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Thanks again and your reply is the proof that I need to study a lot more before I even think about putting real money at risk.

You are 100% correct, I have no proof.

In ToS the fill price is de middle middel between Bid/Ask, I think. I'm testing with very liquid high volume options/stocks like AAPL and there is not a wide spread. Do you know the difference with Interactie Brokers? Is their fill more to the Bid or Ask side of the price range?

The "risk" I use is the probability that is calculated for options. When the probability for an option strike price is 80% of expiring out of the money, I assume the probability (risk) of expiring in the money is 20%.

Thanks. The probability calculations for options are widely used. Do you advise to not use them when deciding that strike price to trade?

Thanks for your reaction. I made the calculation for the AAPL put credit spread with strikes 134/133 (27.5), 135/134 (30,0), 136/135 (32,0), 137/136 (35,1), 138/137 (38,5) and for the at the money 146/145 (51,0), and the closer I get to the current stock price, the higher number I get from your...

I’m new to trading and only paper trade and learn on Thinkorswim. I’m interested in put credit spreads (out of the money) and these trades is what I am testing and learning. The following numbers are for the put credit spread of AAPL September 3 2021, with the stock trading at about $ 145...