Credit Spread
A credit spread is an options strategy where the trader sells a higher-premium option and buys a lower-premium option simultaneously, collecting a net premium upfront in exchange for capped profit and defined maximum loss.
In options trading, a credit spread earns its name because the trader receives more premium on the option they sell than they pay for the option they buy, resulting in a net credit to the account at entry. The two most common credit spread structures are the bull put spread (selling a put at a higher strike, buying a put at a lower strike) and the bear call spread (selling a call at a lower strike, buying a call at a higher strike). Both are defined-risk positions.
The appeal of credit spreads is their probability profile. Because they are typically entered out-of-the-money, the underlying stock does not need to move in any particular direction — it simply needs to avoid closing through the short strike at expiration. For example, selling a $90/$85 put credit spread on a stock trading at $100 means the full premium is retained as long as the stock stays above $90 at expiration. The $5 wide spread generates a credit while limiting the worst-case loss to the spread width minus that credit.
Cash flow management is a key reason traders favor credit spreads over buying options outright. Rather than spending premium and hoping for a large move, credit spread traders are on the winning side of time decay — they profit as theta erodes the value of the sold option faster than the bought option. At expiration, if both options are out-of-the-money, they expire worthless and the credit is fully retained.
Margin treatment on credit spreads at U.S. broker-dealers is regulated by FINRA Rule 4210 and exchange margin rules. Generally, the broker holds back an amount equal to the maximum potential loss (spread width minus credit) as collateral, ensuring the trader can cover the obligation if the spread moves against them. This makes credit spreads accessible to traders in standard (non-portfolio margin) accounts.
Volatility plays an important role in credit spread pricing. When implied volatility is elevated — as it often is before earnings or macroeconomic events — the credit collected on a given spread is larger. However, elevated IV also reflects a higher probability of large moves. Understanding the relationship between IV, option pricing, and probability of profit is central to successfully deploying credit spreads over time.