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How often do covered calls get assigned?
Roughly as often as the delta suggests. A 0.30-delta call is called away about 3 times in 10, a 0.15-delta call less often. That's the market's rough guess on the day you sell, and the market is often wrong.
The short answer
About as often as the Delta says. Delta is a number between 0 and 1 on the Options chain, and for a seller it works as a rough chance the option finishes in the money. Sell a 0.30-delta call and you can expect to be called away something like 3 times in 10. Sell a 0.15 and it's closer to 1 or 2 in 10.
That's the market's estimate on the day you sell, built from Implied volatility. It isn't a promise. In a strong rally, calls that "should" expire get blown through one after another.
New to delta? Delta for option sellers has the full picture.
Why delta is a decent guess
A call's delta tells you how much its price moves for a $1 move in the stock. A 0.30-delta call moves about 30 cents. It also happens to be close to the chance, as the market prices it, that the stock ends above the strike at expiry.
That's a coincidence of the math, not a law, but it's close enough for sizing. If you sell 0.30-delta calls on ten different months, expect around three to be called away. Expect zero some years and six in others.
What changes the odds after you sell
| Thing that moves | Effect on being called away |
|---|---|
| Stock rises toward the strike | Delta rises; chance goes up |
| Stock falls | Delta drops; chance goes down |
| Time passes with the stock below the strike | Delta shrinks; chance goes down |
| Implied volatility jumps | Delta of out-of-the-money calls rises |
| Ex-dividend date arrives | In-the-money calls can be exercised early |
That last row is the one beginners miss. If your call is in the money and the stock goes ex-dividend before expiry, the buyer may exercise early to grab the dividend. See early assignment before a dividend.
A worked example (an illustration, not a trade idea)
You own 100 shares of a made-up stock, XYZ, bought at $50. You sell a 30-day $55 call with a 0.30 delta for $1.00, collecting $100.
The delta says "about 3 in 10 that XYZ ends above $55." Here's what each path looks like:
| XYZ at expiry | Called away? | Shares | Premium | Total |
|---|---|---|---|---|
| $62 | Yes, at $55 | +$500 | +$100 | +$600 (capped; a plain holder has +$1,200) |
| $56 | Yes, at $55 | +$500 | +$100 | +$600 |
| $54 | No | +$400 | +$100 | +$500 |
| $50 | No | $0 | +$100 | +$100 |
| $41 | No | −$900 | +$100 | −$800 |
Say XYZ falls to $41. The call expires, you weren't assigned, and you lost $800. Not being called away is the common case, and it includes every losing month. "Rarely assigned" isn't the same as "rarely loses."
Being called away is the trade working as designed. The loss comes from the shares, on the months the call expires.
Why "how often" is the wrong worry
New sellers tend to fear assignment. But a covered call that's called away made its full, capped gain. The thing to fear is the other 7 in 10: the months the call expires and the shares are lower.
So pick the strike by what you'd be glad to sell at, not by the lowest delta you can find. If you'd be upset selling XYZ at $55, don't sell the $55 call. That one rule covers most of it.
How to tell when it's happened: how do I know if I got assigned? And for the mirror image, how often do cash-secured puts get assigned?
Inside the wheel strategy, being called away is just the signal to sell the next put. It's a step, not a failure.
Questions
Does a 0.30 delta mean a 30% chance of assignment?
Roughly, as the market prices it on the day you sell. It's an estimate, not a measured fact, and it changes every day as the stock and volatility move.
Can a covered call be assigned before expiry?
Yes. US stock options can be exercised any time. It's most common when the call is in the money and the stock is about to pay a dividend. Otherwise early exercise is rare.
If I don't want to be assigned, can I avoid it?
You can buy the call back before expiry, or roll it to a higher strike and later date. If the stock has run up, both cost more than you collected. See how to avoid assignment.
Is being called away bad?
No. It's the capped-gain outcome you agreed to. The regret is only about the gain above the strike you didn't get.
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