What is assignment in options trading?
When does a short option get assigned?
Assignment means the holder of an option exercises their right and the counterparty is assigned. On a short option that can turn into a stock position or a delivery obligation. The risk depends on the option type, the expiration, moneyness and events such as dividends. Any management plan has to account for assignment up front, not after the fact.
How an assignment happens
When the holder of an option exercises, their broker files the exercise with the clearing house. The clearing house allocates it to a broker carrying short positions in the same series, and that broker passes it to an account by a published method — random selection or first-in, first-out. Assignment can therefore be neither forced nor avoided.
In practice that means you find out afterwards, usually before the next session opens. Whether to hold, hedge or close the stock position that has appeared is therefore always a decision made after the event, never before it.
When it gets more likely
Early assignment only applies to American-style contracts, and it clusters in a few situations: in-the-money short calls the day before the stock trades ex-dividend, deep in-the-money short puts, and anything finishing in the money at expiration under automatic exercise. The less time value the option holds, the more sense exercising makes for the other side.
On a spread, the leg that gets assigned takes its own cover with it. The long leg opposite still stands and still caps what the risk is worth, but overnight the position is no longer a pure options position, and the capital requirement changes accordingly.
What is in the account afterwards
After assignment you hold a stock position: long from an assigned short put, short from an assigned short call with no cover. Either ties up capital and carries the full overnight stock risk, no matter how defined the original spread was. A management plan has to describe this case in advance, not the morning after.
Strategies where the term matters
- Cash-Secured Put — After a 30% drop, would the strike still be a price you actually want to pay?
- Covered Call — Are you willing to hand over the shares at the call strike - even if they keep running afterwards?
- The Wheel — Would you buy and hold this stock even without the option premium?
Related terms
Every term in one place: the options glossary.
This material is general information about option strategies, written for a general audience. It is not investment advice, not a recommendation, and not financial analysis. Options can lose their entire value, and uncovered positions can lose more than the amount committed. Anything said about tax is general in nature and is no substitute for professional tax advice. Last reviewed: 2026-08-06.