(1)This section applies if in a tax year—
(a)the residence used to provide the foster care from which an individual's foster-care receipts for the tax year are derived is also used by another individual to provide foster care, and
(b)the other individual also has foster-care receipts for the tax year.
(2)Each individual's share of the fixed amount for the tax year is the fixed amount divided by the total number of individuals who—
(a)use the residence in the tax year to provide foster care, and
(b)have foster-care receipts for the tax year.
(3)In this section “residence” means—
(a)a building, or part of a building, occupied or intended to be occupied as a separate residence, or
(b)a caravan or houseboat.
(4)If a building, or part of a building, designed for permanent use as a single residence is temporarily divided into two or more separate residences, it is still treated as a single residence.