Early assignment around ex-dividend is rarer than the thread

Every covered-call thread in ex-dividend week has the same scare: you will be assigned early, lose the dividend, and wake up to a stock sale you did not want. American calls can be exercised any day. The scare is not imaginary. It is also not the default. Early exercise throws away remaining time value. A rational long call holder does that only when the thing they catch — usually a discrete dividend — is worth more than the time value they burn.

This post prices that comparison on the 1 August 2026 KO chain (15-minute delayed). There is no discrete ex-dividend date on the snapshot, so the dividend side is the engine’s continuous yield q = 1.2% over the 48 days to 18 September — the same q every probability on this site uses — not a declared KO coupon. That is an honest limitation and it is stated everywhere the number appears. Every figure is in lib/blog/figures.ts.

The call that would actually get exercised

KO is $87.59. The $85 call last-traded at $4.35. Intrinsic is $2.59, so $1.76 is still time value — $176 on one contract. The engine’s dividend over those 48 days is $0.14 a share, $14 on the lot. Time value minus that dividend: $162. A long holder who exercises today to catch the modeled dividend throws away $162 they could have kept by selling the call instead. Early exercise is not rational on this quote.

Open the same covered call in the builder: KO 18 Sep $85 call. Chance the call finishes in the money at expiry is 64.8% — that is expiration assignment, which is the ordinary kind, covered in covered call assignment: getting called away.

When early exercise *is* rational

The rule of thumb is older than this chain: a long American call may be exercised just before the stock goes ex-dividend when the expected dividend is larger than remaining extrinsic. Selling the call would not carry the dividend (the long call is not the stock). Exercising turns the call into stock in time to be the holder of record. The price of that conversion is whatever time value was left.

• Deep in the money, little time left, fat coupon. Extrinsic has already decayed toward zero; a $0.50 dividend on a $0.10 time-value call is a gift.
• Hard-to-borrow stock. Borrow fees on the short stock a market maker hedges with can make holding the long call overnight more expensive than exercising. That is a professional-desk fact, not something this delayed last-trade snapshot can show.
• Puts, almost never for the dividend. Dividends pull call early-exercise toward yes and put early-exercise toward no. A short put is assigned early when remaining put time value is smaller than the interest on the strike (the cash the put holder would rather have). On liquid names that bar is high.

None of those three is visible as a flashing number on a 15-minute delayed last-trade. What is visible is the last minus intrinsic. If that residual is larger than any dividend you can point to, the scare is louder than the arithmetic. If it is smaller, treat early assignment as a live branch and decide whether you wanted the sale.

What actually happens if you *are* assigned early

The broker event is identical to expiration call-away, just on a random Tuesday. The short call disappears. You sell 100 shares at the strike. Cash in is strike times 100. The credit you already collected still attaches, so effective proceeds are strike plus that credit. You do not receive the dividend on stock you no longer own. That last sentence is the whole of the ‘lost dividend’ complaint, and it is true: you sold the stock. The dividend belongs to the buyer.

1. 1Do not invent a second fill. Early assignment is not a close at intrinsic plus a stock sale. It is exercise. One stock trade at the strike.
2. 2Do not book a ‘dividend loss’ as options P/L. The dividend you will not receive is a consequence of not owning the shares. It is not an extra debit on the call.
3. 3The cycle continues or closes the same way. If the shares came from a put, call-away — early or at expiry — realizes the lot against adjusted basis. Option assignment: what actually happens is the put-side fill.

If you wanted to keep the shares through the dividend, the decision was earlier: buy back the short call before the ex date, paying whatever extrinsic plus intrinsic the chain asks, or never have sold a call that was this close to the money into that week. That buy-to-close is a new trade. Log it as a close. Rolling options: when and how is the mechanic if you replace it with a later expiry.

What this snapshot cannot tell you

A frozen chain with a continuous yield is the wrong microscope for a discrete ex-dividend. KO pays a real coupon on a real calendar. This page does not have that date, so it does not pretend to. What it can say, and what it does say, is that on 1 August 2026 the $85 call still had $1.76 of time value while the engine’s 48-day dividend was $0.14. Anyone announcing that early assignment is ‘likely’ on this quote is arguing with $162 of leftover premium. Re-price the same strike the morning before an actual ex-date; if extrinsic has decayed under the coupon, the inequality flips and the scare is finally the arithmetic.

Pin risk at expiration is a different animal and does not need a dividend. Stock closes a few cents around the strike, OCC assignment is lottery-like at the margin, and Monday you may or may not own the shares. Record what happened at $0.00 if the call expired, or at the strike if it was exercised. Mixing those into a blended fill is how a history stops matching the broker.

Short puts around ex-dividend are the wrong panic. Dividends make calls more likely to be exercised early and puts less likely. Interest on the cash a put holder would receive at the strike is the put-side analogue, and on this KO $85 put (last $1.55, out of the money) there is no intrinsic to even start the conversation. Early put assignment into a name you wanted to own is usually a gift of shares at the strike you already agreed to, plus you keep the credit. Cash-secured put vs buying the stock is that comparison without the ex-div folklore.

How a tracker should book it

Early or at expiry, call-away is a stock sale at the strike with the call credit already in the lot. A $0.00 expiry is a $0.00 expiry. A buy-to-close to dodge an ex-date is a close at the price you paid. Three events, three rows. Collapsing them into ‘the call went away’ is how cost basis and the next wheel put silently fork from the brokerage statement.

Writing the next call from shares you still hold is covered calls on shares you already own. If the lot came from an assignment, the call belongs on that cycle so the basis keeps moving. If you were called away, the cycle is done and the cash is waiting on a new put. That continuity is the product; the scare is a week on the calendar.