Two moments trip up almost every new options trader: expiration (when the contract ends) and assignment (when you are forced to honor it). They sound scary, but the mechanics are simple once you see them clearly, and understanding them is what keeps a covered call or cash-secured put from turning into a surprise.
In, at, and out of the money
Where the stock sits relative to your strike price decides everything at expiration:
- In the money (ITM): a call is ITM when the stock is above the strike; a put is ITM when the stock is below the strike. ITM options have real value and are usually exercised.
- Out of the money (OTM): the option has no exercise value and expires worthless.
- At the money (ATM): the stock is right around the strike.
What happens at expiration
If your option is OTM at expiration, it simply expires worthless, and if you sold it you keep the full premium. If it is ITM, it is automatically exercised and shares change hands at the strike. Most brokers auto-exercise options that are even a penny ITM at the close, so never assume a barely-ITM option will just disappear.
Exercise vs assignment
These are two sides of the same coin. The option buyer exercises their right; the option seller is assigned the obligation. If you sold the option, assignment means you must deliver: sell your shares at the strike (assigned on a call) or buy shares at the strike (assigned on a put).
Assignment on a covered call
If you sold a covered call and the stock closes above your strike, your 100 shares are sold at the strike price. That is not a disaster, it is the deal you signed up for: you keep the premium plus any gain up to the strike. The only cost is missing further upside above it. See the full setup in our covered calls guide.
Assignment on a cash-secured put
If you sold a cash-secured put and the stock closes below your strike, you buy 100 shares at the strike using the cash you set aside. You keep the premium, which lowers your effective cost basis. Many traders use this on purpose to buy stocks they wanted anyway at a discount, the heart of the cash-secured put strategy.
Early assignment and how to manage it
American-style options can be assigned before expiration, though it is uncommon unless the option is deep ITM or a dividend is due (call sellers are most at risk the day before a stock goes ex-dividend). To avoid unwanted assignment you can roll the option, buy back the one you sold and sell a later-dated one, or simply close the position for a small cost before it goes deep ITM.
The bottom line
Expiration is just the finish line, and assignment is only the obligation you already agreed to. If you sell covered calls and cash-secured puts, assignment is a feature, not a bug: it is how you sell high or buy low while getting paid to wait.
This article is for educational purposes only and is not financial advice. Options involve risk and are not suitable for every investor.
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