The dates that should veto a trade
Before you sell a 45-day option, look at what is scheduled inside those 45 days. An earnings print is the one date worth a hard veto, because the premium that makes the contract attractive is mostly payment for that event. The ex-dividend veto is taught more often and fires far less.
Two calendar checks, and they deserve very different amounts of your attention.
The earnings veto, priced
The top-ranked contract on one 60-name screen: RIVN at $13.40, the April 17 $15 call, 45 days out, 62 percent implied volatility, paying $61. That is 37.1 percent annualized, four times the next-best name on the list.
Reprice the identical contract at the 44 percent volatility that name carries when no print sits inside the window.
| Implied volatility | Model value | Credit | Annualized |
|---|---|---|---|
| 62%, print inside the window | $0.612 | $61 | 37.1% |
| 44%, no print | $0.313 | $31 | 19.0% |
| The date itself | $0.299 | $30 |
Half the credit is one afternoon.
Which reframes the trade. You are not being paid 37 percent annualized to sell a covered call. You are being paid 19 percent to sell a covered call and another 18 to underwrite a binary event with a spread of outcomes nobody at your desk can handicap. Take that deal if you want. Do not take it by accident because the screen sorted it to the top.
It is not one contract, it is most of them
On the same screen, 19 contracts cleared every liquidity and return filter. Twelve of them had earnings inside the window.
That is the finding worth carrying away. In any 45-day window, roughly a third of the market is reporting, and the names reporting carry elevated implied volatility for exactly that reason. So a screen ranked by annualized return is, most of the time, a ranked list of upcoming earnings dates. The filter that removes them is one line and it drops nearly two thirds of the shortlist.
What happens to the ones you keep is the other half. Implied volatility on a name that just reported collapses within a day, which for a seller is the best possible outcome and is worth understanding before you rely on it. Selling the day after a print, into a chain that has already deflated, is a genuinely different trade from selling into the run-up. Cluster D works through both sides.
The ex-dividend veto, and why it almost never fires
Standard advice: avoid an ex-dividend date inside your window, because the holder of your short call may exercise early to capture the dividend.
True, and much narrower than it sounds. Early exercise for a dividend only makes sense when the call is in the money, because exercising means buying the stock at your strike. Nobody pays $64 for a $58 stock to collect $0.41. The comparison is dividend against the remaining time value, and it only comes into play on a contract that has already gone against you.
Run it on the position. CSCO with a $0.41 quarterly dividend, ex-date April 3, and a short $64 call expiring April 17.
| Stock | Days left | Time value | Against $0.41 | Holder's move |
|---|---|---|---|---|
| $58.40, where it started | 14 | $0.07 | out of the money | nothing to exercise |
| $61.50 | 9 | $0.29 | out of the money | nothing to exercise |
| $65.20 | 15 | $1.01 | time value wins | hold the call |
| $66.50 | 7 | $0.26 | dividend wins | exercise |
| $67.50 | 7 | $0.15 | dividend wins | exercise |
The veto needs three things at once: the stock through your strike, the ex-date close to expiry, and a dividend larger than what is left of the time value. On a 0.20 delta call sold 45 days out, all three land together rarely. The screen dropped exactly one contract in nineteen on this filter.
So do not treat it as a hard veto. Treat it as a date to check late, when the position has moved against you and the ex-date is a week away. OCC / Options Industry Council, Options Assignment FAQ puts it plainly: assignment risk rises just before an ex-dividend date on short calls, and just after one on short puts. Cluster G runs the full comparison.
The other dates on the calendar
Worth a veto, if you can find the date. An FDA decision date on a biotech. A scheduled court ruling. A lockup expiry on a recent listing. Each of these is a single day with a wide distribution and a premium that already reflects it, and none is priced as generously as the seller assumes.
Not worth much. Investor days, conference appearances, index rebalances, analyst days. The chain barely moves for these and neither should you.
Unknowable, and worth remembering anyway. Acquisitions, guidance cuts, a fire at a plant. No calendar contains them, no filter catches them, and they are the reason a short call has an open-ended left side for the shares underneath. A takeover can also change your contract's terms outright.
The rule that fits on a line
Before you sell, look up the earnings date. If it falls before expiry, either pick a nearer expiry that lands ahead of it or move on. Then, once inside the last two weeks with the stock through your strike, check the ex-dividend calendar.
That is two lookups per trade, one before and one conditionally after. It removes the single largest source of unpleasant surprises on a covered call, and it is the reason the survivor on this screen paid 8.6 percent instead of 37.
OptionsKing scores every candidate strike on a deterministic 0 to 100 scale, blends that score with the return on the capital the trade ties up, and shows you the highest-ranked handful. There is no minimum score. How it works covers what the ranking does and does not tell you.
Questions people actually ask
Should I avoid selling options over earnings?
As a default, yes. On the worked screen, 12 of the 19 candidates that cleared every other filter had an earnings print inside the expiry window, and on the top-ranked contract half the $61 credit was payment for that single date rather than for time decay.
How much of an option premium is the earnings date?
On the worked contract, $30 of a $61 credit. The same $15 call priced at the 62 percent implied volatility with a print in the window was worth $0.61, and at the 44 percent it carries without one, $0.31.
Does an ex-dividend date inside my window mean I will be assigned early?
Rarely. Early exercise for a dividend only makes sense on an in-the-money call whose remaining time value is smaller than the dividend. On a 0.20 delta covered call sold 45 days out, that combination almost never arrives. One contract in nineteen was dropped on this filter.
Which calendar dates actually matter to an option seller?
Earnings first, by a distance. Then scheduled binary events such as an FDA decision, a court ruling or a lockup expiry. Investor days and index rebalances barely move a chain, and the events that hurt most, such as a takeover bid, appear on no calendar at all.
Sources
Rules and thresholds above were checked against these documents on August 4, 2026. Exchange and broker rules change. Confirm anything you are about to act on with your own broker.
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Do the math on your own trade
Every price in this article is an illustrative worked example, not a quote. Read Screening and probability for the rest of the series, and the disclaimer before you act on any of it. Selling options carries real risk of loss, and the loss can be far larger than the premium you collected.