A credit score is a tool used by lenders to help determine whether you qualify for credit. Using the information on your credit report and any additional information you supplied as part of your application, lenders use a mathematical model to calculate a score that represents your credit history. This helps to indicate what kind of borrower you are, and how likely it is that you will manage your repayments. If you make all your repayments on time as per your agreement it may build your credit score and rating.