(a) The Department or a public housing agency shall calculate payment standards and housing assistance payments under the State Program in accordance with guidelines for the federal Housing Choice Voucher Program.
(b) A family assisted under the State Program shall be expected to pay not more than 30% of its monthly adjusted gross income for rent and utilities, as determined by the public housing agency at the time the family initially receives assistance under the State Program, except as otherwise provided in the federal Housing Choice Voucher Program.