if you have QB Income then you can get a QBI deduction of up to 20%. if you have a business loss, you get a negative QB deduction of up to 20% but that can only be used to offset the QBI deduction generated by other activities. to the extent not used it becomes a carry forward.
look at form 8995
20Z goes nowhere as you are going through entering the K-1 data there will be further questions about QBI
example extremely simplified
activity 1 business income $10,000 QBI deduction $2,000
activity 2 business loss $5000 QBI deduction offset -$1000
net QBI deduction $1,000
I suppose you can skip it completely but you cannot report QBI only for businesses with income and ignore businesses with a loss. I doubt if you can skip the QBI reporting if there are net business losses because those unused QBI losses must be carried over to offset any future QBI income.
