A credit score is a three-digit number created from information included in your credit report. While it is impossible to predict the exact impact your credit habits have on your score, you can control whether your credit score increases or decreases. Controlling your debt is the key to maintaining a positive credit rating. Paying off certain debts, however, can be harmful to your score. Repay All Debt? There are two primary types of debt impacting your credit score each month. First, installment loans are repaid in monthly installments...