HUD published a notice in the Federal Register to announce the inflation factors that will be used to adjust FY 2013 renewal funding for the Tenant-Based Rental Assistance voucher program or Housing Choice Voucher (HCV) program. The Renewal Funding Annual Adjustment Factors (AAFs), based on Consumer Price Index (CPI) data for rents and utilities, were replaced FY 2012 to include inflation factors that incorporate additional economic indices to measure the expected change in the per unit cost (PUC) for the HCV program. The inflation factors have been developed to account for relative differences in the PUC of vouchers so that HCV funds can be allocated among PHAs. HUD will continue to update the current model with available data in order to assess the expected annual change in PUC and intends to update the methodology for future funding estimates. These changes are effectively immediately.