What Happens When a Bull Put Spread Expires In the Money
By Bruno Nalon · · 5 min read
A bull put spread has defined risk while both legs are open. At expiration, though, each leg settles on its own, and what happens depends on where the stock closes. If both puts finish in the money, they offset and you take the max loss. If only the short put finishes in the money, you can be assigned 100 shares per contract with nothing to offset them. Here is how settlement works, and how to keep a defined-risk trade from turning into a surprise stock position.
The three outcomes at expiration
Take a simple example: you sold the $45 put and bought the $40 put for a $1.50 credit ($150 per contract). Your max profit is $150 and your max loss is $500 minus $150, or $350. At expiration, the result depends on where the stock closes:
| Stock at expiration | Short $45 put | Long $40 put | What you hold after | Net P/L |
|---|---|---|---|---|
| $48 (above both strikes) | Expires worthless | Expires worthless | Nothing | +$150 (max profit) |
| $45 (at the short strike) | Pin risk - may or may not be assigned | Expires worthless | Uncertain | +$150 if not assigned |
| $43 (between the strikes) | Assigned - you buy 100 shares at $45 | Expires worthless | 100 shares per contract | -$50 at a $43 share price |
| $38 (below both strikes) | Assigned - you buy 100 shares at $45 | Exercised - you sell 100 shares at $40 | Nothing | -$350 (max loss) |
The middle rows are the ones that surprise beginners. Between the strikes, the spread does not settle into a simple cash result - it leaves you owning stock, and the value of that stock keeps moving after the market closes.
When both legs finish in the money
If the stock closes below the long strike, both puts are in the money. Your short put is assigned, so you buy 100 shares at the short strike. Your long put is exercised, so you sell 100 shares at the long strike. The two stock trades cancel out and you end up with no shares.
The result is your max loss: the strike width minus the credit. In the example, you buy at $45 and sell at $40, losing $500, offset by the $150 credit - a net loss of $350, plus any exercise and assignment fees.
Long options that finish at least $0.01 in the money are normally exercised automatically under the clearing house's exercise-by-exception rule, so the offset usually happens without any action from you. Your broker's own settings apply on top of that rule, which is why it is worth checking them before your first expiration.
When only the short put finishes in the money
If the stock closes between the strikes, the short put is in the money but the long put is not. You are assigned on the short put and buy 100 shares per contract at the short strike, while the long put expires worthless. There is nothing left to offset the shares.
In a cash account, you need the full strike amount: a $45 short put means $4,500 per contract. In a margin account, your broker may lend part of it, but your buying power drops sharply and a margin call is possible if the stock keeps falling.
The bigger risk is time. Assignment is processed after the close, so you usually find out that evening or the next morning. Over a weekend, the stock can gap lower with no long put left to protect you. That is how a defined-risk spread becomes an undefined-risk stock position.
Pin risk: when the stock closes near the short strike
If the stock closes right around your short strike, you cannot know whether you will be assigned. Option holders can still decide to exercise after the close, and assignments are distributed randomly among short positions, so even a put that looks barely out of the money at 4:00 pm ET can end up assigned if the stock moves in after-hours trading.
The fix is simple: if the stock is near your short strike on expiration day, close the spread before the market closes instead of waiting to see what happens.
Should you close before expiration or let it expire?
The decision comes down to where the stock is relative to your short strike and how much it costs to close:
| Situation on expiration day | Typical move |
|---|---|
| Stock well above the short strike, spread worth $0.10 or less | Let it expire - both puts finish worthless |
| Stock within about 2% of the short strike | Close - avoid pin risk |
| Stock between the strikes | Close - avoid being assigned shares |
| Stock below the long strike | Close - lock in the defined loss and skip exercise fees and settlement surprises |
For example, if your $100/$95 spread is worth $0.15 with the stock at $103 and two days left, paying $15 to close removes almost all remaining risk. Compare the cost of closing with the risk you still carry, not with the credit you originally collected.
Many traders avoid the question entirely by closing spreads well before expiration day. On EasyTrade's Diamond plan, spreads still open at 5 days to expiration are closed automatically for linked tastytrade accounts.
Broker settings, deadlines and contrary instructions
Most US equity options stop trading at 4:00 pm ET on expiration day. After that, exercise notices are processed and assignments are made, and the resulting stock trades settle on the next business day.
Brokers let you submit contrary instructions - for example, not to exercise a long option that is slightly in the money - but the deadlines are usually shortly after the close and vary by broker. Some brokers also close at-risk positions themselves near the end of expiration day if your account cannot support an assignment.
Do not rely on any of this as your plan. Check your broker's exercise and assignment policy the week before your first expiration, and treat closing the position as the default.
Ratio put spreads: extra assignment risk
A standard bull put spread sells one put and buys one put, so the long leg covers the short leg. A ratio put spread sells two or more puts for every put bought. The long put only covers one of them; every extra short put is uncovered and can be assigned on its own.
With a 1x2 ratio, the extra short put needs the same cash as a cash secured put: the strike times 100. On a $200 strike, that is $20,000 per extra contract. If that amount is larger than your account, close the extra shorts well before expiration. For $1k-$25k accounts, standard 1:1 spreads - where the max loss is known before you enter - are the safer choice.
An expiration-day checklist
One, check where the stock is relative to both strikes early in the afternoon, not in the last minutes. Two, if the stock is near or below the short strike, close the spread - liquidity thins and spreads widen into the close, so set a cutoff such as 90 minutes before 4:00 pm ET. Three, if you plan to let anything expire, confirm your broker's exercise settings and deadlines. Four, the next morning, check your account: no shares, no naked short put and no unexpected margin use.
Put a recurring reminder in your calendar for every expiration date you hold. The best way to handle settlement surprises is to never get to settlement with a position that can surprise you.
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