What Is Options Assignment?
Assignment happens when an option seller is required to fulfill the contract. Call sellers must sell shares; put sellers must buy shares. Learn when assignment happens and how to handle it.
Definition
Options assignment occurs when an option buyer exercises their contract, and the option seller (writer) is selected to fulfill the obligation. For call sellers: you're required to sell 100 shares at the strike price. For put sellers: you're required to buy 100 shares at the strike price.
Most U.S. equity options are 'American style' — they can be exercised any time before expiration. However, early assignment (before expiration) is relatively rare because buyers typically get more value by selling the option rather than exercising. Early assignment risk increases for deep ITM options, especially before ex-dividend dates.
At expiration, in-the-money options are typically auto-exercised by the broker. Sellers who are assigned learn of it after market close and their shares are transferred the next morning. You can avoid assignment by closing (buying back) your short option position before expiration.
Real-World Example
You sold a $100 put on XYZ for $3 while XYZ traded at $105. XYZ drops to $90, and the put buyer exercises early. You're assigned — forced to buy 100 shares at $100. But your net cost is $97 ($100 - $3 premium). XYZ is at $90, so you're sitting on a $700 paper loss. This is why you only sell puts on stocks you want to own.
Why It Matters
Understanding assignment is critical for any option seller — it's not a theoretical risk. Having a plan for what to do if assigned (keep the shares, sell covered calls, cut losses) is part of responsible options trading.
Get Glen’s Updates
Investing insights, new tools, and whatever I’m building this week. Free. No spam.
Unsubscribe anytime. I respect your inbox more than Congress respects property rights.
Frequently Asked Questions
Can I be assigned before expiration?
Yes — American-style options (most U.S. equity options) can be exercised early. Early assignment is most likely when the option is deep in the money and near an ex-dividend date (for calls, buyers may exercise to capture the dividend). It's relatively rare otherwise.
What happens to my account when I'm assigned?
If assigned on a call, your 100 shares are removed and you receive cash at the strike price. If assigned on a put, cash equal to the strike × 100 is removed and 100 shares are added to your account. Assignment is handled automatically — you'll see the changes the morning after expiration.
How do I avoid unwanted assignment?
Close (buy back) your short option position before expiration, especially if it's in the money. Many traders set a rule to close when they've captured 50-80% of the original premium, avoiding the tail risk of assignment near expiration.
Related Terms
Recommended Resources
Tools & books I actually use and recommend
SeekingAlpha Premium
Quant ratings, earnings transcripts, and the stock analysis community where I published 300+ articles.
Try SeekingAlphaA Random Walk Down Wall Street
Burton Malkiel's classic case for index investing. The book that convinced millions to stop stock-picking.
View on AmazonThe Little Book of Common Sense Investing
John Bogle's manifesto on why low-cost index funds beat everything else. Straight from the founder of Vanguard.
View on AmazonSome links above are affiliate links. I only recommend products I personally use. See my full disclosures.
Keep Exploring
Covered Calls Explained
Managing assignment when selling covered calls.
Read moreStrategyCash-Secured Puts Explained
What assignment means for put sellers.
Read moreGlossaryExpiration Date
When assignment is most likely to occur.
Read moreHubFinancial Glossary
Browse all 149 financial terms.
Read more