When shopping for an auto loan, it is important to consider not just the interest rate but also the total annual percentage rate (APR) which includes fees charged by a lender. The interest rate is often advertised by lenders, but it is important to note that it can change over time. The APR can change the cost of a loan significantly over the course of a year, so it’s vital to understand all of the fees that come with an auto loan before making a decision.