liquid enough to leg if you must.

Skew is inverted: the 25-delta CALL implies 1.3% more vol than the put. That is the market pricing upside risk above downside risk — a squeeze, a takeover rumour, or a crowded short. Owning upside on an inverted skew means paying the expensive side of the surface, which is worth knowing before you buy the call. The term structure is flat inside 1.5% between the two captured expiries, so there is no calendar edge to harvest and no event visibly priced into one month over the other.

At 33% ATM implied vol, the Aug 28 options are pricing a one-standard-deviation move of $24.05 over 27 days — roughly −8.9% to +8.9%, or $247.53 to $295.63. Owning vol here means believing AMZN covers more than 8.9% in 27 days, and covering it in time.

What actually goes wrong here, as opposed to in general: Buying the holiday-quarter straddle because the narrative is loud. That print's implied move is usually the year's largest and usually adequate.