Most people think options trading means buying calls before a stock rockets higher. And sure, that works sometimes. But the traders who grind out consistent returns month after month? They’re usually on the other side of that trade. They’re selling premium.
The problem with selling options naked is that the risk can be enormous. Unlimited, in some cases. That’s where credit spreads come in. Same idea as selling premium, but with a safety net.
What Is a Credit Spread?
A credit spread involves two options at the same expiration but different strike prices. You sell one option (collecting premium) and buy another further out of the money (capping your risk). The net premium you receive is your max profit. The width of the spread minus the premium is your max loss.
You get paid upfront. That’s the “credit” part. And you profit when the options expire worthless or decrease in value.
There are two types, depending on your directional bias.
Bull Put Spreads: Bullish or Neutral
A bull put spread is for when you think a stock will stay above a certain price. You’re selling a put and buying a lower-strike put as protection.
Example: Stock XYZ is at $100. You think it’s going to hold above $90 over the next 30 days.
- Sell the $92 put for $2.50
- Buy the $90 put for $1.50
- Net credit: $1.00 per share ($100 per contract)
Max profit: $100 (the credit received). This happens if XYZ stays above $92 at expiration. Both puts expire worthless, you keep the premium.
Max loss: Width of spread minus credit = ($92 - $90) - $1.00 = $1.00 per share ($100 per contract). This happens if XYZ drops below $90 at expiration.
Break-even: $92 - $1.00 = $91.00
Notice the math here. You’re risking $100 to make $100. That’s a 1:1 risk/reward. Not amazing. But the probability is tilted in your favor because you only need the stock to stay above $92. It can go up, stay flat, or even drop to $92.01 and you still win.
You profit in three out of four scenarios: stock goes up, stock stays flat, stock goes down a little. You only lose if it drops hard. That’s a different game than buying calls, where you only win in one scenario.
Bear Call Spreads: Bearish or Neutral
A bear call spread is the mirror image. You think a stock will stay below a certain price.
Example: Stock XYZ is at $100. You think it won’t get above $110 in the next 30 days.
- Sell the $108 call for $2.00
- Buy the $110 call for $1.20
- Net credit: $0.80 per share ($80 per contract)
Max profit: $80 if XYZ stays below $108 at expiration.
Max loss: ($110 - $108) - $0.80 = $1.20 per share ($120 per contract) if XYZ goes above $110.
Break-even: $108 + $0.80 = $108.80
Same logic, different direction. You’re betting the stock won’t rip higher, and you collect premium for that bet.
Probability of Profit
This is where credit spreads get interesting. Every option has a delta, which roughly correlates to the market’s estimated probability of that option expiring in the money.
If you sell a put with a delta of 0.25, the market is saying there’s roughly a 25% chance that put expires in the money. Which means there’s a 75% chance it doesn’t. Your probability of profit (POP) on that spread is approximately 75%.
Higher POP = less premium collected. Lower POP = more premium but more risk. The market isn’t giving away free money. If you want an 85% POP trade, the premium will be small relative to the risk. If you want fat premium, you’ll need to accept a 55-60% POP.
Most consistent credit spread traders target the 70-80% POP range. That’s the sweet spot where you’re winning 7 or 8 out of 10 trades, and the premium is still worth the risk.
How to Pick Your Strikes
Here’s a practical framework for strike selection.
Step 1: Identify support or resistance. For bull put spreads, find a price level the stock has bounced off multiple times. That’s your short strike neighborhood. For bear call spreads, find a ceiling the stock hasn’t been able to break through.
Step 2: Check the delta. Sell the strike with a delta between 0.15 and 0.30. That gives you a POP in the 70-85% range. Below 0.15 and the premium is too thin. Above 0.30 and you’re taking on more directional risk than a credit spread warrants.
Step 3: Set your width. The distance between your two strikes determines your max loss. Wider spreads collect more premium but risk more. Start with $2-$5 wide spreads while you’re learning. You can always widen them later.
Step 4: Check the premium relative to width. A good rule of thumb: aim for premium that’s at least 20-30% of the spread width. On a $5-wide spread, that means collecting at least $1.00-$1.50. If you’re only getting $0.40 on a $5-wide spread, the risk/reward doesn’t justify the trade.
When Credit Spreads Work Best
Credit spreads thrive in specific conditions.
High implied volatility. When IV is elevated, premiums are fat. You collect more credit for the same probability of profit. Selling spreads in low-IV environments gets you pennies for your risk.
Range-bound stocks. If a stock has been trading between $90 and $110 for three months, selling a put spread below $90 or a call spread above $110 makes sense. You’re betting the range holds.
After IV spikes. Post-earnings IV crush is a classic setup. Sell a credit spread the day after earnings when IV is still elevated but the event risk is gone.
When you have a directional lean but don’t need a big move. This is the key difference from buying options. You don’t need the stock to move in your favor. You just need it to not move against you.
Managing Losers
Not every spread works. When a stock blows through your short strike, you need a plan.
The 2x rule: If the spread doubles in value (you collected $1.00 and it’s now worth $2.00), close it. The trade thesis has broken. Take the $100 loss instead of riding it to the max loss of potentially $400.
Roll if the thesis is intact. If the stock moved against you but you still believe in the level, you can roll the spread out to a later expiration. This gives you more time and often lets you collect additional credit. But don’t roll a broken thesis. If the stock just made a new all-time high, your bear call spread at the old resistance level is dead. Accept it.
Close winners early. If you’ve captured 50-70% of the max profit with weeks still left until expiration, take it. Holding for the last 30% of profit exposes you to gamma risk as expiration approaches. The math says early profit-taking on credit spreads improves long-term returns.
The Edge
Credit spreads won’t make you rich overnight. A $100 profit on a $5-wide spread isn’t going to be anyone’s retirement story. But do that 8-10 times a month with a 75% win rate and proper risk management, and you’re compounding real capital.
The edge is probability and patience. The market overprices options most of the time. Selling that overpriced premium, with defined risk, over hundreds of trades… that’s how this strategy pays off.