How Assignment Works on Credit Spreads
When you sell a credit spread, only your short leg can be assigned. The long leg is yours — you choose whether to exercise it.
Bull put spread assignment: You sold the $185 put and bought the $180 put. If assigned on the $185 put, you're obligated to buy 100 shares at $185. But you still own the $180 put, which you can exercise to sell those shares at $180.
Bear call spread assignment: You sold the $275 call and bought the $285 call. If assigned, you must sell 100 shares at $275 (going short). You can exercise your $285 call to buy shares and close the position, but this results in a $10/share loss capped by the spread width.
When Assignment Actually Happens
Assignment is far less common than beginners fear. It typically only occurs in specific situations:
Deep in the money near expiration. If your short put has $5+ of intrinsic value and there's less than a week to expiration, the option holder has little reason to keep it — they might exercise.
Ex-dividend dates. Call holders sometimes exercise early to capture a dividend. If a stock pays a $1.50 dividend and your short call has $0.80 of time value, the call holder might exercise to get the dividend (since $1.50 > $0.80 time value they'd forfeit).
No time value remaining. When an option is deep in the money with zero extrinsic value, there's no penalty for the holder to exercise early.
Not common: Assignment when your short option is out of the money, or when significant time value remains.
What Happens If You Get Assigned
Step 1: Your broker assigns you. For a short put, you now own 100 shares. For a short call, you're short 100 shares.
Step 2: You still hold the long leg of your spread. This protects you.
Step 3: You exercise the long option or sell the shares and close the long option separately.
The net result is the same max loss you calculated when you entered the trade. Assignment doesn't create additional risk on a credit spread — it just settles the trade through shares rather than cash.
The catch: You need enough buying power to temporarily hold the shares. If your account can't support a $18,500 stock purchase (100 shares × $185), you might get a margin call before you can close out the next morning.
How to Avoid Assignment Entirely
Close before expiration. If your spread is in the money with 3-5 days to expiration, close it. Pay the small debit and move on. Most assignment happens in the final week.
Watch for dividends. If you have a short call spread on a stock going ex-dividend, monitor the time value of your short call. If time value drops below the dividend amount, consider closing.
Avoid deep in-the-money situations. If the stock has blown through your short strike by $5+, close the spread. It's already a loss — don't add assignment complications.
Trade European-style options. SPX options are European-style (cash-settled, no early assignment possible). SPY options are American-style (can be assigned). If assignment risk concerns you, SPX spreads eliminate it entirely.
The SPX Solution
Many experienced spread traders use SPX (S&P 500 index) options instead of SPY specifically to avoid assignment risk. SPX options:
The trade-off is slightly wider bid-ask spreads and higher per-contract value.
Assignment Horror Stories Are Overblown
Here's the reality: in years of selling credit spreads, most traders experience assignment a handful of times. And when it happens, it's inconvenient but not catastrophic. Your long option still protects you.
The real risk isn't assignment — it's not managing your spreads properly. A spread that blows through both strikes and you hold to expiration will lose the maximum amount whether assignment happens or not.
Focus on managing your positions with clear rules and tracking them in OptionsPilot, and assignment becomes a minor operational detail rather than something to lose sleep over.