Since we have nothing more so far than a "facts and circumstances" test for trade or business, how would you fix it, if you wanted to support effective tax administration while still carrying out some faint semblance of the intention of Congress when creating the QBI deduction under the TCJA law?
I suppose somewhere there might be comments on IRS proposed regs? AICPA requests? Anything new or fresh?
I would regulate as follows: (basically, a safe harbor, to drastically reduce the number of possible audits).
Case A: If your net gain from a Schedule E rental activity is $25K or less (or, if a loss, your net loss is $25K or less), then by default it will be considered QBI (income/loss).
Case B: If not, then a facts and circumstances test applies, and I might want to implement a due diligence form of some kind (even if just a few Yes/No questions, like the many we already deal with for business entities).
If desired, a taxpayer can make an election to be exempted from Case A, and apply Case B instead. Such election to be made within six months after due date of return excluding extensions. Such election only revocable by consent of commissioner.