### Question
How is the term floor space fraction defined?


### Answer
The term **floor space fraction** is defined in *26 U.S.C. § 42* as the following:

> the fraction—



(i) the numerator of which is the total floor space of the low-income units in such building, and



(ii) the denominator of which is the total floor space of the residential rental units (whether or not occupied) in such building

#### Citation:
  - *26 U.S.C. § 42*
  - Heading: **Subtitle A-Income Taxes > CHAPTER 1-NORMAL TAXES AND SURTAXES > Subchapter A-Determination of Tax Liability > PART IV-CREDITS AGAINST TAX > Subpart D-Business Related Credits**

