A low credit score can cause banks to charge the person higher interest rates on the loan. This is because a low credit score indicates that the person has a history of not paying their debts on time or in full. As a result, banks may view the person as a high-risk borrower and charge them higher interest rates to compensate for the increased risk. A low credit score can also make it more difficult for the person to qualify for a loan, especially if they have a poor debt-to-income ratio.