The Jumbo/Conforming Spread

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Standard & Poor’s issued a research report, What Drives the Variation Between Conforming and Jumbo Mortgage Rates? It opens,

What drives the variation between the conforming and jumbo mortgage rates for the 30-year fixed-rate mortgage (FRM) product offered in the U.S. residential housing market? While credit and interest rate risk are the main factors at play, S&P Global Ratings explores how these risks relate to capital market execution and whether this relationship translates into additional liquidity risk. In our study, we compare the historical spreads between the two average note rates over time, and we also examine the impact of certain loan credit characteristics. Our data indicate that the rate difference grows in periods for which the opportunity for securitization declines as a viable exit strategy for lenders. (1)

My main takeaways from the report are that (1) the decrease in securitization since the financial crisis has contributed to a wider spread between jumbo and conforming mortgages; (2) the high guaranty fee for conforming mortgages pushes down the spread¬†between jumbo and conforming mortgages; and (3) the credit box appears to be loosening a bit, which should mean that jumbos will become available to more than the “super-prime” slice of the market.