Each participating jurisdiction must invest HOME funds made available during a fiscal year so that, with respect to tenant-based rental assistance and rental units:

(a) Not less than 90 percent of:

(1) The families receiving such rental assistance are families whose annual incomes do not exceed 60 percent of the median family income for the area, as determined and made available by HUD with adjustments for smaller and larger families (except that HUD may establish income ceilings higher or lower than 60 percent of the median for the area on the basis of HUD's findings that such variations are necessary because of prevailing levels of construction cost or fair market rent, or unusually high or low family income) at the time of occupancy or at the time funds are invested, whichever is later; or

(2) The dwelling units assisted with such funds are occupied by families having such incomes; and

(b) The remainder of:

(1) The families receiving such rental assistance are households that qualify as low-income families (other than families described in paragraph (a)(1) of this section) at the time of occupancy or at the time funds are invested, whichever is later; or

(2) The dwelling units assisted with such funds are occupied by such households.