### Comment:
So I guess my question is when playing spreads do you profit from credit or collateral? I am assuming credit, right? Do to make more profit I'd have to have higher credit and collateral? How do I calculate how much profit I can make from this play: 
 [https://i.imgur.com/iChUONp.jpg](https://i.imgur.com/iChUONp.jpg)

### REPLY:
Your max profit is the credit, $740, your max loss is the collateral, $7k.  When that trade is executed your account will gain $740 (you won't see it though it will immediately be applied to the collateral).  If QQQ trades below $188 on 09/20 you'll take a loss.  If QQQ trades below $184.50 on 09/20 you will incur the max loss -$7k.  If QQQ trades above $188 at expiration you will keep the whole credit, +$740.

### END.