Option Assignment: What Happens When a Short
Understand option assignment for short puts and covered calls, including exercise, expiration, early assignment, stock delivery and portfolio consequences.
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OPTIONS EDUCATION GUIDE
Option Delta and Strike Selection for Sellers
Delta is a sensitivity measure first. Traders often use it as a convenient strike-selection tool, but it should not be treated as a guaranteed probability.
Prepared by Farland Capital Education Team · Educational methodology
What delta measures
- Delta estimates how much an option's theoretical value changes for a small move in the underlying, all else equal.
- For a short put, the position's directional exposure changes as the underlying and time change.
Why sellers use delta
- Delta provides a standardized way to compare strikes across different prices and expirations.
- Lower absolute put delta generally means a farther out-of-the-money strike and less premium, all else equal.
Why delta is not enough
- Volatility skew can make similar deltas carry different premiums and tail exposures.
- Event risk can overwhelm a statistically attractive strike.
- Portfolio concentration matters more than any single contract's delta.
Match strike to objective
- A trader willing to own shares may choose a different strike than someone focused primarily on avoiding assignment.
- Income target, assignment preference, underlying quality, DTE and portfolio risk should all influence the decision.
Continue learning
Rolling an Option vs. Accepting Assignment
Learn the tradeoffs between rolling a short option and accepting assignment, including additional time, credit, realized losses, stock exposure and hidden risk escalation.
Option Position Sizing: Why Contract Count Is
Learn how to size option positions using assignment value, buying power, concentration, stress loss and portfolio liquidity rather than contract count alone.
Educational purposes only. This page is not individualized investment advice or a recommendation to use any security or strategy. Options involve risk and are not suitable for all investors.