24 C.F.R. § 236.760
Appropriate adjustments will be made in rental assistance payments to reflect changes in income or other circumstances which are reported by a tenant and verified or are shown by the annual tenant income recertification, as required by § 236.80 . Rental assistance payments will be discontinued when it is determined by the Secretary that the amount the tenant is required to pay for rent, in accordance with § 236.735 , is sufficient to pay the approved basic monthly rental (plus, where applicable, the established utility allowance) for the unit occupied by the tenant. Where a tenant is no longer entitled to rental assistance payments, he/she may continue to occupy the unit. The rents charged for the unit shall not exceed those specified in subpart A.
24 C.F.R. §236.760