A little late on my response but mortgage insurance (MI) companies are requiring a minimum of a 620 score for conventional loans these days. The monthly MI rate is determined by the loan-to-value, loan amount, type of transaction (refi vs. purchase), loan term (ARM, 15-year fixed, 30-year fixed, etc.) and credit score.
FHA's MI is still not score based. FHA charges a monthly MI rate of .5% on all loans except for in the situation where the term is 15 years or less and the loan-to-value is 90% or below... so someone taking out a 15-year fixed FHA loan at 90% LTV would not have monthly MI.
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