Agree with your comment on the american style.
A negative on SPY relative to SPX is as you say there are no .5s (i.e. 135.5, etc.), but I generally trade 10 pointers on the SPX so it's not really a big issue.
Also, what I really care about is the net credit I receive. Sure the commission is 10 times, but the net credit could be the same or better with the SPY than the SPX. Paying more in commissions to ToS, may get me a better rate than what I currently have and may qualify me for added benefits. Of course, this is just a side consideration and not the main reason I would trade SPY instead of SPX.
But if the credit is better on SPY, why not.
A negative on SPY relative to SPX is as you say there are no .5s (i.e. 135.5, etc.), but I generally trade 10 pointers on the SPX so it's not really a big issue.
Also, what I really care about is the net credit I receive. Sure the commission is 10 times, but the net credit could be the same or better with the SPY than the SPX. Paying more in commissions to ToS, may get me a better rate than what I currently have and may qualify me for added benefits. Of course, this is just a side consideration and not the main reason I would trade SPY instead of SPX.
But if the credit is better on SPY, why not.
Quote from rallymode:
SPY being american style should be of no concern to your bear call spread unless you actually plan on letting the market go past your short side, no?
I havent done any SPY credit spreads due to the fact that i can't get a 5-pointer there so i don't know the likeliness of a better fill than a fill on the SPX options but it has been my experience with debit spreads that most of the times i can get a fill at mid point whereas with the SPX i'd have to give up some of that credit even after comms are taken into account.
Unless there is something i am missing due to my inexperience trading SPY credit spreads over SPX credit spreads, i dont see why you wouldnt go for the SPY spread in the above example.