If that's true, then the "substantially similar" rule is meaningless. It is intentionally poorly defined so that the IRS has the ability to apply it arbitrarily and inconsistently whenever they feel like it. That explains why no one can give me a definition of "substantially similar". Still, I think if you sell 100 shares of XOP at a loss and then immediately short a $2 ITM put expiring in 2 months, I don't think that will qualify as a wash sale as the exposure and returns are not the same. Agree with Sig though, avoid doing wash sales if you can. Changing underlings is probably better (sell XOP, buy COP for example).