I am posting one of the pages from this free webinar. It is now available without credit, but watch for others that will give CPE https://www.cpaacademy.org/archived_show/a0D4400000UpQSEEA3 

This is a wonder real short version of how the QBI is done. 

A friend just did a return for one of those wonderful house flippers that formed a CA LLC. Gross sales price 1.4 mill created an LLC "fee" of $6,800. I don't think the attorney warned them of this aspect.