HUD HCV Guidebook § 5.1

The payment standard in place on the effective date of the HAP contract remains in place for the duration of
the contract term unless the PHA increases or decreases its payment standards.
If a payment standard is increased, the PHA must use the increased payment standard amount to calculate
the monthly housing assistance payment for the family beginning no later than the earliest of:78
     •   The effective date of an increase in the gross rent that would result in an increase in the family share;
     •   The family's first regular or interim reexamination; or
     •   One year following the effective date of the increase in the payment standard amount.79
The PHA may apply a payment standard increase at any earlier date, so long as that policy is included in the
PHA Administrative Plan, and the policy is applied consistently to all families.80