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Options Assignment
occurs when the buyer of an option exercises their right to buy (call) or sell (put) the underlying stock, and you as the option seller are obligated to fulfill the contract.
Assignment can happen any time before expiration for American-style options, but is most common at expiration when options are in-the-money.
Quick answer
Assignment = You're forced to buy/sell stock because someone exercised their option. Happens when: 1) Options are ITM at expiration, 2) Early assignment (rare), 3) Dividend capture. Avoid by closing positions before expiration or ex-dividend dates.
The OCC auto-exercises any option that finishes in the money by $0.01 or more, so even a contract that looks worthless at the close can be assigned — the single most common source of surprise assignment.
What is Options Assignment?
Options assignment is one of those topics that strikes fear into new options traders, but it's actually a straightforward concept once you understand the mechanics. Assignment occurs when you, as an option seller (writer), are required to fulfill your obligation because the option buyer has exercised their right.
Here's the simple version: When you sell an option, you're making a promise. If you sell a call, you promise to sell 100 shares at the strike price if requested. If you sell a put, you promise to buy 100 shares at the strike price if requested. Assignment is when the buyer says "I'm requesting it" and you must deliver.
Key Point: Only option sellers can be assigned. If you only buy options, you'll never be assigned—you control when and if to exercise. Assignment is the flip side: someone else is exercising, and you're on the hook to fulfill the obligation.
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When Does Assignment Happen?
Assignment typically occurs in three scenarios:
1. Automatic Assignment at Expiration (Most Common)
If your short option expires in-the-money by even $0.01, it will be automatically exercised by the Options Clearing Corporation (OCC). This is the most common form of assignment and happens every Friday after market close.
Example: You sold a SPY 450 call. At expiration, SPY closes at $450.10. Your option is $0.10 ITM, so it gets automatically exercised. You wake up Monday morning and discover you're now short 100 shares of SPY at $450, and the buyer owns those shares.
2. Early Assignment (Less Common)
American-style options (most equity options) can be exercised any time before expiration. Early assignment typically happens when:
- An option is deep in-the-money with little time value remaining
- A stock is about to pay a dividend (calls get assigned to capture the dividend)
- Interest rate arbitrage opportunities exist (rare)
3. Pin Risk Assignment (Tricky)
When a stock closes very close to your short strike at expiration (within a few cents), you might or might not be assigned. The option holder has until 5:30pm ET Saturday to decide whether to exercise. This creates uncertainty—you won't know if you own stock until Monday morning.
The Mechanics of Assignment
Understanding what actually happens during assignment helps demystify the process:
Call Assignment Process
If you're assigned on a short call:
- Your brokerage removes the short call from your account
- You're now short 100 shares at the strike price
- Your account receives cash equal to Strike Price × 100
- If you don't own the shares (naked call), you're now short stock
Example: Short 1 AAPL 180 call, AAPL is at $185
After assignment: You're short 100 AAPL at $180, and have $18,000 in your account. You're losing $5 per share ($500 total) because AAPL is at $185 but you're short from $180.
Put Assignment Process
If you're assigned on a short put:
- Your brokerage removes the short put from your account
- You're now long 100 shares at the strike price
- Your account is debited Strike Price × 100
- You now own 100 shares whether you wanted them or not
Example: Short 1 TSLA 200 put, TSLA drops to $190
After assignment: You own 100 TSLA at $200, and your account is debited $20,000. You're down $10 per share ($1,000 total) because TSLA is at $190 but you bought at $200.
How to Avoid Unwanted Assignment
Most traders prefer to close positions rather than be assigned. Here's how to avoid assignment:
1. Close Positions Before Expiration
The simplest method: buy back your short options before expiration Friday. Most professional traders close positions with 7-10 days remaining to avoid assignment risk and gamma exposure.
Rule of thumb: If your short option is ITM with less than a week to expiration, close it or roll it. Don't let it expire ITM if you want to avoid assignment.
2. Roll Positions
Rolling means closing your current position and opening a new one at a later expiration or different strike. This extends your trade and avoids assignment.
Example: You're short the 50 put expiring Friday, stock is at $49. Buy back the Friday 50 put, sell the next week's 50 put. You've rolled forward, avoiding assignment.
3. Monitor Ex-Dividend Dates
If you're short calls and the stock goes ex-dividend tomorrow, expect early assignment on ITM calls. Call holders will exercise to capture the dividend. Close these positions 1-2 days before ex-dividend to avoid assignment.
