On May 2, FHA published Mortgagee Letter (ML) 2023-09 to implement provisions of the Adjustable Rate Mortgages (ARM): Transitioning from LIBOR to Alternative Indices final rule that was published in the Federal Register at the beginning of March. (Covered by InfoBytes here.) The final rule replaces LIBOR with the Secured Overnight Financing Rate (SOFR) as the approved index for newly-originated forward ARMs, codifies HUD’s approval of SOFR as an index for newly-originated home equity conversion mortgages (HECM) ARMs, and establishes “a spread-adjusted SOFR index as the Secretary-approved replacement index to transition existing forward and HECM ARMs off LIBOR.” The ML provides interest rate transition directions for mortgagees and announces the availability of updated HECM model loan documents, which have been revised to be consistent with the final rule and the ML. The provisions in the ML have various effective dates.