Debit vs Credit Spreads
Understand when to pay for a spread versus when to collect premium
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Debit vs Credit Spreads
You now know four vertical spreads. Two are debit spreads (you pay) and two are credit spreads (you get paid). A common question is: which one should I use? The answer depends on IV, your conviction, and the trade-offs you are willing to accept.
Quick Recap
Debit Spreads — Bull call spread, Bear put spread
- You pay to enter
- You need the stock to move in your direction
- Max loss = debit paid
- Time decay works against you
Credit Spreads — Bull put spread, Bear call spread
- You collect premium to enter
- You need the stock to stay away from your strikes
- Max loss = width minus credit
- Time decay works for you
The Same Trade, Two Ways
Here is something that trips people up. A bull call spread and a bull put spread can express the exact same bullish view. The difference is how you structure it.
AAPL at $190. You are bullish.
Bull call spread (debit):
- Buy $190 call for $7.00, sell $200 call for $3.00
- Debit: $4.00 | Max profit: $6.00 | Breakeven: $194
Bull put spread (credit):
- Sell $190 put for $6.50, buy $180 put for $3.00
- Credit: $3.50 | Max profit: $3.50 | Max loss: $6.50 | Breakeven: $186.50
Both are bullish. But the debit spread needs AAPL above $194 to profit. The credit spread profits as long as AAPL stays above $186.50. The credit spread has a wider profit zone but a worse risk-to-reward ratio ($6.50 risk for $3.50 reward vs $4.00 risk for $6.00 reward).
When to Use Debit Spreads
Strong directional conviction. If you believe AAPL is going to $200, the debit spread pays more when you are right. You are buying a directional bet.
Low implied volatility. When IV is low, options are cheap. You are buying cheap options and selling even cheaper options. The debit is small relative to the potential payout.
You want better risk-reward. Debit spreads typically offer 1:1 to 1:2 risk-to-reward. You risk less to make more — but the probability of reaching max profit is lower.
Defined catalyst. If you expect a specific event to move the stock (earnings, FDA decision, product launch), a debit spread gives you more upside from that move.
When to Use Credit Spreads
Moderate or no directional conviction. You think AAPL probably does not go below $180, but you are not sure it goes to $200. Sell a put spread and collect premium from "probably not."
High implied volatility. This is the big one. When IV is elevated, option premiums are inflated. Selling that inflated premium through credit spreads means you collect a bigger credit. If IV drops after you enter, the spread shrinks in value and you profit.
You want probability on your side. Credit spreads placed out-of-the-money can have 65% to 75% win rates. You win more often but make less per win.
Income generation. If your goal is to generate consistent income rather than hit big winners, credit spreads are the vehicle. Sell them monthly, manage at 50% profit, repeat.
The IV Decision Framework
This is the practical rule most traders use:
| IV Environment | Bullish Trade | Bearish Trade |
|---|---|---|
| Low IV (under 30th percentile) | Bull call spread (debit) | Bear put spread (debit) |
| High IV (above 50th percentile) | Bull put spread (credit) | Bear call spread (credit) |
When IV is low, buy options (debit spreads). They are cheap and have room to expand. When IV is high, sell options (credit spreads). They are expensive and likely to contract.
This single rule will improve your trade selection immediately.
Risk-Reward vs. Probability
There is no free lunch. Every advantage comes with a tradeoff.
Debit spread example: Risk $400, max profit $600. Probability of profit: 40%. Expected value: (0.40 x $600) - (0.60 x $400) = $240 - $240 = $0
Credit spread example: Risk $700, max profit $300. Probability of profit: 70%. Expected value: (0.70 x $300) - (0.30 x $700) = $210 - $210 = $0
Both have similar expected values at fair pricing. The market is efficient. You gain an edge through strike selection, timing, and management — not from the structure itself.
Practical Takeaways
- Check IV rank before choosing. High IV? Sell premium. Low IV? Buy premium.
- Match the spread to your conviction level. Strong conviction needs debit spreads. Mild conviction works with credit spreads.
- Debit spreads need movement. Credit spreads need the absence of movement. Know which one matches your outlook.
- Manage both the same way. Take profits at 50% of max, cut losses before max loss. The numbers change but the discipline does not.
Now that you understand all four verticals and when to use each one, it is time to combine them. Next up: the iron condor.