In simple terms, the higher your credit score, the better the deal you’ll get on your mortgage. Mortgage lenders look at your score to figure out how “risky” you are as a borrower. The logic? If your credit score is solid, you’re more likely to pay back the loan, so they’ll reward you with a lower interest rate. But if your score isn’t great, they figure you’re a bit more of a gamble, so they’ll hedge their bets by offering you a higher interest rate.