Core Concepts
Understanding Assignment
Learn what option assignment means, what happens when a short option is assigned, and how assignment affects cash-secured puts and covered calls.
What Is Assignment?
Assignment occurs when the seller of an option is required to fulfill the obligation created by the option contract.
When you sell an option, you receive premium, but you also accept an obligation. If you are assigned, that obligation becomes a transaction involving the underlying shares.
Simple definition
Assignment means an option seller must fulfill the terms of the contract after the option is exercised.
Exercise vs. Assignment
Exercise and assignment describe opposite sides of the same option contract.
Exercise
The option holder uses the right provided by the option contract.
Assignment
An option seller is selected to fulfill the corresponding obligation.
Buyers have rights under the contract. Sellers accept obligations in exchange for receiving premium.
Assignment on a Cash-Secured Put
When you sell a cash-secured put, you accept the obligation to purchase shares at the strike price if you are assigned.
One standard equity option contract normally represents 100 shares. Therefore, assignment on one short put normally results in the purchase of 100 shares at the strike price.
Cash-Secured Put Example
Put Strike
$45
Contracts
1
Purchase Obligation
$4,500
If assigned, you would normally purchase 100 shares for $45 each, requiring $4,500 before considering the premium you previously received.
Premium Changes Your Effective Cost
The premium received from selling the put can reduce the effective cost of the shares in a simplified calculation.
Put Strike
$45.00
Premium Received
$0.50
Effective Cost
$44.50
$45.00 − $0.50 = $44.50 per share
This is a simplified premium-adjusted calculation and does not account for fees, taxes, or other transactions.
Assignment on a Covered Call
A covered call creates the opposite share obligation. When you sell a covered call, you agree to sell your shares at the strike price if assignment occurs.
Covered Call Example
Shares Owned
100
Call Strike
$55
Sale Proceeds
$5,500
If assigned on the covered call, you would normally sell your 100 shares at $55 each, producing $5,500 in sale proceeds before fees and taxes.
What If the Stock Is Above the Call Strike?
Suppose you sold the $55 covered call and the stock later rises to $60.
Market Price
$60
Call Strike
$55
Assigned Sale Price
$55
If assigned, you sell the shares at the $55 strike even though they are trading at $60 in the market. This illustrates the upside trade-off created by selling a covered call.
When Can Assignment Happen?
For standard American-style equity options, assignment can occur before expiration. It is not limited only to the final day of the contract.
Early assignment is possible.
A short option position should therefore be treated as carrying an assignment obligation while it remains open. Traders should not assume they can always wait until expiration before assignment becomes possible.
In-the-Money Options at Expiration
Options that finish in the money at expiration are generally at high risk of exercise and assignment. Brokerage and clearing procedures can affect how expiring positions are handled.
Do not rely on assumptions about expiration.
If you do not want the resulting share transaction, consider the position before expiration and understand your broker's procedures and deadlines.
Assignment Is Not Automatically a Bad Outcome
Assignment is sometimes discussed as though it means a trade failed. That is not necessarily the case.
If you sell a cash-secured put on an underlying you are willing to own at the strike price, purchasing the shares may be an outcome you already planned for.
Likewise, if you sell a covered call at a price where you are willing to sell your shares, having those shares called away can be an expected outcome of the strategy.
The key is preparation.
Before selling an option, understand what assignment would require and decide whether that outcome fits your plan.
Assignment Does Not Remove Market Risk
Being comfortable with assignment does not mean assignment is risk-free.
Cash-Secured Put Example
Suppose you are assigned shares at a $45 strike after the stock falls sharply. If the stock is now trading at $35, you still purchase the shares at $45 under the option contract.
The premium collected can reduce the effective cost basis, but it may offset only a small portion of a large decline in the underlying.
What Can an Option Seller Do Before Expiration?
A short option does not always have to be held through expiration. Depending on the position and the trader's plan, there may be several choices while the contract remains open.
Hold
Continue holding the position while accepting its ongoing risk and assignment exposure.
Buy to Close
Purchase the short option back to close the position and remove the option obligation.
Roll
Close the existing option and open another contract with a different expiration, strike, or both.
Rolling does not erase a loss or eliminate risk. It closes one position and opens another position with a new set of risks and obligations.
Assignment and Buying Power
Assignment can create a substantial share transaction because each standard equity option contract normally represents 100 shares.
$20 Put Strike
$2,000
$50 Put Strike
$5,000
$100 Put Strike
$10,000
These examples show the cash needed to purchase 100 shares at each strike before considering premium. This is why position sizing matters when selling cash-secured puts.
Assignment and the OptionEdge Approach
The OptionEdge approach treats assignment as a possible outcome that should be considered before a cash-secured put is opened, not something to think about only after the underlying moves toward the strike.
Delta Focus
0.15 or Lower
Delta is one factor used when evaluating a potential cash-secured put setup.
DTE Focus
4–14 DTE
Shorter-duration trades are still evaluated with the understanding that assignment can occur.
The question to ask before selling the put
“Am I financially and strategically prepared to own 100 shares at this strike?”
OptionEdge strategy guidelines do not guarantee that assignment will be avoided or that a position will be profitable.
Common Assignment Mistakes
Selling a cash-secured put without being prepared to purchase 100 shares at the strike.
Selling a covered call without being willing to sell the shares at the strike.
Assuming assignment can only happen on expiration day.
Assuming an out-of-the-money option can never move into the money before expiration.
Treating assignment as automatically profitable because premium was collected.
Ignoring position size and the amount of capital required if multiple contracts are assigned.
Holding an expiring position without understanding the broker's expiration and assignment procedures.
Key Takeaways
Assignment requires an option seller to fulfill the obligation of the contract.
A short put can result in purchasing shares at the strike price.
A short covered call can result in selling shares at the strike price.
One standard equity option contract normally represents 100 shares.
American-style equity options can be assigned before expiration.
Assignment can be an expected part of a strategy, but it still carries market and capital risk.
Before selling an option, understand exactly what assignment would require.