Understanding Early Assignment of Covered Calls
Early assignment occurs when the holder of your call option exercises their right to buy your shares before the option's expiration date. For American-style options (which include all equity options in the US), the buyer can exercise at any time. Early assignment is relatively uncommon but happens most frequently the day before an ex-dividend date, when the call is deep in-the-money and has very little extrinsic (time) value remaining.
The key factor in early assignment risk is the relationship between the remaining extrinsic value and the upcoming dividend. A call holder will rationally exercise early only when the dividend they would receive by owning the stock exceeds the extrinsic value they forfeit by exercising. If the extrinsic value is $0.50 and the dividend is $0.75, early exercise is rational because the call holder gains $0.25 by exercising and capturing the dividend rather than holding the option.
If the dividend amount exceeds the remaining extrinsic (time) value of the call option, early assignment is likely the day before the ex-dividend date. Monitor your ITM covered calls carefully when dividends approach.
How to Assess Early Assignment Probability
- 1Intrinsic value = $108 - $100 = $8.00
- 2Extrinsic value = $8.50 - $8.00 = $0.50
- 3Dividend ($0.75) > Extrinsic value ($0.50)
- 4Early assignment is LIKELY before ex-dividend date
- 5If assigned: profit = ($100 - $98 + $4.00) × 100 = $600
- 6You lose the $0.75 dividend but keep the $4.00 premium
Early Assignment Risk Factors
| Factor | Higher Risk | Lower Risk |
|---|---|---|
| Dividend vs. Extrinsic | Dividend > extrinsic value | Dividend < extrinsic value |
| Moneyness | Deep in-the-money | At-the-money or OTM |
| Time to Expiration | Near expiration (low extrinsic) | Far from expiration (high extrinsic) |
| Interest Rates | Low rates (less carry cost) | High rates (opportunity cost of exercise) |
| Implied Volatility | Low IV (less extrinsic) | High IV (more extrinsic) |
What to Do About Early Assignment Risk
Managing Early Assignment
Early Assignment Is Not Always Bad
Many covered call writers react to early assignment with alarm, but it often results in a favorable outcome. When assigned early, you realize your profit sooner and can redeploy the capital immediately. You also avoid the risk of the stock declining between now and expiration. The main loss is the dividend you would have received, but the premium you collected often exceeds the dividend amount. Calculate your total return before panicking about early assignment.
Early assignment frees up your capital sooner. If you would have been assigned at expiration anyway, early assignment simply accelerates your profit realization. You can immediately sell a new cash-secured put or redeploy the capital.