Potential issuers of non-agency mortgage-backed securities looking to loosen underwriting standards on loans to be included in MBS are getting tough feedback from rating services. Fitch Ratings said last week that non-qualified mortgages with weak income documentation would likely face a “double penalty” compared with a similar non-QM that meet the documentation standards set for QMs. Non-QMs with “alternative documentation” included in non-agency MBS would ...