24 C.F.R. § 880.603

assistance for mixed families (families whose members include those with eligible immigration status, and those without eligible immigration status) in lieu of termination of assistance, and for provisions concerning deferral of termination of assistance.
(4) Streamlined income determination. An owner may elect to follow the provisions of 24 CFR 5.657(d).
(Approved by the Office of Management and Budget under control number 2502-0204)