“Many factors determine your interest rate that could explain this range in rates you’re seeing. In most cases, the advertised rates are for people with great income, little debt, and a top-notch credit score. Their interest rates are low because they’re perceived as low risk by the lender.
If you have a low credit score, limited credit history, or a high debt-to-income ratio, the lender considers you higher risk to pay back what you owe them. To counteract this risk, they increase your interest rate.
In addition, the length of your loan also dictates what your interest rate will be. It’s essentially a trade-off. The longer the loan, the higher the interest rate although your monthly payments will be lower. Conversely, a shorter loan will have a lower interest rate, but your monthly payments will be higher.”