Your credit, your credit scores, and how wisely you shop for a loan that best fits your needs have a significant impact on your mortgage interest rate and the fees you pay. To improve your credit and your chances of getting a better mortgage, get current on your payments and stay current. About 35% of your credit scores are based on whether or not you pay your bills on time. About 30% of your credit scores are based on how much debt you owe. That's why you may want to consider paying down some of your debts.