I finally discovered that this QBI deducation is way more complicated than it seems. I tried to make a maximum deduction to my Solo 401-K and guess what? It affects my QBI. Found this article by searching Google "How The New QBI Deduction-Reduction Ruins The Value Of Pre-Tax Retirement Plans For Small Business Owners" - Read it if you like or anyone else who is trying to take both deductions: <a rel="nofollow" target="_blank" href="
https://www.kitces.com/blog/199a-qbi-deduction-reduction-small-business-owner-retirement-plan-contri...>
