Bull Put Spread: Collect Premium on a Bullish View with Defined Risk
A bull put spread sells a put to collect premium and buys a cheaper put below it to cap the maximum loss. You profit if the underlying stays above the upper strike. Unlike a bull call spread, you collect money when you enter — not pay it.
- 1
Sell a put at a higher strike — you collect premium immediately
Choose a put strike below the current market price — typically at the 20–30 delta level. You receive premium for selling this put. If the underlying stays above this strike at expiry, the put expires worthless and you keep the full premium. This is your profit engine.
- 2
Buy a cheaper put at a lower strike — this caps your maximum loss
Buy a put further out-of-the-money. You pay a smaller premium for it. This long put is your insurance: if the underlying falls sharply through the short strike, the long put starts gaining value and limits your loss to the spread width minus the credit received. Without this wing, you would have unlimited downside risk.
- 3
Keep the net credit if the underlying stays above the short strike
If the underlying closes above the higher strike at expiry, both puts expire worthless. You keep the entire credit received when you entered the trade. This is the maximum profit. It requires the underlying to do nothing more dramatic than stay above a level it is already above.
- 4
Your maximum loss is fixed: spread width minus the credit collected
If the underlying falls below the long strike, you lose the full spread width minus the premium you collected upfront. This is the worst case — and it is known precisely before you enter. No surprises, no margin calls beyond the defined maximum.
When to Use a Bull Put Spread
Use a bull put spread when you are neutral to bullish — you expect the underlying to stay flat or rise. The trade profits as long as the underlying stays above the short strike, which means you do not need a strong upward move. You just need the market to avoid a meaningful drop. This makes the bull put spread useful in sideways markets as well as gently rising ones.
Credit vs. Debit: The Key Difference from a Bull Call Spread
A bull call spread pays a debit — you pay money upfront and need the market to rise for profit. A bull put spread receives a credit — money comes in immediately, and you profit simply by the market not falling past your short strike. Both are bullish strategies with defined risk and reward, but they have different profit conditions. The bull put spread can win even in a flat market; the bull call spread needs the market to actually move up.
The Numbers: Max Profit, Max Loss, Break-Even
Probability of Profit
One of the advantages of the bull put spread over a bought option is that it can have a higher probability of profit. If you sell a put spread with the short strike at the 25-delta level, there is roughly a 75% probability the underlying closes above it at expiry. Bought options (long calls and puts) typically have a probability below 50% of expiring in profit. The tradeoff is that when the bull put spread loses, it loses more than the premium collected.
Bull Put Spread vs. Bull Call Spread
| Feature | Bull Call Spread | Bull Put Spread |
|---|---|---|
| Trade type | Debit — pay money upfront | Credit — receive money upfront |
| Profit condition | Underlying rises above breakeven | Underlying stays above the short put strike |
| Max profit | Spread width − debit paid | Net credit received |
| Max loss | Debit paid | Spread width − credit received |
| IV preference | Low IV — cheaper to buy | High IV — richer premium to sell |
| Flat market | Loses the debit if market stays flat | Keeps the credit if market stays flat |
Managing the Trade
Target: Close at 50% of Max Profit
Once you can buy back the spread for half the credit you received, close it. If you collected $4, close when you can buy it back for $2. At this point you have captured half the maximum profit, and the remaining $2 of potential gain is not worth the risk of holding through expiry — where gamma becomes unpredictable.
Roll or Close if the Short Strike Is Tested
If the underlying approaches your short strike, the spread is in danger. You have two choices: close the entire spread for a loss and move on, or roll the spread down and out — buy back the current spread and sell a new one at lower strikes with a later expiry, collecting additional credit. Never let a losing spread sit untouched through expiry.
Use Bull Put Spreads in High IV Environments
This is a credit strategy — you are selling premium. The higher the implied volatility, the richer the premium you collect for the same strikes. Enter bull put spreads when implied volatility is elevated relative to recent history. Avoid entering credit spreads in very low IV environments where the premium collected barely justifies the risk.
Risk Disclosure
Options trading involves risk of loss. While the bull put spread has a defined maximum loss, that loss can exceed the credit received if the underlying falls through both strikes. All examples use simplified numbers for educational purposes only and do not constitute investment advice. Consult a registered financial advisor before trading.
Key Takeaways
- A bull put spread sells a higher-strike put and buys a lower-strike put at the same expiry.
- You receive a net credit upfront — this is the maximum profit you can make.
- Maximum profit is kept if the underlying closes above the higher strike at expiry.
- Maximum loss is the spread width minus the net credit received.
- Breakeven = higher strike − net credit received.
- This is a premium-selling strategy: time decay and a stable or rising market both work in your favour.