4. Use Spreads Instead of Naked Options
Vertical spreads have defined risk and rarely result in problematic assignments. If you're assigned on your short leg, you can exercise your long leg to offset. This is much safer than naked options.
What to Do If You're Assigned
Don't panic. Assignment is a normal part of options trading. Here's what to do:
If Assigned on a Short Call
You're now short 100 shares. Your options:
- Buy back the shares immediately: Close the short position at market open Monday
- Hold the short position: Only if you're bearish and willing to manage the risk
- If it was a covered call: Your shares are gone, you keep the premium. This is expected and fine.
If Assigned on a Short Put
You now own 100 shares. Your options:
- Sell the shares immediately: If you don't want to own the stock
- Hold the shares: If you're bullish or were wheel trading (intended to own)
- Sell covered calls: If you're keeping the shares, start selling calls to generate income (the Wheel Strategy)
Assignment Costs and Fees
Assignment isn't free. Be aware of these costs:
- Assignment fee: Most brokers charge $5-15 per assignment
- Exercise fee: If you exercise your long leg to offset, another $5-15
- Stock commission: If you need to close the stock position, potential commission
- Margin interest: If assigned over the weekend, you might pay interest on borrowed funds
These costs add up. This is why professional traders close positions instead of letting them expire ITM.
Common Assignment Mistakes
❌ Mistake #1: Letting Spreads Expire ITM
If your short leg is ITM but your long leg is OTM, you'll be assigned on the short leg without the protection of the long leg until Monday. This creates overnight risk. Always close or exercise before expiration.
❌ Mistake #2: Insufficient Account Balance
If assigned on a short put in a cash account, you need the full amount (strike × 100) in cash. If you don't have it, your broker will liquidate other positions or charge you margin interest.
❌ Mistake #3: Ignoring After-Hours Movement
Your option expires OTM at 4pm, so you think you're safe. But the stock drops 2% after hours, and your option expires ITM. You're assigned. Always close positions you don't want assigned, even if they're slightly OTM.
Key Takeaways
- ✅ Assignment happens when the buyer exercises and you must fulfill your obligation to buy or sell shares
- ✅ Most assignments occur at expiration on ITM options (automatic exercise rule)
- ✅ Early assignment is rare but happens before dividends or on deep ITM options
- ✅ Avoid assignment by closing or rolling positions 7-10 days before expiration
- ✅ If assigned, don't panic—close the stock position on Monday if unwanted
- ✅ Assignment fees and costs make it cheaper to close positions than let them expire ITM
- ✅ Use defined-risk spreads instead of naked options to limit assignment risk
- ✅ Monitor ex-dividend dates religiously if you're short calls
Related reading: assignment before expiration is covered in depth in early assignment risk (dividend capture and deep-ITM mechanics), and the expiration-week version in pin risk.
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Questions
What people ask
about this.
How do I know if I've been assigned on a short option?
Assignment appears in your account overnight: a short call assignment removes 100 shares per contract (or creates a short stock position), a short put assignment delivers 100 shares and debits the cash. Brokers notify you before the next open. You cannot be assigned intraday on a position you've already closed — buying back a short option ends assignment risk immediately.
Can I be assigned on an out-of-the-money option?
It's rare but possible. Holders can exercise any option they own, and occasionally do exercise slightly OTM contracts — typically when after-hours price moves on expiration day make the exercise profitable, or for dividend or hedging reasons. This is why closing short options that are near the strike before expiration is standard practice.
When is early assignment most likely?
Two situations dominate: (1) short calls the day before an ex-dividend date, when the dividend exceeds the call's remaining extrinsic value, and (2) deep-ITM short puts with almost no extrinsic value left, where the holder captures interest on the cash. If your short option's extrinsic value is below roughly $0.05, treat assignment as live risk.
What happens when you get assigned on a covered call?
If your covered call is assigned, your 100 shares are sold at the strike price. You keep the premium received plus any gain up to the strike, but you forgo upside above it. Assignment on a covered call is usually benign — it simply means the trade reached its maximum profit and the shares were called away.
Can you avoid assignment by closing the option?
Yes. You can only be assigned on an open short option, so buying it back to close before expiration (or before an ex-dividend date for ITM calls) eliminates assignment risk entirely. Traders often close or roll short options once most of the extrinsic value has decayed to sidestep assignment.
Do you get charged a fee for assignment?
Most major U.S. brokers no longer charge an assignment or exercise fee, though some still do — typically a few dollars per contract. The bigger cost of unwanted assignment is usually the resulting stock position: overnight directional exposure and the capital or margin required to hold the shares.
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