Credit Spread Options: Bull Put & Bear Call Guide
A credit spread is a defined-risk options strategy where you sell one option and buy a further out-of-the-money option to collect a net credit. You profit from time decay as long as the stock stays on the right side of your short strike. It's the workhorse strategy for premium sellers who want a high probability of profit with a strictly capped downside.
What is a credit spread?
A credit spread is two options of the same type and expiration on the same underlying, working as a single vertical spread. You sell one option closer to the money and buy one further out of the money:
- Sell an option to collect premium — this is your short strike, where your profit zone begins.
- Buy a further OTM option to define your risk — this is your long strike, the leg that caps your maximum loss.
Because the option you sell is worth more than the one you buy, you open the whole structure for a net credit, and that credit is the most you can make. The long leg means your capital at risk is just the width of the spread minus the credit — no matter how far the stock moves against you. Combine a put credit spread and a call credit spread and you have an iron condor.
Bull put spread vs bear call spread
There are two flavors of credit spread, and which one you use depends on your directional lean:
- Bull put spread (put credit spread): sell a put, buy a lower put. You are mildly bullish or neutral — the trade wins as long as the stock stays above your short put strike. Built below the current price.
- Bear call spread (call credit spread): sell a call, buy a higher call. You are mildly bearish or neutral — the trade wins as long as the stock stays below your short call strike. Built above the current price.
Both are defined-risk and both collect a credit up front. The only difference is direction: a bull put spread profits from a floor holding, while a bear call spread profits from a ceiling holding.
Credit spread example
Suppose SPY is trading at $500 and you are mildly bullish over the next 30 days. You open a bull put spread:
- Sell the $480 put / buy the $475 put (put credit spread, $5 wide).
- Net credit collected: $1.00 ($100 per spread).
- Max profit: the full $100 credit, kept if SPY closes at or above $480 at expiration.
- Max loss: ($5 − $1.00) × 100 = $400, if SPY closes at or below $475.
- Breakeven: $479.00 — the short strike minus the credit ($480 − $1.00).
You risk $400 to make $100 with roughly a 75–80% probability of the stock staying above your short strike — the classic credit spread risk/reward. The edge comes from time decay and from implied volatility falling after entry. A bear call spread works the same way, mirrored above the price.
Strike and delta selection
The short strike controls your win rate and credit; the long strike controls your max loss:
- Short strike: most traders sell around 0.15–0.30 delta (≈70–85% probability OTM). Lower delta = higher win rate, smaller credit; higher delta = bigger credit, more frequent losers.
- Spread width: wider spreads ($10 vs $5) collect more credit but risk more capital. Narrow spreads cap risk tightly and are easier to defend.
- Days to expiration: 30–45 DTE is the sweet spot for balancing theta decay against gamma risk.
- IV rank: sell into elevated implied volatility (a high IV rank) so you collect richer premium and benefit from IV mean-reversion.
Managing and adjusting the trade
- Take profit early: close at ~50% of max profit instead of holding to expiration to cut gamma risk.
- Set a stop: many traders exit at roughly 1.5–2× the credit received.
- Roll the tested side: if the short strike is breached, roll the spread out in time (and sometimes further OTM) for an additional credit.
- Avoid expiration week: pin risk and assignment risk spike in the final days on a tested spread.
Want to see how credit spreads would have performed across different market regimes? Test the premium-selling thesis on 30+ years of real SPY and SPX data with the options backtester.
Credit spread vs debit spread
The two vertical spreads are mirror images — one sells premium, the other buys it:
- Credit spread: net seller, collects premium up front. Max profit = the credit. Wins from time decay and a stock that stays put or moves in your favor. Benefits from high implied volatility.
- Debit spread: net buyer, pays premium up front. Max profit = spread width − debit. Needs a directional move to profit. Less hurt by IV crush.
Use a credit spread for income and high-probability neutral-to-directional trades, especially when implied volatility is elevated. Use a debit spread when you want a lower-probability, higher-reward directional bet with a defined cost.
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Credit Spread FAQ
What is a credit spread?
A credit spread is a two-leg, defined-risk options strategy where you sell one option and buy a further out-of-the-money option of the same type and expiration. You collect a net credit because the option you sell is worth more than the one you buy. The two main types are the bull put spread (sell a put, buy a lower put) and the bear call spread (sell a call, buy a higher call). Your maximum profit is the credit you collect, and your risk is capped by the long option.
How does a credit spread make money?
You are selling time and volatility. The trade opens for a net credit, and as long as the short strike stays out of the money, both options decay and you keep the credit. Profit comes from theta (time decay) and, often, from implied volatility falling after entry. A bull put spread profits when the stock stays above your short put; a bear call spread profits when the stock stays below your short call. You do not need the stock to move in your favor — you just need it to avoid moving through your short strike.
What is the max profit and max loss on a credit spread?
Max profit = the net credit received, realized if the short strike expires out of the money. Max loss = (width of the spread − net credit) × 100. Example: a $5-wide put credit spread opened for a $1.00 credit has a max profit of $100 and a max loss of ($5 − $1.00) × 100 = $400. Because the long leg caps your exposure, you can never lose more than the spread width minus the credit, no matter how far the stock moves against you.
What delta should I use for a credit spread?
A common approach is to sell the short strike around 0.15–0.30 delta, which corresponds to roughly a 70–85% probability of expiring out of the money. Lower delta (0.15) means a higher win rate but a smaller credit; higher delta (0.30) means a larger credit but more frequent losers. Then buy the long strike one or two strikes further out to define the risk. Match the delta to your directional conviction and the credit you need relative to the spread width.
Credit spread vs debit spread — what is the difference?
A credit spread collects premium up front (you are a net seller) and profits from time decay and a stock that stays put or moves in your favor — max profit is the credit. A debit spread pays premium up front (you are a net buyer) and needs the stock to move in your direction to profit — max profit is the spread width minus the debit. Credit spreads win from theta and high implied volatility; debit spreads win from a directional move and are less hurt by IV crush. Choose a credit spread for income and high-probability neutral-to-directional trades, and a debit spread when you want a defined-cost directional bet.
When should I close a credit spread?
A widely used rule is to close at about 50% of max profit rather than holding to expiration — it locks in gains and sharply cuts gamma and assignment risk in the final week. Many traders also set a stop at roughly 1.5–2× the credit received, or roll the tested side out in time (and sometimes further out of the money) for an additional credit when the short strike is breached. Avoid carrying a tested credit spread into expiration week because of pin and assignment risk.
What are the best stocks and ETFs for credit spreads?
Liquid underlyings with tight bid/ask spreads and deep options chains are ideal — SPY, SPX, QQQ, and IWM are classic choices because they are diversified and reduce single-stock gap risk. Elevated implied volatility (a high IV rank) improves the credit you collect. Liquid large-cap single names can work when you have a directional lean, but avoid illiquid tickers with wide spreads and avoid selling spreads through earnings unless you specifically want the IV-crush play.
Can you trade credit spreads in an IRA?
Yes. Because a credit spread is fully defined-risk, it is one of the more IRA-friendly options strategies and typically requires only Level 3 (defined-risk spreads) approval. The margin requirement equals the max loss (spread width minus credit), which most IRA custodians allow without needing naked-option permissions.
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