What Is a Bull Put Spread?
A bull put spread (credit put spread) is a neutral-to-bullish strategy that generates income by selling a higher-strike put and buying a lower-strike put. The bull put spread is a vertical spread strategy that uses options at two different strike prices with the same expiration date. It is one of the most commonly traded spread strategies because it offers defined risk, defined reward, and straightforward management rules.
Traders use the bull put spread when they have a directional bias and want to define their risk upfront. Unlike buying a single option, the spread caps both the potential gain and potential loss, creating a predictable risk/reward profile. This makes it easier to size positions and manage overall portfolio risk.
The bull put spread has a known maximum loss from the moment you enter the trade. This makes it suitable for traders who want to take directional positions without the unlimited risk of naked options or the high capital requirements of stock positions.
Bull Put Spread Formulas
- 1Enter your specific strike prices and premiums in the calculator above
- 2Net debit or credit is calculated automatically from the premiums
- 3Maximum profit = spread width minus net cost (debit) or net credit received
- 4Maximum loss = net debit paid (debit spreads) or spread width minus credit (credit spreads)
- 5Breakeven = long strike adjusted by net premium
- 6Position P&L changes linearly between breakeven and max profit/loss points
Risk/Reward Analysis
| Market Move | Outcome | P&L Impact |
|---|---|---|
| Stock moves in your favor strongly | Max profit achieved | Capped at max profit |
| Stock moves in your favor moderately | Partial profit | Between zero and max profit |
| Stock stays flat | Depends on spread type | Debit: loss; Credit: profit |
| Stock moves against you moderately | Partial loss | Between zero and max loss |
| Stock moves against you strongly | Max loss | Capped at max loss |
How to Trade Bull Put Spreads
- Vertical spreads are the building blocks of more complex strategies (iron condors, butterflies)
- Credit spreads benefit from time decay; debit spreads are hurt by it
- Spreads reduce Vega exposure compared to naked options
- Position size based on max loss, not premium
- Liquidity matters: use liquid underlyings with tight bid-ask spreads
For credit spreads, many traders sell the short option at 30 Delta (70% probability of profit) and buy the long option $5 further OTM. For debit spreads, buy the ATM option (50 Delta) and sell the option at your target price.
If the stock closes between the two strikes at expiration, you may face partial assignment on the short leg while the long leg is in or out of the money. Close spreads before expiration if the stock is near either strike to avoid pin risk complications.