On February 23, FHFA issued a notice of proposed rulemaking (NPRM) to amend the Enterprise Regulatory Capital Framework (ERCF) that governs Fannie Mae and Freddie Mac. (See also FHFA fact sheet here.) Changes include modifications to the capital requirements for commingled securities, the introduction of a 0.6 risk multiplier for calculating multifamily mortgage exposures backed by properties with certain government subsidies, the introduction of a standardized approach for calculating counterparty credit risk for derivatives and cleared transactions, and modifications for how representative credit scores for single-family loans are determined. Fannie and Freddie would also be required to “assign an original credit score of 680 to single-family mortgage exposure without a permissible credit score at origination” instead of 600. The NPRM also modifies “guarantee assets, mortgage servicing assets, time-based calls for [credit risk transfer] exposures, interest-only [mortgage-backed securities], the single-family countercyclical adjustment, the stability capital buffer, and the compliance date for the advanced approaches.” Comments on the NPRM are due 60 days after publication in the Federal Register.