How to Avoid Assignment on Short Options

Assignment is one of the most feared outcomes among newer options sellers, and one of the most preventable. In the vast majority of cases, assignment does not happen without clear warning signs. Understanding when assignment risk is highest and taking straightforward steps before expiration eliminates most unwanted assignment entirely.

When assignment actually happens

Assignment on a short option occurs in two scenarios:

Standard expiration assignment: your short option expires in the money at the 4:00pm close on expiration day. The OCC automatically exercises any option in the money by at least $0.01. As the short seller, you receive the assignment.

Early assignment: the long holder of an American-style option chooses to exercise before expiration. This is less common than expiration assignment but happens in specific situations.

Understanding both scenarios is the foundation of avoiding them.

The three main early assignment triggers

Early assignment before expiration is relatively rare, but three situations make it significantly more likely:

Trigger 1: your short call is deep in the money before an ex-dividend date.

If you hold a short call on a stock that is about to pay a dividend, and that call is deep in the money with very little extrinsic value remaining, the long holder may exercise early to capture the dividend. By owning the shares (via exercising the call), they receive the dividend. By holding the call instead, they receive no dividend.

The risk window: the 2 to 5 trading days before the ex-dividend date, for any short call that is deep ITM with less than the dividend amount remaining in extrinsic value.

How to avoid it: check ex-dividend dates when you sell covered calls or any short call position. If the stock has an ex-dividend date within your expiration window and your call is deep ITM, close or roll the position before the ex-dividend date.

Trigger 2: your short put is deep in the money with near-zero extrinsic value.

When a short put is so far in the money that it has almost no extrinsic value remaining, early exercise becomes rational for the long holder. Exercising gives them the intrinsic value immediately rather than waiting for expiration.

In practice, early exercise on deep ITM puts happens most often when the underlying has dropped dramatically and the put has moved very deep in the money. This is a signal that the trade is in serious trouble and should be managed or closed regardless of assignment risk.

How to avoid it: if your short put has moved deep ITM with minimal extrinsic value remaining, close the position. The assignment risk is secondary to managing the directional loss.

Trigger 3: American-style options near expiration when extrinsic value approaches zero.

As any option approaches expiration and its extrinsic value approaches zero, early exercise becomes more rational for the long holder. At near-zero extrinsic value, holding the option provides almost no additional benefit over exercising.

For most OTM short options with reasonable time remaining, this is not a concern. Extrinsic value only approaches zero for deep ITM options or options very near expiration.

The standard expiration assignment: how to avoid it

Standard assignment at expiration is completely avoidable through one simple rule: close your short options before expiration day if they are at or near the money.

The specific thresholds to watch:

If the stock is within 2% of your short strike with 7 or fewer DTE: this position requires active monitoring. Consider closing unless the stock is trending strongly away from your strike.

If the stock is within 1% of your short strike with 2 or fewer DTE: close this position before expiration Friday to eliminate assignment risk. The remaining extrinsic value is minimal and not worth the assignment uncertainty.

If the stock is within $0.50 of your short strike on expiration Friday: close immediately. You are in pin risk territory. The difference between expiring OTM and ITM can be decided by a single trade in the final minutes.

The cost of closing versus the risk of assignment

A common hesitation about closing near-expiry short options is the small closing cost. An option worth $0.05 costs $5 to close per contract. Many traders try to avoid this cost by holding to expiration.

The math does not favor this decision when assignment risk is present.

If you are assigned on a short call you did not want exercised (for example, a covered call where you did not want to sell your shares), reversing the assignment requires buying shares at the market price plus transaction costs. The cost of reversing unwanted assignment almost always exceeds the $5 to $15 cost of simply closing the short option before expiration.

Close the short option when the closing cost is small relative to the assignment risk. The certainty is worth the small debit.

How spreads reduce assignment risk

When you sell a vertical spread (bull put spread, bear call spread, iron condor) rather than a naked option, the short option and the long option together form a unit. The long option acts as a built-in backstop.

If your short put expires deep ITM and you are assigned on the short put, you also own the long put at a lower strike. You can exercise the long put to offset the shares you were assigned at the short strike, limiting your total loss to the spread width minus the credit received.

This mechanical protection is one of the strongest practical arguments for using defined-risk spread structures rather than naked options, particularly for traders who do not want to monitor positions actively near expiration.

A pre-expiration checklist to avoid assignment

Run through this checklist for every short options position in the week before expiration:

Step 1: Is the stock within 5% of my short strike? If yes, mark it for monitoring.

Step 2: Are there any ex-dividend dates between now and expiration? If yes and the short call is deep ITM, close or roll before the ex-dividend date.

Step 3: Does the short option have 7 or fewer DTE and is the stock within 2% of the strike? If yes, plan to close this week.

Step 4: On expiration Thursday: review all remaining short positions. Close any with the stock within 1% of the strike.

Step 5: On expiration Friday morning: for any position still open with the stock near the strike, close before noon. Do not hold through expiration when the stock is near your strike.

What to do if assignment happens despite your precautions

Occasionally assignment catches traders off guard, most often from after-hours exercise on expiration day. If you wake up Monday morning to find you have been assigned:

Assess the resulting stock position. If you were assigned on a short put, you now own 100 shares at the strike price. If you want to exit the stock position, sell the shares at the open.

If you were assigned on a short call and did not own the shares (naked call), you are short 100 shares. Close the short stock position immediately to avoid further exposure.

Check whether your long option (if you held a spread) can be exercised to offset the assignment. Contact your broker if the exercise was not automatic.

Calculate your total loss including all premiums received and the difference between the strike price and the current stock price. Make sure the loss falls within your defined max loss for the trade.

Related terms: Assignment, exercise, pin risk, OPEX, early assignment, covered call, cash-secured put, expiration date

Try it on Stryke: Monitor all short positions and their proximity to current stock prices as expiration approaches in the Portfolio tracker.