What a Credit Spread Is
A credit spread is an options position that consists of two options on the same underlying stock or ETF, with the same expiration date, but at different strike prices.
One option is sold. This is the primary income-generating leg of the trade, and it works exactly as the single-leg strategies in the preceding articles work: the seller collects premium and benefits if the option expires worthless.
The second option is bought at a strike price further out of the money than the one sold. This purchased option costs less than the one sold, so the net result is a credit: the trader receives more for the sold option than they pay for the bought option. That net credit is the maximum possible gain on the trade.
A credit spread is an options position built from two options on the same underlying, with the same expiration, but at different strike prices. One option is sold to collect premium. The other is bought at a further strike to cap the maximum possible loss. The net result is a credit received upfront, a defined maximum gain equal to that credit, and a defined maximum loss equal to the width of the spread minus the credit received. Both figures are known before the trade is placed.
The bought option serves a specific and critical function: it caps the maximum possible loss. Without it, a sudden adverse move in the stock could produce losses far larger than the premium initially collected. With it, the loss cannot exceed the difference between the two strike prices minus the credit received, regardless of how far the stock moves.
This is the defining feature of a spread: both the best possible outcome and the worst possible outcome are fixed and fully known before entering the trade.
Two Types: Bull Put Spread and Bear Call Spread
Credit spreads come in two directional varieties, each suited to a different market outlook.
The bull put spread is a bullish or neutral strategy. The trader sells a put at a higher strike and buys a put at a lower strike. Premium is collected because the sold put is more expensive than the bought put. The position profits if the stock stays above the higher strike at expiration. It loses if the stock falls below both strikes. Articles 31 covers the bull put spread in full.
The bear call spread is a bearish or neutral strategy. The trader sells a call at a lower strike and buys a call at a higher strike. Premium is collected because the sold call is more expensive than the bought call. The position profits if the stock stays below the lower strike at expiration. It loses if the stock rises above both strikes. Article 32 covers the bear call spread in full.
The bull put spread profits when the stock stays above the sold put strike. It is suited to a neutral to bullish outlook. The bear call spread profits when the stock stays below the sold call strike. It is suited to a neutral to bearish outlook. Both are credit spreads: both collect premium upfront, both have defined maximum gain and defined maximum loss, and both benefit from time decay. The direction of the trade and the strikes chosen determine which type is appropriate.
Both are credit spreads: both receive premium upfront, both have defined maximum gain and defined maximum loss, and both benefit from time passing without a large adverse move.
The Risk-Reward Structure
The credit spread's risk-reward profile follows directly from its construction. Understanding the three key figures before every spread trade is non-negotiable.
Maximum gain equals the net credit received. If a bull put spread is entered for a credit of $0.65, the most the position can earn is $0.65 per share, or $65 per contract. This occurs if both options expire worthless, which happens when the stock stays above the higher put strike at expiration.
Maximum loss equals the width of the spread minus the net credit received. A spread with strikes $5 apart and a credit of $0.65 has a maximum loss of $4.35 per share, or $435 per contract. This occurs if the stock moves fully through both strikes by expiration.
Breakeven price equals the short strike minus the credit received for a bull put spread, or the short strike plus the credit received for a bear call spread. Above the breakeven for a bull put spread, the position is profitable. Below it, losses begin accumulating up to the maximum loss.
This structure reveals a key characteristic of credit spreads that differs from single-leg strategies: the maximum gain is smaller than the maximum loss. A spread that receives $0.65 in credit with a $5 wide spread has a risk-reward of approximately $0.65 to $4.35. Most trades will not reach maximum loss because management rules exit the position before then, but the asymmetry must be understood and accepted at entry.
Why Spreads Instead of Single-Leg Positions
The natural question is why use a spread rather than simply selling the put or call outright, which would collect more premium.
The answer is capital efficiency and risk control. A cash-secured put requires the full collateral to purchase shares at the strike. A bull put spread on the same underlying requires only the maximum potential loss as collateral, which is the spread width minus the credit received. On a $5-wide spread with a $0.65 credit, the collateral requirement is $4.35 per share, or $435 per contract, compared to potentially thousands of dollars for the full cash-secured put.
Credit spreads require significantly less capital than their single-leg equivalents while maintaining a defined risk profile. The trade-off is reduced income: the bought option's premium reduces the net credit received. Understanding the three key figures for any spread, the maximum gain, maximum loss, and breakeven price, and comparing the capital required to the income generated, is the core of spread evaluation before any trade is placed.
Risk control matters equally. The single-leg sold option has theoretically unbounded risk on adverse moves before the management rules trigger. The spread has a hard ceiling on losses regardless of what the stock does. For investors with smaller accounts or investors who want to participate in options income strategies with a more tightly controlled risk profile, credit spreads make the strategy accessible in a way that single-leg positions do not.
The trade-off is income. Spreads always generate less premium than the equivalent single-leg position because the bought option costs money that reduces the net credit. Whether that reduced income is acceptable in exchange for the defined risk and lower capital requirement is a decision each investor makes based on their situation.
Frequently Asked Questions
How wide should a credit spread be? The width of the spread determines the maximum loss and, in most cases, the premium available. Narrower spreads, such as $2 or $3 wide, require less capital and have lower maximum loss, but they also generate less premium and provide less room between the short strike and the breakeven. Wider spreads, such as $5 or $10 wide, generate more premium and provide a wider buffer, but require more capital and produce a larger absolute maximum loss. Most income-focused spread sellers use $5-wide spreads on individual stocks and ETFs as a practical balance, but the right width depends on the underlying's price, the available strikes, and the seller's capital and risk preferences.
How do you manage a credit spread that moves against you? The two primary management approaches are closing the spread for a loss and rolling it. Closing the spread involves buying back the sold option and selling back the bought option simultaneously, locking in a loss smaller than the maximum. Most experienced spread sellers close a losing spread when it reaches two to three times the original credit received, meaning if they collected $0.65 they close if the spread reaches $1.30 to $1.95. Rolling involves closing the current spread and opening a new one at different strikes or a later expiration, typically for a net credit if conditions allow. The specific roll mechanics are covered in Article 49.
What is the probability of profit on a credit spread? The probability of profit on a credit spread is approximately equal to the delta of the short strike at entry. A bull put spread with a short put at 0.25 delta has approximately a 75 percent probability of expiring fully worthless at entry. This probability decreases if the stock moves toward the short strike and increases as time passes without an adverse move. The probability of achieving the maximum gain is slightly higher than the probability of profit, because the breakeven price provides a small buffer between the short strike and the profit zone. Selecting short strikes in the 0.20 to 0.35 delta range keeps the probability of profit in the 65 to 80 percent range for most spread positions.
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