I'm not even sure how to calculate this at this point.  Say I have an S Corp that pays me $100K in wages, passes thru $4K of income on the K-1 and a $10K S179 deduction.  What's my QBI?

(a) $4K
(b) $0
(c) $6K QBI loss carryover
(d) None of the above

Keep in mind, the $10K is allowed to create a "loss" on the business because the owner's wages are factored into the calculation.  Or we can simplify it some and go with this one:  S Corp pays me $100K in wages, has $0 income on the K-1 and $10K S179 deduction.  Is QBI $0 or -$10K?  The law of unintended consequences...

Another question I've seen on other forums, what about SEHI from an S Corp?  SEHI is already effectively deducted from the S Corp income by virtue of the fact that it's included in the W-2 wages of the owner.  But QBI regs seem to suggest we might need to deduct it again as "effectively connected" to the K-1 income, which may be $0.

Are we having fun yet?