Code of Federal Regulations Title 24. Housing and Urban Development § 24.583.315 Resident rent

(1) 30 percent of the family's monthly adjusted income (adjustment factors include the number of people in the family, age of family members, medical expenses and child care expenses). The calculation of the family's monthly adjusted income must include the expense deductions provided in 24 CFR 5.611(a), and for persons with disabilities, the calculation of the family's monthly adjusted income also must include the disallowance of earned income as provided in 24 CFR 5.617, if applicable;

(2) 10 percent of the family's monthly gross income;  or

(3) If the family is receiving payments for welfare assistance from a public agency and a part of the payments, adjusted in accordance with the family's actual housing costs, is specifically designated by the agency to meet the family's housing costs, the portion of the payment that is designated for housing costs.