Anything to "clearly" explain the QBI deduction? HA HA HA! "It seems rather complex." Understatement of the century. "Simplifying" it? You jest! Clear and simple are not adjectives that will ever explain the QBI, and complex doesn't do it justice. I took a 4-hour course on it, learned more in an update seminar, and read a lot. The one clear takeaway I can offer is that almost no one will get to deduct 20% of their net profit. There is a limitation that applies to everyone: You can deduct the LOWER of 20% of your net profit or 20% of your TAXABLE income (ignoring here the other limits imposed by AGI or type of business). For taxpayers whose business is pretty much their only income, their taxable income is certain to be less than their profit.
For example, you are self-employed as a tax professional and have $100k profit. You adjust that by one-half of SE tax, self-employed health insurance, and maybe contributions to a retirement plan, and then subtract your standard deduction. Your taxable income is now $50k. Your QBI deduction is limited to .2 X $50k = $10k, not the 20% $20k you were dreaming of. The only people I can imagine that will get the full 20% of net profit are those who have W2 jobs and a little side business.