24 C.F.R. § 982.604

(a) For a person residing in SRO housing, the payment standard is 75 percent of the zero-bedroom payment standard amount on the PHA payment standard schedule. For a person residing in SRO housing in an exception area, the payment standard is 75 percent of the HUD-approved zero-bedroom exception payment standard amount.

(b) The utility allowance for an assisted person residing in SRO housing is 75 percent of the zero bedroom utility allowance.