A credit spread and a debit spread are both two-leg vertical spreads, but they sit on opposite sides of the trade. A credit spread sells the more expensive option and buys a cheaper one for protection, so you collect cash up front and profit when the option decays. A debit spread buys the more expensive option and sells a cheaper one to lower the cost, so you pay cash up front and profit when the stock moves your way. In short: credit spreads are income and probability plays, debit spreads are directional plays.
The fundamental difference
- Credit spread: you receive a net credit at entry. Time decay works for you, and you win if the stock stays on the right side of your short strike. Maximum profit is the credit.
- Debit spread: you pay a net debit at entry. Time decay works against you, and you need the stock to move toward your long strike. Maximum profit is the strike width minus the debit.
- Both are defined risk: the long leg caps your loss, so neither can blow past the width between strikes.
Credit spread example (bull put spread)
You are mildly bullish on a $100 stock. You sell the $95 put for $2.00 and buy the $90 put for $0.80, collecting a net credit of $1.20 ($120). The width between strikes is $5.00.
| Metric | Formula | This example |
|---|---|---|
| Net credit (max profit) | Short premium − long premium | $2.00 − $0.80 = $1.20, or $120 |
| Strike width | Short strike − long strike | $95 − $90 = $5.00 |
| Max loss | Width − net credit | $5.00 − $1.20 = $3.80, or $380 |
| Breakeven | Short strike − net credit | $95 − $1.20 = $93.80 |
| You profit when | Stock stays above breakeven | Above $93.80 at expiration |
You keep the full $120 if the stock closes above $95 at expiration, and your loss is capped at $380 even if the stock collapses. Model your own strikes on the credit spread calculator.
Debit spread example (bull call spread)
Same $100 stock, same bullish view, but now you want a directional bet. You buy the $100 call for $4.00 and sell the $105 call for $2.00, paying a net debit of $2.00 ($200). The width is again $5.00.
| Metric | Formula | This example |
|---|---|---|
| Net debit (max loss) | Long premium − short premium | $4.00 − $2.00 = $2.00, or $200 |
| Strike width | Short strike − long strike | $105 − $100 = $5.00 |
| Max profit | Width − net debit | $5.00 − $2.00 = $3.00, or $300 |
| Breakeven | Long strike + net debit | $100 + $2.00 = $102.00 |
| You profit when | Stock rises above breakeven | Above $102 at expiration |
Here you risk $200 to make up to $300, but the stock has to climb above $102 to profit. Compare the two structures on the bull call spread calculator and the put spread calculator.
Credit spread vs debit spread: side by side
| Feature | Credit spread | Debit spread |
|---|---|---|
| Cash flow at entry | Receive a credit | Pay a debit |
| Time decay (theta) | Works for you | Works against you |
| Max profit | The net credit | Width minus the debit |
| Max loss | Width minus the credit | The net debit |
| Wins when | Stock stays put or moves slightly your way | Stock moves decisively your way |
| Probability of profit | Usually higher | Usually lower |
| Reward-to-risk | Often less than 1 to 1 | Often more than 1 to 1 |
| Bullish version | Bull put spread | Bull call spread |
| Bearish version | Bear call spread | Bear put spread |
When to use each
- Use a credit spread when implied volatility is high (premiums are rich) and you expect the stock to stay range-bound or drift gently in your favor. You want time and probability on your side.
- Use a debit spread when implied volatility is low (options are cheap) and you have a clear directional view with a catalyst. You accept a lower probability for a better reward-to-risk ratio.
- Think about decay. If you want theta working for you, lean credit. If you are buying a move and want defined cost, lean debit.
- Combine them. Selling both a bull put spread and a bear call spread at once creates an iron condor, a popular neutral income trade.
How to choose your strikes
- Set your directional bias: bullish, bearish, or neutral.
- Decide whether you want income with high probability (credit) or a directional payoff (debit).
- Pick the short strike using delta as a probability guide, for example a 0.30 delta short strike for roughly a 70% chance of expiring out of the money.
- Choose the width between strikes to size your maximum risk and reward.
- Confirm breakeven and max loss on the option breakeven calculator before you place the order.
Frequently asked questions
Is a credit spread or debit spread better for beginners?
Both are defined-risk strategies suitable for learning, but debit spreads are often simpler to grasp because you pay a known cost and profit when the stock moves your way. Credit spreads have a higher probability of profit but require comfort with selling options and managing assignment risk.
Why does a credit spread have a higher probability of profit?
A credit spread profits as long as the stock stays on the right side of your short strike, which can include sideways and even slightly adverse moves. A debit spread needs a decisive move in your direction, so its probability of profit is generally lower in exchange for a better reward-to-risk ratio.
What is the maximum loss on a credit spread?
The maximum loss is the width between the strikes minus the net credit you collected. In the bull put example, a $5 width with a $1.20 credit caps the loss at $3.80 per share, or $380 for one contract.
Do credit spreads benefit from time decay?
Yes. Because you are a net seller of premium, time decay works in your favor and erodes the value of the spread you sold, which is profit to you as long as the stock cooperates. Debit spreads are the opposite, since time decay reduces the value of the options you bought.
