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The applicable fraction is the percentage of rental units in a building that qualify as low-income units. Specifically, under Internal Revenue Code (IRC) §42(c)(1)(B), the applicable fraction is the smaller of the unit fraction or the floor space fraction. IRC §42(c)(1)(C) defines “unit fraction” as a fraction whose numerator is the number of low-income units in the building, and whose denominator is the number of residential rental units in such building.
