Numerous factors can affect the cost of your loan. For example, fast loans for bad credit tend to have a higher interest rate than those for excellent credit scores. Another factor contributing to the interest rate you'll get for your loan is your monthly income level and the amount you want to receive. The lower your debt-income ratio is, the better terms you'll get. So before taking any fast loans, go over your financial situation in detail to determine whether or not you'll be able to pay back your loan in time.