On February 28, the Federal Housing Finance Authority (FHFA) issued a final rule that requires government-sponsored enterprises Fannie Mae and Freddie Mac (GSEs) to harmonize programs, policies, and practices affecting the cash flows of To-Be-Announced (TBA)-eligible mortgage-backed securities (MBS). The final rule—which codifies requirements that take effect May 6—takes into account commenter feedback by, among other things, making explicit the consequences of misalignment and directing the GSEs to lower the maximum mortgage note rate eligible for MBS inclusion. The final rule applies to both the GSEs’ current offerings of TBA MBS, as well as to the new uniform MBS, which the GSEs will start issuing June 3 (previously covered by InfoBytes here).