KO calendar call spread: selling time twice

$87.59Coca-Cola Company · chain snapshot captured Aug 1, 2026

Low realized vol, a reliable quarterly dividend, and IV that usually sits in the mid-to-high teens. Premium sellers get paid little per contract here — the trade is about total return on a share position you were going to hold anyway.

A calendar sells the Aug 28 $90 call and buys the same strike Sep 18 — $53 debit on KO at $87.59. You are not betting on direction; you are betting that the 27-day option decays faster than the 48-day one you own, which it does, as long as KO stays near $90.

The trade, priced from the chain

27d to August 28, 2026

Leg	Qty	Price	Δ	IV	Cash
SellAug 28 $90 call	1	$1.26	0.34	21%	+$126
BuySep 18 $90 call	1	$1.79	0.38	21%	−$179

Net debit

$53

Max profit

$138

Max loss

$53

Chance of profit

51%

Breakevens

$86.26 / $94.9

−1.5% / +8.4%

$83.23 – $97.93 price rangespot $87.59breakeven $86.26 · $94.9P/L at near expiry

Open this calendar call spread in the builderLoads these exact legs and re-quotes them live. No account needed.

Every leg above is priced at the chain’s own quote — the identical number the builder will show you when you click through (last traded price), captured August 1, 2026 with a 15-minute delay. Only strikes whose print survives an implied-volatility check (within 20% of its own IV) and a no-arbitrage check across the ladder are priced here. Full methodology. Greeks, breakevens, max profit/loss and probability of profit are computed by OptionTracker’s engine at r = 4.2%. Educational analysis, not investment advice.

How a calendar call spread works

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 KO pinned at $90 on August 28, 2026: the short call expires worthless and you still own a 21-days-longer call. The engine values that peak at $138 against the $53 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 21% ATM on the front expiry, KO is the 18th 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.

When it makes sense

You expect KO to go quiet for 27 days and then move — the classic pre-catalyst setup.
You want a defined-risk long-vega position. Max loss is the $53 debit.
You want to own the back-month call eventually and would rather be paid to wait for it.
You have a view on volatility itself, expressed as a number, not just a feeling that something is about to happen.

Where the risk actually is

Early assignment on the short call — particularly near an ex-dividend date (KO goes ex on September 15, 2026) — 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.

What is different about doing this on KO

The cheapest vol on this list in points, and still not cheap relative to what the stock does. Long straddles here are a study in theta: the implied move over a month is a couple of percent, and the position needs most of that just to cover the debit.

KO's Aug 28 strikes are $1 apart near the money (1.14% of spot). Enough rungs to express a view, few enough that each one moves the economics visibly. 5.5k contracts of open interest on Aug 28 is thin, and a structure that needs four separate fills will pay for it. 21 strikes on that expiry — 40% 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. Reasonable at the near strikes; the wings are quiet enough that a four-leg structure is not worth the slippage.

The surface is close to flat: only 0.5% between the 25-delta put and the 25-delta call. With so little skew, the wings on either side cost about the same in vol terms — unusual, and worth exploiting if your view is one-sided. 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 21% ATM implied vol, the Aug 28 options are pricing a one-standard-deviation move of $5.08 over 27 days — roughly −5.8% to +5.8%, or $82.51 to $92.67. Owning vol here means believing KO covers more than 5.8% in 27 days, and covering it in time.

What actually goes wrong here, as opposed to in general: Chasing yield by moving the short call closer to the money on a name whose whole appeal is that you keep the shares.

Picking the strike on KO

The strike is your forecast for where KO sits on August 28, 2026, and the expiry gap sets how much time you're buying:

Band	What it means	When it fits
ATM strike	Maximum time-decay differential	The neutral construction, quoted above at $90.
OTM call strike	A directional lean upward	Cheaper, profits if the stock drifts toward the strike by the near expiry.
Narrow expiry gap	Front and back close together	Smaller debit, smaller edge. Decay differential needs room to work.
Wide expiry gap	27d vs 48d here	More vega, more debit, more exposure to term-structure moves.

The chain below shows the Aug 28 calls. Compare the ATM IV there with the back month: if the front is not richer, the calendar's core edge is missing.

Across the nine rungs below, the premium runs 14.5× from the cheapest strike to the richest — that curve is the whole strike-selection decision, drawn. Open interest concentrates at $90 on this expiry, which is usually where the fills are cleanest.

KO 2026-08-28 calls around the money: strike, distance from spot, mid price, delta, implied volatility and open interest.
Strike	vs spot	Mid	Δ	IV	% of spot	Ann.	OI
$86	−1.8%	$3.19	0.63	23%	3.6%	49%	71
$87	−0.7%	$2.21	0.56	22%	2.5%	34%	105
$88	+0.5%	$2.00	0.49	22%	2.3%	31%	121
$89	+1.6%	$1.55	0.41	22%	1.8%	24%	238
$90used	+2.8%	$1.26	0.34	21%	1.4%	19%	418
$91	+3.9%	$0.92	0.27	21%	1.1%	14%	100
$92	+5.0%	$0.69	0.21	21%	0.8%	11%	75
$93	+6.2%	$0.45	0.17	22%	0.5%	7%	69
$95	+8.5%	$0.22	0.10	22%	0.3%	3%	22

KO calls expiring August 28, 2026· 15-min delayed capture · “Ann.” annualizes the mid as a percentage of spot over 27 days.

Managing the position

Roll the short call out for a credit when it expires worthless — that converts the position into a diagonal and reduces basis on the long call.
Watch the short leg through ex-dividend dates and the last week — assignment there is the most common way a calendar breaks.
Enter long vol before the crowd and exit into the bid. The reliable money in owning volatility comes from the ramp in implied vol, not from the realized move after it.
Never plan to hold an ATM long-vol position through the last week. Theta on the final stretch is the steepest part of the curve and it does not care about your thesis.

Common mistakes

Opening calendars with a flat term structure

If the Aug 28 and Sep 18 expiries carry the same IV, you are paying for time without buying an edge.

Forgetting the legs expire separately

On August 28, 2026 you still own a Sep 18 call. That is a position, and it needs a plan of its own.

Buying vol without a view on vol

Owning a straddle because the chart looks coiled is a directional trade with worse odds. The question is whether implied is cheap relative to what the stock will realize, and that needs a number.

KO calendar call spread FAQ

What is the max loss?

The $53 debit. It is realized when KO moves far enough in either direction that both calls converge in value at the near expiry.

Why does this page show a modelled payoff instead of an expiry payoff?

Because the legs expire on different dates — August 28, 2026 and the Sep 18 expiry. The engine marks the position to model at the near expiry using each leg's own implied vol, which is the only honest way to draw a calendar's P/L.

How much is KO expected to move by Aug 28?

The Aug 28 options imply a one-standard-deviation move of $5.08 — about 5.8% of the KO share price — over the 27 days to expiry. That is the market's estimate, not a forecast: roughly a third of the time the actual move is larger.

Is KO option skew favouring puts or calls?

Neither, materially. The 25-delta put and call are within 0.5% of each other on the Aug 28 chain, which is an unusually flat surface for a US equity.

Build it yourself

Everything above is one construction at one moment. Open it in the builder to drag strikes along the ladder, scrub the expiry, and watch max profit, breakevens and probability of profit recompute live against the real KO chain — free, no account.

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