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Are Debit Spreads Better Than Credit Spreads?


Here are some misconceptions about credit spreads:

  • "One of the many drawbacks of a credit spread is that it will tie up so much capital."
  • “Selling credit spreads is like picking up pennies in front of a steam roller.”
  • "Credit spreads are different from debit spreads. One has a low probability of success, the other has a high probability of success."

I hope that after reading this article, some of those misconceptions will be cleared.

 

The trigger for this article was a conversation I had on Twitter with one of my followers. Here is a snapshot:

 

017a2e035fc42b0cc48ad650491c8be5.png

 

Same Probability? You Bet!

 

The link in my tweet pointed to one of my previous articles where I clearly demonstrated that credit spreads are in fact the same as debit spreads if using the same strikes.

 

I guess that one picture is better than thousand words, so lets try to visualize the concept.

 

Lets try to construct a RUT credit spread having ~80% probability of success. Using August 2014 expiration and July 10 closing prices, we can do the following trade:

  • Sell Aug. 2014 RUT 1210 call
  • Buy Aug. 2014 RUT 1220 call

 

The risk profile looks like this:

 

2d01dfcc7ae0f782135c4a55f388f3b3.png

 

As we can see, we get $185 credit for this trade, our margin is $815 ($1,000-185) and maximum gain is 22.7% (185/815). The maximum gain is realized if RUT stays below 1210 by August expiration.

 

As shown in the chart, the breakeven point is 1211.76 and probability of success 79.5%.

 

Now lets try to construct the same trade with puts. The trade will be:

  • Sell Aug. 2014 RUT 1210 put
  • Buy Aug. 2014 RUT 1220 put

 

The risk profile looks like this:

 

1599bf7b0f476bec2f301b293f06389e.png

 

In this trade, we are paying $815 and our margin is the same as the debit ($815). The maximum gain is realized if RUT stays below 1210 by August expiration, in which case the put spread will be worth $1,000. The maximum gain? 1000-815=185, so 185/815=22.7%, exactly the same as with the credit spread. As shown in the chart, the breakeven point is 1211.76 and probability of success 79.5% - again, exactly the same as with the credit spread.

 

There might be some practical reasons to prefer one trade over another. In our example, the credit spread is constructed using OTM (Out Of The Money) options, that tend to be more liquid and have tighter bid/ask. So while "theoretical" prices might be the same, in practice you might get better fills (which means better probability of success) with the credit spread. In addition, OTM options don't have assignment risk, while ITM options do. That means that you always have to close the ITM spreads before expiration, while with OTM spreads, you can just let them expire. Of course assignment risk is relevant only to American style options. European style options like RUT, SPX etc. can be exercised only at expiration and don't have assignment risk.

 

The bottom line:

 

The trade can be constructed by selling lower strike and buying higher strike. When using calls, we will get a credit. When using puts, we will pay a debit. But if the same strikes are used, this is exactly the same trade. Same risk profile, same maximum gain, same probability of success, same breakeven point.

 

Want to learn more about options?

 

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Guest Ricardo Espinosa

Posted

Great explanation...if they were not the same, you could do arbitrage...buy to open a debit spread and sell the same amount of credit spreads, or the other way around. 

I tend to like short spreads because if the trend changed and the market moves against me, I can always buy to close the short leg and keep the winning long leg.

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They are definitely the same, however is there generally better liquidity on the in the money side, i.e. on the ITM Put Credit Spread versus the OTM Call Debit Spread?

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