If Mason had an unallowed loss of $500, when would the $500 loss be taken into account when determining the QBI deduction? The year the $500 loss occurred if it is an ullowed loss per the basis limitation. The year the $500 loss is carried forward to and included in determining taxable income. Losses are never considered for the QBI deduction. The year the $500 loss occurred if it is an unallowed loss per the passive loss limitation