Please elaborate. I tried reading it all and got a headache.
If your married filing jointly and earn under $315,000 (or Single under $157,000) - you can deduct 20% of your net pass through income. Pass through income would include non wage income from an S Corp, income from a Partnership that is not Guaranteed payments or income from a sole proprietorship (plain old Schedule C).
If your married filing jointly and earn over $415,000 (or Single over $207,500) you cannot take the 20% deduction.
If you make somewhere in between, than depending on what kind of business you have is how you determine what percentage of the 20% deduction you are allowed to take.
If someone has a different understanding please feel free to jump in.