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Default Criteria & Amortizations

DefaultsFitch Ratings, one of the big three North American credit rating agencies, published its mortgage loss model today. It’s basically a bunch of formulas and assumptions that can be used for estimating losses on prime mortgages.

Fitch researched hundreds of thousands of mortgages and settled on six primary factors that drive defaults. They are (in order of significance):

  1. Borrower equity (the strongest driver of defaults)
  2. Credit score
  3. Total debt service ratio
  4. Loan purpose (purchase or refinance?)
  5. Occupancy (owner occupied or investor?)
  6. Property type (single family or multi-family)

As you may notice, amortization length was not deemed a significant factor that influences arrears. In fact, it is pretty far down the list of items causing delinquency. Yet, as we saw this week, longer amortizations still get a bad rap in regulator circles.

But how much do extended ams increase systemic risk? Is it possible that their flexibility actually reduces risk for many borrowers? This week’s column from the Globe and Mail touches on that: Would shorter amortizations make the housing market safer?


Rob McLister, CMT