Beginning Jan. 1, capital requirements for bank holdings of certain non-agency mortgage-backed securities will begin to increase. The changes were included in the Basel III reforms approved by federal banking regulators last week. The Basel III final rule includes the simplified supervisory formula approach in lieu of the use of credit ratings to determine capital requirements for holdings of non-agency MBS. The SSFA relies on the 90+ delinquency rate, risk weights of the underlying exposures ...