by QB loss do you mean QBI loss/199A loss. An activity can generate an ordinary loss that gets deducted on your 1040 to the extent allowed by law. has nothing to do with 199A/QB. If the activity is a qualified business with a loss the 199A/QB amount, usually the same as the ordinary loss gets carried forward for next years QB/199A computation. so with a qualified business activity there are two elements the 1040 ordinary income/loss element and the the 199A income/loss element, An ordinary loss would normally be allowed each year if not from a passive activity but if it is then it is subject to the PAL rules for deductibility. however a QB loss can not go negative but becomes a carryforward. see form 8995.
