Exactly just exactly How credit ratings affect mortgage prices Home loan prices and fico scores are associated. The larger your rating, the higher your price — to a spot. Fannie Mae, for example, costs its loans in tiers — 620 to 639, 640 to 659, and so forth. Therefore a debtor with a 660 FICO could easily get a better deal than one by having a 659 score. Which means increasing your FICO.. Read More