To cover the cost of the program, HUD provides funds to allow PHAs to make housing assistance payments on behalf of the families. HUD also pays the PHA a fee for the costs of administering the program. When additional funds become available to assist new families, HUD invites PHAs to submit applications for funds for additional housing vouchers. Applications are then reviewed and funds awarded to the selected PHAs on a competitive basis. HUD monitors PHA administration of the program to ensure program rules are properly followed.