12.—(1) In calculating the amount of the housing costs element under Part 4 or 5 of this Schedule, a deduction is to be made in respect of each non-dependant who is a member of the renter’s extended benefit unit.
(2) Sub-paragraph (1) is subject to paragraphs 14 and 15.
(3) Any amount to be deducted under sub-paragraph (1) is referred to in this Schedule as a “housing cost contribution”.